chore(main): release react-sdk 1.0.1 (#1235)

🤖 I have created a release *beep* *boop*
---


##
[1.0.1](https://github.com/open-feature/js-sdk/compare/react-sdk-v1.0.0...react-sdk-v1.0.1)
(2025-08-18)


### 🐛 Bug Fixes

* **react:** re-evaluate flags on re-render to detect silent provider …
([#1226](https://github.com/open-feature/js-sdk/issues/1226))
([3105595](3105595926))

---
This PR was generated with [Release
Please](https://github.com/googleapis/release-please). See
[documentation](https://github.com/googleapis/release-please#release-please).

Signed-off-by: OpenFeature Bot <109696520+openfeaturebot@users.noreply.github.com>

.github/workflows/audit-pending-releases.yml

@@ -29,6 +29,6 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
           registry-url: "https://registry.npmjs.org"
           cache: 'npm'

.github/workflows/coverage.yml

@@ -16,7 +16,7 @@ jobs:
       - uses: actions/setup-node@v4
         with:
           registry-url: 'https://registry.npmjs.org'
-          node-version: 18
+          node-version: 20
           cache: 'npm'
 
       - name: Install

.github/workflows/pr-checks.yaml

@@ -16,9 +16,9 @@ jobs:
     strategy:
       matrix:
         node-version:
-          - 18.x
           - 20.x
           - 22.x
+          - 24.x
 
     steps:
       - uses: actions/checkout@v4
@@ -37,8 +37,11 @@ jobs:
       - name: Lint
         run: npm run lint
 
-      - name: Test
+      - name: Test Jest Projects
-        run: npm run test
+        run: npm run test:jest
+
+      - name: Test Angular SDK
+        run: npm run test:angular
 
   codecov-and-docs:
     runs-on: ubuntu-latest
@@ -47,7 +50,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
           cache: 'npm'
 
       - name: Install
@@ -69,8 +72,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          # we need 'fetch' for this test, which is only in 18
+          node-version: 20
-          node-version: 18
           cache: 'npm'
 
       - name: Install

.github/workflows/release-please.yml

@@ -38,7 +38,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
       - name: Generate SBOM
         run: |
           npm install -g npm@^10.2.0
@@ -54,6 +54,7 @@ jobs:
     needs: release-please
     runs-on: ubuntu-latest
     if: ${{ needs.release-please.outputs.release_created }}
+    environment: publish
     permissions:
       id-token: write
       contents: write
@@ -64,7 +65,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
           registry-url: "https://registry.npmjs.org"
           cache: 'npm'
       - name: Build Packages

.release-please-manifest.json

@@ -1,9 +1,8 @@
 {
-  "packages/nest": "0.2.2",
+  "packages/nest": "0.2.5",
-  "packages/react": "0.4.10",
+  "packages/react": "1.0.1",
-  "packages/angular": "0.0.1-experimental",
+  "packages/web": "1.6.1",
-  "packages/web": "1.4.0",
+  "packages/server": "1.19.0",
-  "packages/server": "1.17.1",
+  "packages/shared": "1.9.0",
-  "packages/shared": "1.7.0",
+  "packages/angular/projects/angular-sdk": "0.0.16"
-  "packages/angular/projects/angular-sdk": "0.0.9-experimental"
 }

CODEOWNERS

@@ -3,4 +3,4 @@
 #
 # Managed by Peribolos: https://github.com/open-feature/community/blob/main/config/open-feature/sdk-javascript/workgroup.yaml
 #
-* @open-feature/sdk-javascript-maintainers
+* @open-feature/sdk-javascript-maintainers @open-feature/maintainers

jest.config.ts

@@ -161,6 +161,7 @@ export default {
       testMatch: ['<rootDir>/packages/nest/test/**/*.spec.ts'],
       moduleNameMapper: {
         '@openfeature/core': '<rootDir>/packages/shared/src',
+        '@openfeature/server-sdk': '<rootDir>/packages/server/src',
       },
       transform: {
         '^.+\\.ts$': [
@@ -189,26 +190,6 @@ export default {
         ],
       },
     },
-    {
-      displayName: 'angular',
-      testEnvironment: 'jsdom',
-      preset: 'jest-preset-angular',
-      testMatch: ['<rootDir>/packages/angular/projects/angular-sdk/src/**/*.spec.{ts,tsx}'],
-      setupFilesAfterEnv: ['<rootDir>/packages/angular/setup-jest.ts'],
-      moduleNameMapper: {
-        '@openfeature/core': '<rootDir>/packages/shared/src',
-        '@openfeature/web-sdk': '<rootDir>/packages/web/src',
-      },
-      transform: {
-        '^.+\\.(ts|js|html|svg)$': [
-          'jest-preset-angular',
-          {
-            tsconfig: '<rootDir>/packages/angular/tsconfig.json',
-            isolatedModules: true,
-          },
-        ],
-      },
-    }
   ],
 
   // Use this configuration option to add custom reporters to Jest

package.json

@@ -1,10 +1,15 @@
 {
   "name": "@openfeature/js",
+  "engines": {
+    "npm": "^10.0.0"
+  },
   "version": "0.0.0",
   "private": true,
   "description": "OpenFeature SDK for JavaScript",
   "scripts": {
-    "test": "jest --selectProjects=shared --selectProjects=server --selectProjects=web --selectProjects=react --selectProjects=angular --silent",
+    "test": "npm run test:jest && npm run test:angular",
+    "test:jest": "jest --selectProjects=shared --selectProjects=server --selectProjects=web --selectProjects=react --selectProjects=nest --silent",
+    "test:angular": "npm run test:coverage --workspace=packages/angular",
     "e2e-server": "git submodule update --init --recursive && shx cp test-harness/features/evaluation.feature packages/server/e2e/features && jest --selectProjects=server-e2e --verbose",
     "e2e-web": "git submodule update --init --recursive && shx cp test-harness/features/evaluation.feature packages/web/e2e/features && jest --selectProjects=web-e2e --verbose",
     "e2e": "npm run e2e-server && npm run e2e-web",
@@ -31,18 +36,15 @@
     "url": "https://github.com/open-feature/js-sdk/issues"
   },
   "homepage": "https://github.com/open-feature/js-sdk#readme",
-  "engines": {
-    "node": ">=18"
-  },
   "devDependencies": {
-    "@rollup/plugin-typescript": "^11.1.6",
+    "@rollup/plugin-typescript": "^12.0.0",
     "@testing-library/jest-dom": "^6.4.2",
     "@testing-library/react": "^16.0.0",
     "@types/jest": "^29.5.12",
-    "@types/node": "^20.11.16",
+    "@types/node": "^22.0.0",
     "@types/react": "^18.2.55",
     "@types/uuid": "^10.0.0",
-    "esbuild": "^0.24.0",
+    "esbuild": "^0.25.0",
     "eslint": "^8.56.0",
     "eslint-config-prettier": "^9.1.0",
     "eslint-import-resolver-alias": "^1.1.2",
@@ -57,23 +59,18 @@
     "jest-environment-jsdom": "^29.7.0",
     "jest-environment-node": "^29.7.0",
     "jest-junit": "^16.0.0",
-    "jest-preset-angular": "^14.2.4",
-    "ng-packagr": "^18.2.1",
     "prettier": "^3.2.5",
     "react": "^18.2.0",
     "rollup": "^4.0.0",
     "rollup-plugin-dts": "^6.1.1",
     "rxjs": "~7.8.0",
-    "shx": "^0.3.4",
+    "shx": "^0.4.0",
     "ts-jest": "^29.1.2",
     "ts-node": "^10.9.2",
     "tslib": "^2.3.0",
     "typedoc": "^0.26.0",
     "typescript": "^4.7.4",
-    "uuid": "^9.0.1"
+    "uuid": "^11.0.0"
-  },
-  "overrides": {
-    "typescript": "^4.7.4"
   },
   "workspaces": [
     "packages/shared",

packages/angular/angular.json

@@ -10,7 +10,7 @@
       "prefix": "lib",
       "architect": {
         "build": {
-          "builder": "@angular-devkit/build-angular:ng-packagr",
+          "builder": "@angular/build:ng-packagr",
           "options": {
             "project": "projects/angular-sdk/ng-package.json"
           },
@@ -32,6 +32,15 @@
               "projects/angular-sdk/**/*.html"
             ]
           }
+        },
+        "test": {
+          "builder": "@angular/build:unit-test",
+          "options": {
+            "tsConfig": "projects/angular-sdk/tsconfig.spec.json",
+            "providersFile": "projects/angular-sdk/src/test-provider.ts",
+            "runner": "vitest",
+            "buildTarget": "::development"
+          }
         }
       }
     }

packages/angular/package.json

@@ -7,37 +7,42 @@
     "lint": "ng lint",
     "lint:fix": "ng lint --fix",
     "watch": "ng build --watch --configuration development",
-    "test": "jest",
+    "test": "ng test",
+    "test:coverage": "ng test --no-watch --code-coverage",
     "build": "ng build && npm run postbuild",
     "postbuild": "shx cp ./../../LICENSE ./dist/angular/LICENSE",
     "publish-if-not-exists": "cp $NPM_CONFIG_USERCONFIG .npmrc && if [ \"$(npm --prefix dist/angular run current-published-version -s)\" = \"$(npm --prefix dist/angular run current-version -s)\" ]; then echo 'already published, skipping'; else cd dist/angular && npm publish --access public; fi"
   },
   "private": true,
   "devDependencies": {
-    "@angular-devkit/build-angular": "^19.0.0",
+    "@angular-eslint/builder": "^20.1.1",
-    "@angular-eslint/builder": "18.4.3",
+    "@angular-eslint/eslint-plugin": "^20.1.1",
-    "@angular-eslint/eslint-plugin": "18.4.3",
+    "@angular-eslint/eslint-plugin-template": "^20.1.1",
-    "@angular-eslint/eslint-plugin-template": "18.4.3",
+    "@angular-eslint/schematics": "^20.1.1",
-    "@angular-eslint/schematics": "18.4.3",
+    "@angular-eslint/template-parser": "^20.1.1",
-    "@angular-eslint/template-parser": "18.4.3",
+    "@angular/animations": "^20.1.1",
-    "@angular/animations": "^19.0.0",
+    "@angular/build": "^20.1.1",
-    "@angular/cli": "^19.0.0",
+    "@angular/cli": "^20.1.1",
-    "@angular/common": "^19.0.0",
+    "@angular/common": "^20.1.1",
-    "@angular/compiler": "^19.0.0",
+    "@angular/compiler": "^20.1.1",
-    "@angular/compiler-cli": "^19.0.0",
+    "@angular/compiler-cli": "^20.1.1",
-    "@angular/core": "^19.0.0",
+    "@angular/core": "^20.1.1",
-    "@angular/forms": "^19.0.0",
+    "@angular/forms": "^20.1.1",
-    "@angular/platform-browser": "^19.0.0",
+    "@angular/platform-browser": "^20.1.1",
-    "@angular/platform-browser-dynamic": "^19.0.0",
+    "@angular/platform-browser-dynamic": "^20.1.1",
-    "@angular/router": "^19.0.0",
+    "@angular/router": "^20.1.1",
     "@typescript-eslint/eslint-plugin": "7.18.0",
     "@typescript-eslint/parser": "7.18.0",
+    "@vitest/browser": "^3.2.4",
+    "@vitest/coverage-v8": "^3.2.4",
     "eslint": "^8.57.0",
-    "jest-preset-angular": "^14.2.4",
+    "jsdom": "^26.1.0",
-    "ng-packagr": "^19.0.0",
+    "ng-packagr": "^20.1.0",
+    "playwright": "^1.53.2",
     "rxjs": "~7.8.0",
     "tslib": "^2.3.0",
-    "typescript": "^5.5.4",
+    "typescript": "^5.8.3",
+    "vitest": "^3.2.4",
     "zone.js": "~0.15.0"
   }
 }

packages/angular/projects/angular-sdk/.browserslistrc

@@ -0,0 +1,18 @@
+# This file is used by the build system to adjust CSS and JS output to support the specified browsers below.
+# For additional information regarding the format and rule options, please see:
+# https://github.com/browserslist/browserslist#queries
+
+# For Angular's browser support policy, please see:
+# https://angular.dev/reference/versions#browser-support
+
+# You can see what browsers were selected by your queries by running:
+#   npx browserslist
+
+Chrome >= 107
+ChromeAndroid >= 107
+Edge >= 107
+Firefox >= 104
+FirefoxAndroid >= 104
+Safari >= 16
+iOS >= 16
+

packages/angular/projects/angular-sdk/CHANGELOG.md

@@ -1,6 +1,61 @@
 # Changelog
 
 
+## [0.0.16](https://github.com/open-feature/js-sdk/compare/angular-sdk-v0.0.15...angular-sdk-v0.0.16) (2025-07-25)
+
+
+### ✨ New Features
+
+* support Angular 20 ([#1220](https://github.com/open-feature/js-sdk/issues/1220)) ([aa232a9](https://github.com/open-feature/js-sdk/commit/aa232a9d6a8dfa416380ccdecd71843d3e361048))
+
+
+## [0.0.15](https://github.com/open-feature/js-sdk/compare/angular-sdk-v0.0.14...angular-sdk-v0.0.15) (2025-05-27)
+
+
+### 🐛 Bug Fixes
+
+* **angular:** update docs ([#1200](https://github.com/open-feature/js-sdk/issues/1200)) ([b6ea588](https://github.com/open-feature/js-sdk/commit/b6ea5884f2ab9f4f94c8b258c4cf7268ea6dbeb8))
+
+
+## [0.0.14](https://github.com/open-feature/js-sdk/compare/angular-sdk-v0.0.13...angular-sdk-v0.0.14) (2025-05-25)
+
+
+### 🐛 Bug Fixes
+
+* **angular:** add license and url field to package.json ([b2784f5](https://github.com/open-feature/js-sdk/commit/b2784f53b85a11c58abb8e2a0f87a31890885c54))
+
+
+## [0.0.13](https://github.com/open-feature/js-sdk/compare/angular-sdk-v0.0.12...angular-sdk-v0.0.13) (2025-04-20)
+
+
+### 📚 Documentation
+
+* fix readme typo ([#1174](https://github.com/open-feature/js-sdk/issues/1174)) ([21a32ec](https://github.com/open-feature/js-sdk/commit/21a32ec92ecde9ec43c9d72b5921035af13448d1))
+
+## [0.0.12](https://github.com/open-feature/js-sdk/compare/angular-sdk-v0.0.11...angular-sdk-v0.0.12) (2025-04-11)
+
+
+### ✨ New Features
+
+* **angular:** add docs for setting evaluation context in angular ([#1170](https://github.com/open-feature/js-sdk/issues/1170)) ([24f1b23](https://github.com/open-feature/js-sdk/commit/24f1b230bf1d57971a336ac21b9ee46e8baf0cab))
+
+
+## [0.0.11](https://github.com/open-feature/js-sdk/compare/angular-sdk-v0.0.10...angular-sdk-v0.0.11) (2025-04-11)
+
+
+### ✨ New Features
+
+* **angular:** add option for initial context injection ([aafdb43](https://github.com/open-feature/js-sdk/commit/aafdb4382f113f96a649f5fc0cecadb4178ada67))
+  
+
+## [0.0.10](https://github.com/open-feature/js-sdk/compare/angular-sdk-v0.0.9-experimental...angular-sdk-v0.0.10) (2025-02-13)
+
+
+### 🧹 Chore
+
+* **angular:** update angular package to a non-experimental version ([#1147](https://github.com/open-feature/js-sdk/issues/1147)) ([5272f76](https://github.com/open-feature/js-sdk/commit/5272f76c4075ebbd21f9b24dacac8f2d22e31ca9)), closes [#1110](https://github.com/open-feature/js-sdk/issues/1110)
+* update sdk peer ([#1142](https://github.com/open-feature/js-sdk/issues/1142)) ([8bb6206](https://github.com/open-feature/js-sdk/commit/8bb620601e2b8dc7b62d717169b585bd1c886996))
+
 ## [0.0.9-experimental](https://github.com/open-feature/js-sdk/compare/angular-sdk-v0.0.8-experimental...angular-sdk-v0.0.9-experimental) (2024-11-21)
 
 

packages/angular/projects/angular-sdk/README.md

@@ -16,8 +16,8 @@
     <img alt="Specification" src="https://img.shields.io/static/v1?label=specification&message=v0.8.0&color=yellow&style=for-the-badge" />
   </a>
   <!-- x-release-please-start-version -->
-  <a href="https://github.com/open-feature/js-sdk/releases/tag/angular-sdk-v0.0.9-experimental">
+  <a href="https://github.com/open-feature/js-sdk/releases/tag/angular-sdk-v0.0.16">
-    <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v0.0.9-experimental&color=blue&style=for-the-badge" />
+    <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v0.0.16&color=blue&style=for-the-badge" />
   </a>
   <!-- x-release-please-end -->
   <br/>
@@ -44,21 +44,22 @@ In addition to the features provided by the [web sdk](https://openfeature.dev/do
 
 - [Overview](#overview)
 - [Quick start](#quick-start)
-  - [Requirements](#requirements)
+    - [Requirements](#requirements)
-  - [Install](#install)
+    - [Install](#install)
-    - [npm](#npm)
+        - [npm](#npm)
-    - [yarn](#yarn)
+        - [yarn](#yarn)
-    - [Required peer dependencies](#required-peer-dependencies)
+        - [Required peer dependencies](#required-peer-dependencies)
-  - [Usage](#usage)
+    - [Usage](#usage)
-    - [Module](#module)
+        - [Module](#module)
-      - [Minimal Example](#minimal-example)
+            - [Minimal Example](#minimal-example)
-    - [How to use](#how-to-use)
+        - [How to use](#how-to-use)
-      - [Boolean Feature Flag](#boolean-feature-flag)
+            - [Boolean Feature Flag](#boolean-feature-flag)
-      - [Number Feature Flag](#number-feature-flag)
+            - [Number Feature Flag](#number-feature-flag)
-      - [String Feature Flag](#string-feature-flag)
+            - [String Feature Flag](#string-feature-flag)
-      - [Object Feature Flag](#object-feature-flag)
+            - [Object Feature Flag](#object-feature-flag)
-      - [Opting-out of automatic re-rendering](#opting-out-of-automatic-re-rendering)
+            - [Opting-out of automatic re-rendering](#opting-out-of-automatic-re-rendering)
-      - [Consuming the evaluation details](#consuming-the-evaluation-details)
+            - [Consuming the evaluation details](#consuming-the-evaluation-details)
+            - [Setting Evaluation Context](#setting-evaluation-context)
 - [FAQ and troubleshooting](#faq-and-troubleshooting)
 - [Resources](#resources)
 
@@ -113,7 +114,7 @@ import { OpenFeatureModule } from '@openfeature/angular-sdk';
     CommonModule,
     OpenFeatureModule.forRoot({
       provider: yourFeatureProvider,
-      // domainBoundProviders are optional, mostly needed if more than one provider is needed
+      // domainBoundProviders are optional, mostly needed if more than one provider is used in the application.
       domainBoundProviders: {
         domain1: new YourOpenFeatureProvider(),
         domain2: new YourOtherOpenFeatureProvider(),
@@ -281,6 +282,63 @@ This can be used to just render the flag value or details without conditional re
 </div>
 ```
 
+##### Setting evaluation context
+
+To set the initial evaluation context, you can add the `context` parameter to the `OpenFeatureModule` configuration.
+This context can be either an object or a factory function that returns an `EvaluationContext`.
+
+> [!TIP]
+> Updating the context can be done directly via the global OpenFeature API using `OpenFeature.setContext()`
+
+Here’s how you can define and use the initial client evaluation context:
+
+###### Using a static object
+
+```typescript
+import { NgModule } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { OpenFeatureModule } from '@openfeature/angular-sdk';
+
+const initialContext = {
+  user: {
+    id: 'user123',
+    role: 'admin',
+  }
+};
+
+@NgModule({
+  imports: [
+    CommonModule,
+    OpenFeatureModule.forRoot({
+      provider: yourFeatureProvider,
+      context: initialContext
+    })
+  ],
+})
+export class AppModule {}
+```
+
+###### Using a factory function
+
+```typescript
+import { NgModule } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { OpenFeatureModule, EvaluationContext } from '@openfeature/angular-sdk';
+
+const contextFactory = (): EvaluationContext => loadContextFromLocalStorage();
+
+@NgModule({
+  imports: [
+    CommonModule,
+    OpenFeatureModule.forRoot({
+      provider: yourFeatureProvider,
+      context: contextFactory
+    })
+  ],
+})
+export class AppModule {}
+```
+
 ## FAQ and troubleshooting
 
 > I can import things form the `@openfeature/angular-sdk`, `@openfeature/web-sdk`, and `@openfeature/core`; which should I use?
@@ -291,4 +349,4 @@ Avoid importing anything from `@openfeature/web-sdk` or `@openfeature/core`.
 
 ## Resources
 
- - [Example repo](https://github.com/open-feature/angular-test-app)
+- [Example repo](https://github.com/open-feature/angular-test-app)

packages/angular/projects/angular-sdk/package.json

@@ -1,29 +1,34 @@
 {
   "name": "@openfeature/angular-sdk",
-  "version": "0.0.9-experimental",
+  "version": "0.0.16",
   "description": "OpenFeature Angular SDK",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/open-feature/js-sdk.git"
   },
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/open-feature/js-sdk/issues"
+  },
+  "homepage": "https://github.com/open-feature/js-sdk#readme",
   "scripts": {
     "current-published-version": "npm show $npm_package_name@$npm_package_version version",
     "current-version": "echo $npm_package_version",
     "prepack": "shx cp ./../../../../LICENSE ./LICENSE"
   },
   "peerDependencies": {
-    "@angular/common": "^16.2.12 || ^17.3.0 || ^18.0.0 || ^19.0.0",
+    "@angular/common": "^16.2.12 || ^17.3.0 || ^18.0.0 || ^19.0.0 || ^20.0.0",
-    "@angular/core": "^16.2.12 || ^17.3.0 || ^18.0.0 || ^19.0.0",
+    "@angular/core": "^16.2.12 || ^17.3.0 || ^18.0.0 || ^19.0.0 || ^20.0.0",
-    "@openfeature/web-sdk": "^1.2.3"
+    "@openfeature/web-sdk": "^1.4.1"
   },
   "dependencies": {
     "tslib": "^2.3.0"
   },
   "devDependencies": {
-    "@openfeature/core": "*",
+    "@openfeature/core": "^1.8.1",
-    "@openfeature/web-sdk": "*",
+    "@openfeature/web-sdk": "^1.5.0",
-    "@angular/common": "^19.0.0",
+    "@angular/common": "^20.1.2",
-    "@angular/core": "^19.0.0"
+    "@angular/core": "^20.1.2"
   },
   "sideEffects": false,
   "keywords": [

packages/angular/projects/angular-sdk/src/lib/feature-flag.directive.spec.ts

@@ -253,6 +253,7 @@ describe('FeatureFlagDirective', () => {
       await expectRenderedText(fixture, 'case-2', 'Flag On');
 
       await updateFlagValue(provider, false);
+      fixture.detectChanges(); // Ensure change detection after flag update
       await expectRenderedText(fixture, 'case-2', 'Flag Off');
     });
   });
@@ -393,7 +394,9 @@ describe('FeatureFlagDirective', () => {
       await waitForClientReady(client);
       await expectRenderedText(fixture, 'case-6', 'Flag On');
 
-      fixture.componentInstance.specialFlagKey = 'new-test-flag';
+      fixture.componentRef.setInput('specialFlagKey', 'new-test-flag');
+      await fixture.whenStable();
+
       await expectRenderedText(fixture, 'case-6', 'Flag Off');
     });
 
@@ -445,7 +448,9 @@ describe('FeatureFlagDirective', () => {
       );
       await OpenFeature.setProviderAndWait(newDomain, newProvider);
 
-      fixture.componentInstance.domain = newDomain;
+      fixture.componentRef.setInput('domain', newDomain);
+      await fixture.whenStable();
+
       await expectRenderedText(fixture, 'case-6', 'Flag Off');
     });
   });
@@ -560,8 +565,7 @@ async function createTestingModule(config?: {
     ],
   }).createComponent(TestComponent);
 
-  fixture.componentInstance.domain = domain;
+  fixture.componentRef.setInput('domain', domain);
-  fixture.detectChanges();
   await fixture.whenStable();
 
   const client = OpenFeature.getClient(domain);

packages/angular/projects/angular-sdk/src/lib/feature-flag.directive.ts

@@ -8,6 +8,7 @@ import {
   OnInit,
   TemplateRef,
   ViewContainerRef,
+  inject,
 } from '@angular/core';
 import {
   Client,
@@ -35,6 +36,9 @@ class FeatureFlagDirectiveContext<T extends FlagValue> {
   selector: '[featureFlag]',
 })
 export abstract class FeatureFlagDirective<T extends FlagValue> implements OnInit, OnDestroy, OnChanges {
+  protected _changeDetectorRef: ChangeDetectorRef;
+  protected _viewContainerRef: ViewContainerRef;
+
   protected _featureFlagDefault: T;
   protected _featureFlagDomain: string | undefined;
 
@@ -64,13 +68,7 @@ export abstract class FeatureFlagDirective<T extends FlagValue> implements OnIni
   protected _reconcilingTemplateRef: TemplateRef<FeatureFlagDirectiveContext<T>> | null;
   protected _reconcilingViewRef: EmbeddedViewRef<unknown> | null;
 
-  protected constructor(
+  protected constructor() {}
-    protected _changeDetectorRef: ChangeDetectorRef,
-    protected _viewContainerRef: ViewContainerRef,
-    templateRef: TemplateRef<FeatureFlagDirectiveContext<T>>,
-  ) {
-    this._thenTemplateRef = templateRef;
-  }
 
   set featureFlagDomain(domain: string | undefined) {
     /**
@@ -232,6 +230,10 @@ export abstract class FeatureFlagDirective<T extends FlagValue> implements OnIni
   selector: '[booleanFeatureFlag]',
 })
 export class BooleanFeatureFlagDirective extends FeatureFlagDirective<boolean> implements OnChanges {
+  override _changeDetectorRef = inject(ChangeDetectorRef);
+  override _viewContainerRef = inject(ViewContainerRef);
+  override _thenTemplateRef = inject<TemplateRef<FeatureFlagDirectiveContext<boolean>>>(TemplateRef);
+
   /**
    * The key of the boolean feature flag.
    */
@@ -242,12 +244,8 @@ export class BooleanFeatureFlagDirective extends FeatureFlagDirective<boolean> i
    */
   @Input({ required: true }) booleanFeatureFlagDefault: boolean;
 
-  constructor(
+  constructor() {
-    _changeDetectorRef: ChangeDetectorRef,
+    super();
-    _viewContainerRef: ViewContainerRef,
-    templateRef: TemplateRef<FeatureFlagDirectiveContext<boolean>>,
-  ) {
-    super(_changeDetectorRef, _viewContainerRef, templateRef);
   }
 
   override ngOnChanges() {
@@ -347,6 +345,10 @@ export class BooleanFeatureFlagDirective extends FeatureFlagDirective<boolean> i
   selector: '[numberFeatureFlag]',
 })
 export class NumberFeatureFlagDirective extends FeatureFlagDirective<number> implements OnChanges {
+  override _changeDetectorRef = inject(ChangeDetectorRef);
+  override _viewContainerRef = inject(ViewContainerRef);
+  override _thenTemplateRef = inject<TemplateRef<FeatureFlagDirectiveContext<number>>>(TemplateRef);
+
   /**
    * The key of the number feature flag.
    */
@@ -362,12 +364,8 @@ export class NumberFeatureFlagDirective extends FeatureFlagDirective<number> imp
    */
   @Input({ required: false }) numberFeatureFlagValue?: number;
 
-  constructor(
+  constructor() {
-    _changeDetectorRef: ChangeDetectorRef,
+    super();
-    _viewContainerRef: ViewContainerRef,
-    templateRef: TemplateRef<FeatureFlagDirectiveContext<number>>,
-  ) {
-    super(_changeDetectorRef, _viewContainerRef, templateRef);
   }
 
   override ngOnChanges() {
@@ -467,6 +465,10 @@ export class NumberFeatureFlagDirective extends FeatureFlagDirective<number> imp
   selector: '[stringFeatureFlag]',
 })
 export class StringFeatureFlagDirective extends FeatureFlagDirective<string> implements OnChanges {
+  override _changeDetectorRef = inject(ChangeDetectorRef);
+  override _viewContainerRef = inject(ViewContainerRef);
+  override _thenTemplateRef = inject<TemplateRef<FeatureFlagDirectiveContext<string>>>(TemplateRef);
+
   /**
    * The key of the string feature flag.
    */
@@ -482,12 +484,8 @@ export class StringFeatureFlagDirective extends FeatureFlagDirective<string> imp
    */
   @Input({ required: false }) stringFeatureFlagValue?: string;
 
-  constructor(
+  constructor() {
-    _changeDetectorRef: ChangeDetectorRef,
+    super();
-    _viewContainerRef: ViewContainerRef,
-    templateRef: TemplateRef<FeatureFlagDirectiveContext<string>>,
-  ) {
-    super(_changeDetectorRef, _viewContainerRef, templateRef);
   }
 
   override ngOnChanges() {
@@ -587,6 +585,10 @@ export class StringFeatureFlagDirective extends FeatureFlagDirective<string> imp
   selector: '[objectFeatureFlag]',
 })
 export class ObjectFeatureFlagDirective<T extends JsonValue> extends FeatureFlagDirective<T> implements OnChanges {
+  override _changeDetectorRef = inject(ChangeDetectorRef);
+  override _viewContainerRef = inject(ViewContainerRef);
+  override _thenTemplateRef = inject<TemplateRef<FeatureFlagDirectiveContext<T>>>(TemplateRef);
+
   /**
    * The key of the object feature flag.
    */
@@ -602,12 +604,8 @@ export class ObjectFeatureFlagDirective<T extends JsonValue> extends FeatureFlag
    */
   @Input({ required: false }) objectFeatureFlagValue?: T;
 
-  constructor(
+  constructor() {
-    _changeDetectorRef: ChangeDetectorRef,
+    super();
-    _viewContainerRef: ViewContainerRef,
-    templateRef: TemplateRef<FeatureFlagDirectiveContext<T>>,
-  ) {
-    super(_changeDetectorRef, _viewContainerRef, templateRef);
   }
 
   override ngOnChanges() {

packages/angular/projects/angular-sdk/src/lib/open-feature.module.ts

@@ -1,10 +1,13 @@
 import { InjectionToken, ModuleWithProviders, NgModule } from '@angular/core';
 import { CommonModule } from '@angular/common';
-import { OpenFeature, Provider } from '@openfeature/web-sdk';
+import { EvaluationContext, OpenFeature, Provider } from '@openfeature/web-sdk';
+
+export type EvaluationContextFactory = () => EvaluationContext;
 
 export interface OpenFeatureConfig {
   provider: Provider;
   domainBoundProviders?: Record<string, Provider>;
+  context?: EvaluationContext | EvaluationContextFactory;
 }
 
 export const OPEN_FEATURE_CONFIG_TOKEN = new InjectionToken<OpenFeatureConfig>('OPEN_FEATURE_CONFIG_TOKEN');
@@ -16,7 +19,9 @@ export const OPEN_FEATURE_CONFIG_TOKEN = new InjectionToken<OpenFeatureConfig>('
 })
 export class OpenFeatureModule {
   static forRoot(config: OpenFeatureConfig): ModuleWithProviders<OpenFeatureModule> {
-    OpenFeature.setProvider(config.provider);
+    const context = typeof config.context === 'function' ? config.context() : config.context;
+    OpenFeature.setProvider(config.provider, context);
+
     if (config.domainBoundProviders) {
       Object.entries(config.domainBoundProviders).map(([domain, provider]) =>
         OpenFeature.setProvider(domain, provider),

packages/angular/projects/angular-sdk/src/test-provider.ts

@@ -0,0 +1,3 @@
+import { provideZonelessChangeDetection } from '@angular/core';
+
+export default [provideZonelessChangeDetection()];

packages/angular/projects/angular-sdk/tsconfig.spec.json

@@ -3,15 +3,20 @@
   "compilerOptions": {
     "outDir": "./out-tsc/spec",
     "types": [
-      "jest",
+      "vitest/globals",
       "node"
     ],
+    "paths": {
+      "angular": [
+        "./dist/angular"
+      ]
+    },
     "esModuleInterop": true,
     "emitDecoratorMetadata": true
   },
   "include": [
     "src/**/*.spec.ts",
     "src/**/*.d.ts",
-    "setup-jest.ts"
+    "src/test-provider.ts"
   ]
 }

packages/angular/setup-jest.ts

@@ -1,5 +0,0 @@
-import 'jest-preset-angular/setup-jest';
-import { TestBed } from '@angular/core/testing';
-import { BrowserDynamicTestingModule, platformBrowserDynamicTesting } from '@angular/platform-browser-dynamic/testing';
-
-TestBed.initTestEnvironment(BrowserDynamicTestingModule, platformBrowserDynamicTesting());

packages/angular/tsconfig.json

@@ -23,8 +23,8 @@
     "experimentalDecorators": true,
     "moduleResolution": "node",
     "importHelpers": true,
-    "target": "ES2015",
+    "target": "ES2022",
-    "module": "ES2015",
+    "module": "ES2022",
     "useDefineForClassFields": false,
     "strictNullChecks": false,
     "lib": [

packages/angular/tsconfig.spec.json

@@ -3,13 +3,14 @@
   "compilerOptions": {
     "outDir": "./out-tsc/spec",
     "types": [
-      "jest"
+      "vitest/globals",
+      "node"
     ],
     "esModuleInterop": true,
     "emitDecoratorMetadata": true
   },
   "include": [
-    "src/**/*.spec.ts",
+    "projects/angular-sdk/src/**/*.spec.ts",
-    "src/**/*.d.ts"
+    "projects/angular-sdk/src/**/*.d.ts"
   ]
 }

packages/angular/vitest.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'html'],
+    },
+  },
+});

packages/nest/CHANGELOG.md

@@ -1,5 +1,34 @@
 # Changelog
 
+## [0.2.5](https://github.com/open-feature/js-sdk/compare/nestjs-sdk-v0.2.4...nestjs-sdk-v0.2.5) (2025-05-27)
+
+
+### ✨ New Features
+
+* adds RequireFlagsEnabled decorator ([#1159](https://github.com/open-feature/js-sdk/issues/1159)) ([59b8fe9](https://github.com/open-feature/js-sdk/commit/59b8fe904f053e4aa3d0c72631af34183ff54dc7))
+
+
+## [0.2.4](https://github.com/open-feature/js-sdk/compare/nestjs-sdk-v0.2.3...nestjs-sdk-v0.2.4) (2025-04-20)
+
+
+### 🧹 Chore
+
+* **nest:** allow nestjs version 11 ([#1176](https://github.com/open-feature/js-sdk/issues/1176)) ([42a3b39](https://github.com/open-feature/js-sdk/commit/42a3b39c2488002f249b37ce86794ef2f77eb31c))
+
+## [0.2.3](https://github.com/open-feature/js-sdk/compare/nestjs-sdk-v0.2.2...nestjs-sdk-v0.2.3) (2025-04-11)
+
+
+### 🧹 Chore
+
+* update sdk peer ([#1142](https://github.com/open-feature/js-sdk/issues/1142)) ([8bb6206](https://github.com/open-feature/js-sdk/commit/8bb620601e2b8dc7b62d717169b585bd1c886996))
+
+
+### Dependencies
+
+* The following workspace dependencies were updated
+  * devDependencies
+    * @openfeature/server-sdk bumped from * to 1.18.0
+
 ## [0.2.2](https://github.com/open-feature/js-sdk/compare/nestjs-sdk-v0.2.1-experimental...nestjs-sdk-v0.2.2) (2024-10-29)
 
 

packages/nest/README.md

@@ -16,8 +16,8 @@
     <img alt="Specification" src="https://img.shields.io/static/v1?label=specification&message=v0.8.0&color=yellow&style=for-the-badge" />
   </a>
   <!-- x-release-please-start-version -->
-  <a href="https://github.com/open-feature/js-sdk/releases/tag/nestjs-sdk-v0.2.2">
+  <a href="https://github.com/open-feature/js-sdk/releases/tag/nestjs-sdk-v0.2.5">
-    <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v0.2.2&color=blue&style=for-the-badge" />
+    <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v0.2.5&color=blue&style=for-the-badge" />
   </a>
   <!-- x-release-please-end -->
   <br/>
@@ -50,7 +50,7 @@ Capabilities include:
 
 ### Requirements
 
-- Node.js version 18+
+- Node.js version 20+
 - NestJS version 8+
 
 ### Install
@@ -72,10 +72,10 @@ yarn add @openfeature/nestjs-sdk @openfeature/server-sdk @openfeature/core
 
 The following list contains the peer dependencies of `@openfeature/nestjs-sdk` with its expected and compatible versions:
 
-* `@openfeature/server-sdk`: >=1.7.5
+- `@openfeature/server-sdk`: >=1.7.5
-* `@nestjs/common`: ^8.0.0 || ^9.0.0 || ^10.0.0
+- `@nestjs/common`: ^8.0.0 || ^9.0.0 || ^10.0.0 || ^11.0.0
-* `@nestjs/core`: ^8.0.0 || ^9.0.0 || ^10.0.0
+- `@nestjs/core`: ^8.0.0 || ^9.0.0 || ^10.0.0 || ^11.0.0
-* `rxjs`: ^6.0.0 || ^7.0.0 || ^8.0.0
+- `rxjs`: ^6.0.0 || ^7.0.0 || ^8.0.0
 
 The minimum required version of `@openfeature/server-sdk` currently is `1.7.5`.
 
@@ -152,6 +152,24 @@ export class OpenFeatureTestService {
 }
 ```
 
+#### Managing Controller or Route Access via Feature Flags
+
+The `RequireFlagsEnabled` decorator can be used to manage access to a controller or route based on the enabled state of a feature flag. The decorator will throw an exception if the required feature flag(s) are not enabled.
+
+```ts
+import { Controller, Get } from '@nestjs/common';
+import { RequireFlagsEnabled } from '@openfeature/nestjs-sdk';
+
+@Controller()
+export class OpenFeatureController {
+  @RequireFlagsEnabled({ flags: [{ flagKey: 'testBooleanFlag' }] })
+  @Get('/welcome')
+  public async welcome() {
+    return 'Welcome to this OpenFeature-enabled NestJS app!';
+  }
+}
+```
+
 ## Module additional information
 
 ### Flag evaluation context injection

packages/nest/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openfeature/nestjs-sdk",
-  "version": "0.2.2",
+  "version": "0.2.5",
   "description": "OpenFeature Nest.js SDK",
   "main": "./dist/cjs/index.js",
   "files": [
@@ -46,18 +46,18 @@
   },
   "homepage": "https://github.com/open-feature/js-sdk#readme",
   "peerDependencies": {
-    "@nestjs/common": "^8.0.0 || ^9.0.0 || ^10.0.0",
+    "@nestjs/common": "^8.0.0 || ^9.0.0 || ^10.0.0 || ^11.0.0",
-    "@nestjs/core": "^8.0.0 || ^9.0.0 || ^10.0.0",
+    "@nestjs/core": "^8.0.0 || ^9.0.0 || ^10.0.0 || ^11.0.0",
     "rxjs": "^6.0.0 || ^7.0.0 || 8.0.0",
-    "@openfeature/server-sdk": ">=1.14.0"
+    "@openfeature/server-sdk": "^1.17.1"
   },
   "devDependencies": {
-    "@nestjs/common": "^10.3.6",
+    "@nestjs/common": "^11.0.20",
-    "@nestjs/core": "^10.3.6",
+    "@nestjs/core": "^11.0.20",
-    "@nestjs/platform-express": "^10.3.6",
+    "@nestjs/platform-express": "^11.0.20",
-    "@nestjs/testing": "^10.3.6",
+    "@nestjs/testing": "^11.0.20",
     "@openfeature/core": "*",
-    "@openfeature/server-sdk": "*",
+    "@openfeature/server-sdk": "1.18.0",
     "@types/supertest": "^6.0.0",
     "supertest": "^7.0.0"
   }

packages/nest/src/feature.decorator.ts

@@ -1,16 +1,10 @@
 import { createParamDecorator, Inject } from '@nestjs/common';
-import type {
+import type { EvaluationContext, EvaluationDetails, FlagValue, JsonValue } from '@openfeature/server-sdk';
-  EvaluationContext,
+import { Client } from '@openfeature/server-sdk';
-  EvaluationDetails,
-  FlagValue,
-  JsonValue} from '@openfeature/server-sdk';
-import {
-  OpenFeature,
-  Client,
-} from '@openfeature/server-sdk';
 import { getOpenFeatureClientToken } from './open-feature.module';
 import type { Observable } from 'rxjs';
 import { from } from 'rxjs';
+import { getClientForEvaluation } from './utils';
 
 /**
  * Options for injecting an OpenFeature client into a constructor.
@@ -56,16 +50,6 @@ interface FeatureProps<T extends FlagValue> {
   context?: EvaluationContext;
 }
 
-/**
- * Returns a domain scoped or the default OpenFeature client with the given context.
- * @param {string} domain The domain of the OpenFeature client.
- * @param {EvaluationContext} context The evaluation context of the client.
- * @returns {Client} The OpenFeature client.
- */
-function getClientForEvaluation(domain?: string, context?: EvaluationContext) {
-  return domain ? OpenFeature.getClient(domain, context) : OpenFeature.getClient(context);
-}
-
 /**
  * Route handler parameter decorator.
  *

packages/nest/src/index.ts

@@ -2,5 +2,6 @@ export * from './open-feature.module';
 export * from './feature.decorator';
 export * from './evaluation-context-interceptor';
 export * from './context-factory';
+export * from './require-flags-enabled.decorator';
 // re-export the server-sdk so consumers can access that API from the nestjs-sdk
 export * from '@openfeature/server-sdk';

packages/nest/src/require-flags-enabled.decorator.ts

@@ -0,0 +1,104 @@
+import type { CallHandler, ExecutionContext, HttpException, NestInterceptor } from '@nestjs/common';
+import { applyDecorators, mixin, NotFoundException, UseInterceptors } from '@nestjs/common';
+import { getClientForEvaluation } from './utils';
+import type { EvaluationContext } from '@openfeature/server-sdk';
+import type { ContextFactory } from './context-factory';
+
+type RequiredFlag = {
+  flagKey: string;
+  defaultValue?: boolean;
+};
+
+/**
+ * Options for using one or more Boolean feature flags to control access to a Controller or Route.
+ */
+interface RequireFlagsEnabledProps {
+  /**
+   * The key and default value of the feature flag.
+   * @see {@link Client#getBooleanValue}
+   */
+  flags: RequiredFlag[];
+
+  /**
+   * The exception to throw if any of the required feature flags are not enabled.
+   * Defaults to a 404 Not Found exception.
+   * @see {@link HttpException}
+   * @default new NotFoundException(`Cannot ${req.method} ${req.url}`)
+   */
+  exception?: HttpException;
+
+  /**
+   * The domain of the OpenFeature client, if a domain scoped client should be used.
+   * @see {@link OpenFeature#getClient}
+   */
+  domain?: string;
+
+  /**
+   * The {@link EvaluationContext} for evaluating the feature flag.
+   * @see {@link OpenFeature#setContext}
+   */
+  context?: EvaluationContext;
+
+  /**
+   * A factory function for creating an OpenFeature {@link EvaluationContext} from Nest {@link ExecutionContext}.
+   * For example, this can be used to get header info from an HTTP request or information from a gRPC call to be used in the {@link EvaluationContext}.
+   * @see {@link ContextFactory}
+   */
+  contextFactory?: ContextFactory;
+}
+
+/**
+ * Controller or Route permissions handler decorator.
+ *
+ * Requires that the given feature flags are enabled for the request to be processed, else throws an exception.
+ *
+ * For example:
+ * ```typescript
+ * @RequireFlagsEnabled({
+ *   flags: [                               // Required, an array of Boolean flags to check, with optional default values (defaults to false)
+ *     { flagKey: 'flagName' },
+ *     { flagKey: 'flagName2', defaultValue: true },
+ *   ],
+ *   exception: new ForbiddenException(),   // Optional, defaults to a 404 Not Found Exception
+ *   domain: 'my-domain',                   // Optional, defaults to the default OpenFeature Client
+ *   context: {                             // Optional, defaults to the global OpenFeature Context
+ *     targetingKey: 'user-id',
+ *   },
+ *   contextFactory: (context: ExecutionContext) => {  // Optional, defaults to the global OpenFeature Context. Takes precedence over the context option.
+ *     return {
+ *       targetingKey: context.switchToHttp().getRequest().headers['x-user-id'],
+ *     };
+ *   },
+ * })
+ * @Get('/')
+ * public async handleGetRequest()
+ * ```
+ * @param {RequireFlagsEnabledProps} props The options for injecting the feature flag.
+ * @returns {ClassDecorator & MethodDecorator} The decorator that can be used to require Boolean Feature Flags to be enabled for a controller or a specific route.
+ */
+export const RequireFlagsEnabled = (props: RequireFlagsEnabledProps): ClassDecorator & MethodDecorator =>
+  applyDecorators(UseInterceptors(FlagsEnabledInterceptor(props)));
+
+const FlagsEnabledInterceptor = (props: RequireFlagsEnabledProps) => {
+  class FlagsEnabledInterceptor implements NestInterceptor {
+    constructor() {}
+
+    async intercept(context: ExecutionContext, next: CallHandler) {
+      const req = context.switchToHttp().getRequest();
+      const evaluationContext = props.contextFactory ? await props.contextFactory(context) : props.context;
+      const client = getClientForEvaluation(props.domain, evaluationContext);
+
+      for (const flag of props.flags) {
+        const endpointAccessible = await client.getBooleanValue(flag.flagKey, flag.defaultValue ?? false);
+
+        if (!endpointAccessible) {
+          throw props.exception || new NotFoundException(`Cannot ${req.method} ${req.url}`);
+        }
+      }
+
+      return next.handle();
+    }
+  }
+
+  return mixin(FlagsEnabledInterceptor);
+};

packages/nest/src/utils.ts

@@ -0,0 +1,12 @@
+import type { Client, EvaluationContext } from '@openfeature/server-sdk';
+import { OpenFeature } from '@openfeature/server-sdk';
+
+/**
+ * Returns a domain scoped or the default OpenFeature client with the given context.
+ * @param {string} domain The domain of the OpenFeature client.
+ * @param {EvaluationContext} context The evaluation context of the client.
+ * @returns {Client} The OpenFeature client.
+ */
+export function getClientForEvaluation(domain?: string, context?: EvaluationContext) {
+  return domain ? OpenFeature.getClient(domain, context) : OpenFeature.getClient(context);
+}

packages/nest/test/fixtures.ts

@@ -1,4 +1,5 @@
 import { InMemoryProvider } from '@openfeature/server-sdk';
+import type { EvaluationContext } from '@openfeature/server-sdk';
 import type { ExecutionContext } from '@nestjs/common';
 import { OpenFeatureModule } from '../src';
 
@@ -23,6 +24,17 @@ export const defaultProvider = new InMemoryProvider({
     variants: { default: { client: 'default' } },
     disabled: false,
   },
+  testBooleanFlag2: {
+    defaultVariant: 'default',
+    variants: { default: false, enabled: true },
+    disabled: false,
+    contextEvaluator: (ctx: EvaluationContext) => {
+      if (ctx.targetingKey === '123') {
+        return 'enabled';
+      }
+      return 'default';
+    },
+  },
 });
 
 export const providers = {

packages/nest/test/open-feature-sdk.spec.ts

@@ -2,7 +2,12 @@ import type { TestingModule } from '@nestjs/testing';
 import { Test } from '@nestjs/testing';
 import type { INestApplication } from '@nestjs/common';
 import supertest from 'supertest';
-import { OpenFeatureController, OpenFeatureControllerContextScopedController, OpenFeatureTestService } from './test-app';
+import {
+  OpenFeatureController,
+  OpenFeatureContextScopedController,
+  OpenFeatureRequireFlagsEnabledController,
+  OpenFeatureTestService,
+} from './test-app';
 import { exampleContextFactory, getOpenFeatureDefaultTestModule } from './fixtures';
 import { OpenFeatureModule } from '../src';
 import { defaultProvider, providers } from './fixtures';
@@ -14,11 +19,9 @@ describe('OpenFeature SDK', () => {
 
     beforeAll(async () => {
       moduleRef = await Test.createTestingModule({
-        imports: [
+        imports: [getOpenFeatureDefaultTestModule()],
-          getOpenFeatureDefaultTestModule()
-        ],
         providers: [OpenFeatureTestService],
-        controllers: [OpenFeatureController],
+        controllers: [OpenFeatureController, OpenFeatureRequireFlagsEnabledController],
       }).compile();
       app = moduleRef.createNestApplication();
       app = await app.init();
@@ -112,7 +115,7 @@ describe('OpenFeature SDK', () => {
     });
 
     describe('evaluation context service should', () => {
-      it('inject the evaluation context from contex factory', async function() {
+      it('inject the evaluation context from contex factory', async function () {
         const evaluationSpy = jest.spyOn(defaultProvider, 'resolveBooleanEvaluation');
         await supertest(app.getHttpServer())
           .get('/dynamic-context-in-service')
@@ -122,26 +125,77 @@ describe('OpenFeature SDK', () => {
         expect(evaluationSpy).toHaveBeenCalledWith('testBooleanFlag', false, { targetingKey: 'dynamic-user' }, {});
       });
     });
+
+    describe('require flags enabled decorator', () => {
+      describe('OpenFeatureController', () => {
+        it('should sucessfully return the response if the flag is enabled', async () => {
+          await supertest(app.getHttpServer()).get('/flags-enabled').expect(200).expect('Get Boolean Flag Success!');
+        });
+
+        it('should throw an exception if the flag is disabled', async () => {
+          jest.spyOn(defaultProvider, 'resolveBooleanEvaluation').mockResolvedValueOnce({
+            value: false,
+            reason: 'DISABLED',
+          });
+          await supertest(app.getHttpServer()).get('/flags-enabled').expect(404);
+        });
+
+        it('should throw a custom exception if the flag is disabled', async () => {
+          jest.spyOn(defaultProvider, 'resolveBooleanEvaluation').mockResolvedValueOnce({
+            value: false,
+            reason: 'DISABLED',
+          });
+          await supertest(app.getHttpServer()).get('/flags-enabled-custom-exception').expect(403);
+        });
+
+        it('should throw a custom exception if the flag is disabled with context', async () => {
+          await supertest(app.getHttpServer())
+            .get('/flags-enabled-custom-exception-with-context')
+            .set('x-user-id', '123')
+            .expect(403);
+        });
+      });
+
+      describe('OpenFeatureControllerRequireFlagsEnabled', () => {
+        it('should allow access to the RequireFlagsEnabled controller with global context interceptor', async () => {
+          await supertest(app.getHttpServer())
+            .get('/require-flags-enabled')
+            .set('x-user-id', '123')
+            .expect(200)
+            .expect('Hello, world!');
+        });
+
+        it('should throw a 403 - Forbidden exception if user does not match targeting requirements', async () => {
+          await supertest(app.getHttpServer()).get('/require-flags-enabled').set('x-user-id', 'not-123').expect(403);
+        });
+
+        it('should throw a 403 - Forbidden exception if one of the flags is disabled', async () => {
+          jest.spyOn(defaultProvider, 'resolveBooleanEvaluation').mockResolvedValueOnce({
+            value: false,
+            reason: 'DISABLED',
+          });
+          await supertest(app.getHttpServer()).get('/require-flags-enabled').set('x-user-id', '123').expect(403);
+        });
+      });
+    });
   });
 
   describe('Without global context interceptor', () => {
-
     let moduleRef: TestingModule;
     let app: INestApplication;
 
     beforeAll(async () => {
-
       moduleRef = await Test.createTestingModule({
         imports: [
           OpenFeatureModule.forRoot({
             contextFactory: exampleContextFactory,
             defaultProvider,
             providers,
-            useGlobalInterceptor: false
+            useGlobalInterceptor: false,
           }),
         ],
         providers: [OpenFeatureTestService],
-        controllers: [OpenFeatureController, OpenFeatureControllerContextScopedController],
+        controllers: [OpenFeatureController, OpenFeatureContextScopedController],
       }).compile();
       app = moduleRef.createNestApplication();
       app = await app.init();
@@ -158,7 +212,7 @@ describe('OpenFeature SDK', () => {
     });
 
     describe('evaluation context service should', () => {
-      it('inject empty context if no context interceptor is configured', async function() {
+      it('inject empty context if no context interceptor is configured', async function () {
         const evaluationSpy = jest.spyOn(defaultProvider, 'resolveBooleanEvaluation');
         await supertest(app.getHttpServer())
           .get('/dynamic-context-in-service')
@@ -172,9 +226,26 @@ describe('OpenFeature SDK', () => {
     describe('With Controller bound Context interceptor', () => {
       it('should not use context if global context interceptor is not configured', async () => {
         const evaluationSpy = jest.spyOn(defaultProvider, 'resolveBooleanEvaluation');
-        await supertest(app.getHttpServer()).get('/controller-context').set('x-user-id', '123').expect(200).expect('true');
+        await supertest(app.getHttpServer())
+          .get('/controller-context')
+          .set('x-user-id', '123')
+          .expect(200)
+          .expect('true');
         expect(evaluationSpy).toHaveBeenCalledWith('testBooleanFlag', false, { targetingKey: '123' }, {});
       });
     });
+
+    describe('require flags enabled decorator', () => {
+      it('should return a 404 - Not Found exception if the flag is disabled', async () => {
+        jest.spyOn(providers.domainScopedClient, 'resolveBooleanEvaluation').mockResolvedValueOnce({
+          value: false,
+          reason: 'DISABLED',
+        });
+        await supertest(app.getHttpServer())
+          .get('/controller-context/flags-enabled')
+          .set('x-user-id', '123')
+          .expect(404);
+      });
+    });
   });
 });

packages/nest/test/test-app.ts

@@ -1,7 +1,14 @@
-import { Controller, Get, Injectable, UseInterceptors } from '@nestjs/common';
+import { Controller, ForbiddenException, Get, Injectable, UseInterceptors } from '@nestjs/common';
-import type { Observable} from 'rxjs';
+import type { Observable } from 'rxjs';
 import { map } from 'rxjs';
-import { BooleanFeatureFlag, ObjectFeatureFlag, NumberFeatureFlag, OpenFeatureClient, StringFeatureFlag } from '../src';
+import {
+  BooleanFeatureFlag,
+  ObjectFeatureFlag,
+  NumberFeatureFlag,
+  OpenFeatureClient,
+  StringFeatureFlag,
+  RequireFlagsEnabled,
+} from '../src';
 import type { Client, EvaluationDetails, FlagValue } from '@openfeature/server-sdk';
 import { EvaluationContextInterceptor } from '../src';
 
@@ -84,11 +91,40 @@ export class OpenFeatureController {
   public async handleDynamicContextInServiceRequest() {
     return this.testService.serviceMethodWithDynamicContext('testBooleanFlag');
   }
+
+  @RequireFlagsEnabled({
+    flags: [{ flagKey: 'testBooleanFlag' }],
+  })
+  @Get('/flags-enabled')
+  public async handleGuardedBooleanRequest() {
+    return 'Get Boolean Flag Success!';
+  }
+
+  @RequireFlagsEnabled({
+    flags: [{ flagKey: 'testBooleanFlag' }],
+    exception: new ForbiddenException(),
+  })
+  @Get('/flags-enabled-custom-exception')
+  public async handleBooleanRequestWithCustomException() {
+    return 'Get Boolean Flag Success!';
+  }
+
+  @RequireFlagsEnabled({
+    flags: [{ flagKey: 'testBooleanFlag2' }],
+    exception: new ForbiddenException(),
+    context: {
+      targetingKey: 'user-id',
+    },
+  })
+  @Get('/flags-enabled-custom-exception-with-context')
+  public async handleBooleanRequestWithCustomExceptionAndContext() {
+    return 'Get Boolean Flag Success!';
+  }
 }
 
 @Controller()
 @UseInterceptors(EvaluationContextInterceptor)
-export class OpenFeatureControllerContextScopedController {
+export class OpenFeatureContextScopedController {
   constructor(private testService: OpenFeatureTestService) {}
 
   @Get('/controller-context')
@@ -101,4 +137,27 @@ export class OpenFeatureControllerContextScopedController {
   ) {
     return feature.pipe(map((details) => this.testService.serviceMethod(details)));
   }
+
+  @RequireFlagsEnabled({
+    flags: [{ flagKey: 'testBooleanFlag' }],
+    domain: 'domainScopedClient',
+  })
+  @Get('/controller-context/flags-enabled')
+  public async handleBooleanRequest() {
+    return 'Get Boolean Flag Success!';
+  }
+}
+
+@Controller('require-flags-enabled')
+@RequireFlagsEnabled({
+  flags: [{ flagKey: 'testBooleanFlag', defaultValue: false }, { flagKey: 'testBooleanFlag2' }],
+  exception: new ForbiddenException(),
+})
+export class OpenFeatureRequireFlagsEnabledController {
+  constructor() {}
+
+  @Get('/')
+  public async handleGetRequest() {
+    return 'Hello, world!';
+  }
 }

packages/react/CHANGELOG.md

@@ -1,5 +1,32 @@
 # Changelog
 
+## [1.0.1](https://github.com/open-feature/js-sdk/compare/react-sdk-v1.0.0...react-sdk-v1.0.1) (2025-08-18)
+
+
+### 🐛 Bug Fixes
+
+* **react:** re-evaluate flags on re-render to detect silent provider … ([#1226](https://github.com/open-feature/js-sdk/issues/1226)) ([3105595](https://github.com/open-feature/js-sdk/commit/31055959265a53f52102590f54fa3168811ec678))
+
+## [1.0.0](https://github.com/open-feature/js-sdk/compare/react-sdk-v0.4.11...react-sdk-v1.0.0) (2025-04-14)
+
+
+### ✨ New Features
+
+* add polyfill for react use hook ([#1157](https://github.com/open-feature/js-sdk/issues/1157)) ([5afe61f](https://github.com/open-feature/js-sdk/commit/5afe61f9e351b037b04c93a1d81aee8016756748))
+* add support for abort controllers to event handlers ([#1151](https://github.com/open-feature/js-sdk/issues/1151)) ([6a22483](https://github.com/open-feature/js-sdk/commit/6a224830fa4e62fc30a7802536f6f6fc3f772038))
+
+## [0.4.11](https://github.com/open-feature/js-sdk/compare/react-sdk-v0.4.10...react-sdk-v0.4.11) (2025-02-07)
+
+
+### ✨ New Features
+
+* export useOpenFeatureClientStatus hook ([#1082](https://github.com/open-feature/js-sdk/issues/1082)) ([4a6b860](https://github.com/open-feature/js-sdk/commit/4a6b8605444edeaf43355713357fecb97dd850b6))
+
+
+### 🧹 Chore
+
+* update sdk peer ([#1142](https://github.com/open-feature/js-sdk/issues/1142)) ([8bb6206](https://github.com/open-feature/js-sdk/commit/8bb620601e2b8dc7b62d717169b585bd1c886996))
+
 ## [0.4.10](https://github.com/open-feature/js-sdk/compare/react-sdk-v0.4.9...react-sdk-v0.4.10) (2024-12-18)
 
 

packages/react/README.md

@@ -16,8 +16,8 @@
     <img alt="Specification" src="https://img.shields.io/static/v1?label=specification&message=v0.8.0&color=yellow&style=for-the-badge" />
   </a>
   <!-- x-release-please-start-version -->
-  <a href="https://github.com/open-feature/js-sdk/releases/tag/react-sdk-v0.4.10">
+  <a href="https://github.com/open-feature/js-sdk/releases/tag/react-sdk-v1.0.1">
-    <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v0.4.10&color=blue&style=for-the-badge" />
+    <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v1.0.1&color=blue&style=for-the-badge" />
   </a>
   <!-- x-release-please-end -->
   <br/>

packages/react/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openfeature/react-sdk",
-  "version": "0.4.10",
+  "version": "1.0.1",
   "description": "OpenFeature React SDK",
   "main": "./dist/cjs/index.js",
   "files": [
@@ -47,7 +47,7 @@
   },
   "homepage": "https://github.com/open-feature/js-sdk#readme",
   "peerDependencies": {
-    "@openfeature/web-sdk": "^1.3.0",
+    "@openfeature/web-sdk": "^1.5.0",
     "react": ">=16.8.0"
   },
   "devDependencies": {

packages/react/src/evaluation/use-feature-flag.ts

@@ -5,18 +5,24 @@ import type {
   EventHandler,
   FlagEvaluationOptions,
   FlagValue,
-  JsonValue} from '@openfeature/web-sdk';
+  JsonValue,
-import {
-  ProviderEvents,
-  ProviderStatus,
 } from '@openfeature/web-sdk';
-import { useEffect, useRef, useState } from 'react';
+import { ProviderEvents, ProviderStatus } from '@openfeature/web-sdk';
+import { useCallback, useEffect, useRef, useState } from 'react';
+import {
+  DEFAULT_OPTIONS,
+  isEqual,
+  normalizeOptions,
+  suspendUntilInitialized,
+  suspendUntilReconciled,
+  useProviderOptions,
+} from '../internal';
 import type { ReactFlagEvaluationNoSuspenseOptions, ReactFlagEvaluationOptions } from '../options';
-import { DEFAULT_OPTIONS, isEqual, normalizeOptions, suspendUntilReady, useProviderOptions } from '../internal';
 import { useOpenFeatureClient } from '../provider/use-open-feature-client';
 import { useOpenFeatureClientStatus } from '../provider/use-open-feature-client-status';
+import { useOpenFeatureProvider } from '../provider/use-open-feature-provider';
 import type { FlagQuery } from '../query';
-import { HookFlagQuery } from './hook-flag-query';
+import { HookFlagQuery } from '../internal/hook-flag-query';
 
 // This type is a bit wild-looking, but I think we need it.
 // We have to use the conditional, because otherwise useFlag('key', false) would return false, not boolean (too constrained).
@@ -280,27 +286,41 @@ function attachHandlersAndResolve<T extends FlagValue>(
   const defaultedOptions = { ...DEFAULT_OPTIONS, ...useProviderOptions(), ...normalizeOptions(options) };
   const client = useOpenFeatureClient();
   const status = useOpenFeatureClientStatus();
+  const provider = useOpenFeatureProvider();
+  const isFirstRender = useRef(true);
 
-  // suspense
   if (defaultedOptions.suspendUntilReady && status === ProviderStatus.NOT_READY) {
-    suspendUntilReady(client);
+    suspendUntilInitialized(provider, client);
   }
 
   if (defaultedOptions.suspendWhileReconciling && status === ProviderStatus.RECONCILING) {
-    suspendUntilReady(client);
+    suspendUntilReconciled(client);
   }
 
-  const [evaluationDetails, setEvaluationDetails] = useState<EvaluationDetails<T>>(
+  const [evaluationDetails, setEvaluationDetails] = useState<EvaluationDetails<T>>(() =>
     resolver(client).call(client, flagKey, defaultValue, options),
   );
   
+  // Re-evaluate when dependencies change (handles prop changes like flagKey), or if during a re-render, we have detected a change in the evaluated value
+  useEffect(() => {
+    if (isFirstRender.current) {
+      isFirstRender.current = false;
+      return;
+    }
+    
+    const newDetails = resolver(client).call(client, flagKey, defaultValue, options);
+    if (!isEqual(newDetails.value, evaluationDetails.value)) {
+      setEvaluationDetails(newDetails);
+    }
+  }, [client, flagKey, defaultValue, options, resolver, evaluationDetails]);
+
   // Maintain a mutable reference to the evaluation details to have a up-to-date reference in the handlers.
   const evaluationDetailsRef = useRef<EvaluationDetails<T>>(evaluationDetails);
   useEffect(() => {
     evaluationDetailsRef.current = evaluationDetails;
   }, [evaluationDetails]);
 
-  const updateEvaluationDetailsCallback = () => {
+  const updateEvaluationDetailsCallback = useCallback(() => {
     const updatedEvaluationDetails = resolver(client).call(client, flagKey, defaultValue, options);
 
     /**
@@ -311,41 +331,47 @@ function attachHandlersAndResolve<T extends FlagValue>(
     if (!isEqual(updatedEvaluationDetails.value, evaluationDetailsRef.current.value)) {
       setEvaluationDetails(updatedEvaluationDetails);
     }
-  };
+  }, [client, flagKey, defaultValue, options, resolver]);
 
-  const configurationChangeCallback: EventHandler<ClientProviderEvents.ConfigurationChanged> = (eventDetails) => {
+  const configurationChangeCallback = useCallback<EventHandler<ClientProviderEvents.ConfigurationChanged>>(
-    if (shouldEvaluateFlag(flagKey, eventDetails?.flagsChanged)) {
+    (eventDetails) => {
-      updateEvaluationDetailsCallback();
+      if (shouldEvaluateFlag(flagKey, eventDetails?.flagsChanged)) {
-    }
+        updateEvaluationDetailsCallback();
-  };
+      }
+    },
+    [flagKey, updateEvaluationDetailsCallback],
+  );
 
   useEffect(() => {
+    const controller = new AbortController();
     if (status === ProviderStatus.NOT_READY) {
       // update when the provider is ready
-      client.addHandler(ProviderEvents.Ready, updateEvaluationDetailsCallback);
+      client.addHandler(ProviderEvents.Ready, updateEvaluationDetailsCallback, { signal: controller.signal });
     }
 
     if (defaultedOptions.updateOnContextChanged) {
       // update when the context changes
-      client.addHandler(ProviderEvents.ContextChanged, updateEvaluationDetailsCallback);
+      client.addHandler(ProviderEvents.ContextChanged, updateEvaluationDetailsCallback, { signal: controller.signal });
     }
-    return () => {
-      // cleanup the handlers
-      client.removeHandler(ProviderEvents.Ready, updateEvaluationDetailsCallback);
-      client.removeHandler(ProviderEvents.ContextChanged, updateEvaluationDetailsCallback);
-    };
-  }, []);
 
-  useEffect(() => {
     if (defaultedOptions.updateOnConfigurationChanged) {
       // update when the provider configuration changes
-      client.addHandler(ProviderEvents.ConfigurationChanged, configurationChangeCallback);
+      client.addHandler(ProviderEvents.ConfigurationChanged, configurationChangeCallback, {
+        signal: controller.signal,
+      });
     }
     return () => {
       // cleanup the handlers
-      client.removeHandler(ProviderEvents.ConfigurationChanged, configurationChangeCallback);
+      controller.abort();
     };
-  }, []);
+  }, [
+    client,
+    status,
+    defaultedOptions.updateOnContextChanged,
+    defaultedOptions.updateOnConfigurationChanged,
+    updateEvaluationDetailsCallback,
+    configurationChangeCallback,
+  ]);
 
   return evaluationDetails;
 }

packages/react/src/internal/context.ts

@@ -5,7 +5,8 @@ import { normalizeOptions } from '.';
 
 /**
  * The underlying React context.
- * DO NOT EXPORT PUBLICLY
+ *
+ * **DO NOT EXPORT PUBLICLY**
  * @internal
  */
 export const Context = React.createContext<
@@ -14,7 +15,8 @@ export const Context = React.createContext<
 
 /**
  * Get a normalized copy of the options used for this OpenFeatureProvider, see {@link normalizeOptions}.
- * DO NOT EXPORT PUBLICLY
+ *
+ * **DO NOT EXPORT PUBLICLY**
  * @internal
  * @returns {NormalizedOptions} normalized options the defaulted options, not defaulted or normalized.
  */

packages/react/src/internal/errors.ts

@@ -0,0 +1,9 @@
+const context = 'Components using OpenFeature must be wrapped with an <OpenFeatureProvider>.';
+const tip = 'If you are seeing this in a test, see: https://openfeature.dev/docs/reference/technologies/client/web/react#testing';
+
+export class MissingContextError extends Error {
+  constructor(reason: string) {
+    super(`${reason}: ${context} ${tip}`);
+    this.name = 'MissingContextError';
+  }
+}

packages/react/src/internal/suspense.ts

@@ -1,21 +1,56 @@
-import type { Client} from '@openfeature/web-sdk';
+import type { Client, Provider } from '@openfeature/web-sdk';
-import { ProviderEvents } from '@openfeature/web-sdk';
+import { NOOP_PROVIDER, ProviderEvents } from '@openfeature/web-sdk';
+import { use } from './use';
+
+/**
+ * A weak map is used to store the global suspense status for each provider. It's
+ * important for this to be global to avoid rerender loops. Using useRef won't
+ * work because the value isn't preserved when a promise is thrown in a component,
+ * which is how suspense operates.
+ */
+const globalProviderSuspenseStatus = new WeakMap<Provider, Promise<unknown>>();
 
 /**
  * Suspends until the client is ready to evaluate feature flags.
- * DO NOT EXPORT PUBLICLY
+ *
- * @param {Client} client OpenFeature client
+ * **DO NOT EXPORT PUBLICLY**
+ * @internal
+ * @param {Provider} provider the provider to suspend for
+ * @param {Client} client the client to check for readiness
  */
-export function suspendUntilReady(client: Client): Promise<void> {
+export function suspendUntilInitialized(provider: Provider, client: Client) {
-  let resolve: (value: unknown) => void;
+  const statusPromiseRef = globalProviderSuspenseStatus.get(provider);
-  let reject: () => void;
+  if (!statusPromiseRef) {
-  throw new Promise((_resolve, _reject) => {
+    // Noop provider is never ready, so we resolve immediately
-    resolve = _resolve;
+    const statusPromise = provider !== NOOP_PROVIDER ? isProviderReady(client) : Promise.resolve();
-    reject = _reject;
+    globalProviderSuspenseStatus.set(provider, statusPromise);
-    client.addHandler(ProviderEvents.Ready, resolve);
+    // Use will throw the promise and React will trigger a rerender when it's resolved
-    client.addHandler(ProviderEvents.Error, reject);
+    use(statusPromise);
-  }).finally(() => {
+  } else {
-    client.removeHandler(ProviderEvents.Ready, resolve);
+    // Reuse the existing promise, use won't rethrow if the promise has settled.
-    client.removeHandler(ProviderEvents.Ready, reject);
+    use(statusPromiseRef);
-  });
+  }
+}
+
+/**
+ * Suspends until the provider has finished reconciling.
+ *
+ * **DO NOT EXPORT PUBLICLY**
+ * @internal
+ * @param {Client} client the client to check for readiness
+ */
+export function suspendUntilReconciled(client: Client) {
+  use(isProviderReady(client));
+}
+
+async function isProviderReady(client: Client) {
+  const controller = new AbortController();
+  try {
+    return await new Promise((resolve, reject) => {
+      client.addHandler(ProviderEvents.Ready, resolve, { signal: controller.signal });
+      client.addHandler(ProviderEvents.Error, reject, { signal: controller.signal });
+    });
+  } finally {
+    controller.abort();
+  }
 }

packages/react/src/internal/use.ts

@@ -0,0 +1,53 @@
+/// <reference types="react/experimental" />
+// This function is adopted from https://github.com/vercel/swr
+import React from 'react';
+
+/**
+ * Extends a Promise-like value to include status tracking.
+ * The extra properties are used to manage the lifecycle of the Promise, indicating its current state.
+ * More information can be found in the React RFE for the use hook.
+ * @see https://github.com/reactjs/rfcs/pull/229
+ */
+export type UsePromise<T> =
+  Promise<T> & {
+    status?: 'pending' | 'fulfilled' | 'rejected';
+    value?: T;
+    reason?: unknown;
+  };
+
+/**
+ * React.use is a React API that lets you read the value of a resource like a Promise or context.
+ * It was officially added in React 19, so needs to be polyfilled to support older React versions.
+ * @param {UsePromise} thenable A thenable object that represents a Promise-like value.
+ * @returns {unknown} The resolved value of the thenable or throws if it's still pending or rejected.
+ */
+export const use =
+  React.use ||
+  // This extra generic is to avoid TypeScript mixing up the generic and JSX syntax
+  // and emitting an error.
+  // We assume that this is only for the `use(thenable)` case, not `use(context)`.
+  // https://github.com/facebook/react/blob/aed00dacfb79d17c53218404c52b1c7aa59c4a89/packages/react-server/src/ReactFizzThenable.js#L45
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  (<T, _>(thenable: UsePromise<T>): T => {
+    switch (thenable.status) {
+      case 'pending':
+        throw thenable;
+      case 'fulfilled':
+        return thenable.value as T;
+      case 'rejected':
+        throw thenable.reason;
+      default:
+        thenable.status = 'pending';
+        thenable.then(
+          (v) => {
+            thenable.status = 'fulfilled';
+            thenable.value = v;
+          },
+          (e) => {
+            thenable.status = 'rejected';
+            thenable.reason = e;
+          },
+        );
+        throw thenable;
+    }
+  });

packages/react/src/provider/provider.tsx

@@ -31,7 +31,7 @@ type ProviderProps = {
    * @param {ProviderProps} properties props for the context provider
    * @returns {OpenFeatureProvider} context provider
    */
-export function OpenFeatureProvider({ client, domain, children, ...options }: ProviderProps) {
+export function OpenFeatureProvider({ client, domain, children, ...options }: ProviderProps): JSX.Element {
   if (!client) {
     client = OpenFeature.getClient(domain);
   }

packages/react/src/provider/use-open-feature-client-status.ts

@@ -10,22 +10,18 @@ import { ProviderEvents } from '@openfeature/web-sdk';
 export function useOpenFeatureClientStatus(): ProviderStatus {
   const client = useOpenFeatureClient();
   const [status, setStatus] = useState<ProviderStatus>(client.providerStatus);
+  const controller = new AbortController();
 
   useEffect(() => {
     const updateStatus = () => setStatus(client.providerStatus);
-    client.addHandler(ProviderEvents.ConfigurationChanged, updateStatus);
+    client.addHandler(ProviderEvents.ConfigurationChanged, updateStatus, { signal: controller.signal });
-    client.addHandler(ProviderEvents.ContextChanged, updateStatus);
+    client.addHandler(ProviderEvents.ContextChanged, updateStatus, { signal: controller.signal });
-    client.addHandler(ProviderEvents.Error, updateStatus);
+    client.addHandler(ProviderEvents.Error, updateStatus, { signal: controller.signal });
-    client.addHandler(ProviderEvents.Ready, updateStatus);
+    client.addHandler(ProviderEvents.Ready, updateStatus, { signal: controller.signal });
-    client.addHandler(ProviderEvents.Stale, updateStatus);
+    client.addHandler(ProviderEvents.Stale, updateStatus, { signal: controller.signal });
-    client.addHandler(ProviderEvents.Reconciling, updateStatus);
+    client.addHandler(ProviderEvents.Reconciling, updateStatus, { signal: controller.signal });
     return () => {
-      client.removeHandler(ProviderEvents.ConfigurationChanged, updateStatus);
+      controller.abort();
-      client.removeHandler(ProviderEvents.ContextChanged, updateStatus);
-      client.removeHandler(ProviderEvents.Error, updateStatus);
-      client.removeHandler(ProviderEvents.Ready, updateStatus);
-      client.removeHandler(ProviderEvents.Stale, updateStatus);
-      client.removeHandler(ProviderEvents.Reconciling, updateStatus);
     };
   }, [client]);
 

packages/react/src/provider/use-open-feature-client.ts

@@ -1,6 +1,7 @@
 import React from 'react';
 import { Context } from '../internal';
-import type { Client } from '@openfeature/web-sdk';
+import { type Client } from '@openfeature/web-sdk';
+import { MissingContextError } from '../internal/errors';
 
 /**
  * Get the {@link Client} instance for this OpenFeatureProvider context.
@@ -11,9 +12,7 @@ export function useOpenFeatureClient(): Client {
   const { client } = React.useContext(Context) || {};
 
   if (!client) {
-    throw new Error(
+    throw new MissingContextError('No OpenFeature client available');
-      'No OpenFeature client available - components using OpenFeature must be wrapped with an <OpenFeatureProvider>. If you are seeing this in a test, see: https://openfeature.dev/docs/reference/technologies/client/web/react#testing',
-    );
   }
 
   return client;

packages/react/src/provider/use-open-feature-provider.ts

@@ -0,0 +1,21 @@
+import React from 'react';
+import { Context } from '../internal';
+import { OpenFeature } from '@openfeature/web-sdk';
+import type { Provider } from '@openfeature/web-sdk';
+import { MissingContextError } from '../internal/errors';
+
+/**
+ * Get the {@link Provider} bound to the domain specified in the OpenFeatureProvider context.
+ * Note that it isn't recommended to interact with the provider directly, but rather through
+ * an OpenFeature client.
+ * @returns {Provider} provider for this scope
+ */
+export function useOpenFeatureProvider(): Provider {
+  const openFeatureContext = React.useContext(Context);
+
+  if (!openFeatureContext) {
+    throw new MissingContextError('No OpenFeature context available');
+  }
+
+  return OpenFeature.getProvider(openFeatureContext.domain);
+}

packages/react/src/provider/use-when-provider-ready.ts

@@ -2,7 +2,8 @@ import { ProviderStatus } from '@openfeature/web-sdk';
 import { useOpenFeatureClient } from './use-open-feature-client';
 import { useOpenFeatureClientStatus } from './use-open-feature-client-status';
 import type { ReactFlagEvaluationOptions } from '../options';
-import { DEFAULT_OPTIONS, useProviderOptions, normalizeOptions, suspendUntilReady } from '../internal';
+import { DEFAULT_OPTIONS, useProviderOptions, normalizeOptions, suspendUntilInitialized } from '../internal';
+import { useOpenFeatureProvider } from './use-open-feature-provider';
 
 type Options = Pick<ReactFlagEvaluationOptions, 'suspendUntilReady'>;
 
@@ -14,14 +15,14 @@ type Options = Pick<ReactFlagEvaluationOptions, 'suspendUntilReady'>;
  * @returns {boolean} boolean indicating if provider is {@link ProviderStatus.READY}, useful if suspense is disabled and you want to handle loaders on your own
  */
 export function useWhenProviderReady(options?: Options): boolean {
-  const client = useOpenFeatureClient();
-  const status = useOpenFeatureClientStatus();
   // highest priority > evaluation hook options > provider options > default options > lowest priority
   const defaultedOptions = { ...DEFAULT_OPTIONS, ...useProviderOptions(), ...normalizeOptions(options) };
+  const client = useOpenFeatureClient();
+  const status = useOpenFeatureClientStatus();
+  const provider = useOpenFeatureProvider();
 
-  // suspense
   if (defaultedOptions.suspendUntilReady && status === ProviderStatus.NOT_READY) {
-    suspendUntilReady(client);
+    suspendUntilInitialized(provider, client);
   }
 
   return status === ProviderStatus.READY;

packages/react/test/evaluation.spec.tsx

@@ -6,12 +6,7 @@ import '@testing-library/jest-dom'; // see: https://testing-library.com/docs/rea
 import { act, render, renderHook, screen, waitFor } from '@testing-library/react';
 import * as React from 'react';
 import { startTransition, useState } from 'react';
-import type {
+import type { EvaluationContext, EvaluationDetails, EventContext, Hook } from '../src/';
-  EvaluationContext,
-  EvaluationDetails,
-  EventContext,
-  Hook
-} from '../src/';
 import {
   ErrorCode,
   InMemoryProvider,
@@ -27,15 +22,18 @@ import {
   useObjectFlagValue,
   useStringFlagDetails,
   useStringFlagValue,
-  useSuspenseFlag
+  useSuspenseFlag,
 } from '../src/';
-import { HookFlagQuery } from '../src/evaluation/hook-flag-query';
+import { HookFlagQuery } from '../src/internal/hook-flag-query';
 import { TestingProvider } from './test.utils';
 
 // custom provider to have better control over the emitted events
 class CustomEventInMemoryProvider extends InMemoryProvider {
-
+  putConfigurationWithCustomEvent(
-  putConfigurationWithCustomEvent(flagConfiguration: FlagConfiguration, event: ProviderEmittableEvents, eventContext: EventContext) {
+    flagConfiguration: FlagConfiguration,
+    event: ProviderEmittableEvents,
+    eventContext: EventContext,
+  ) {
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     this['_flagConfiguration'] = { ...flagConfiguration }; // private access hack
     this.events.emit(event, eventContext);
@@ -395,16 +393,19 @@ describe('evaluation', () => {
 
         expect(screen.queryByTestId('render-count')).toHaveTextContent('1');
         await act(async () => {
-          await rerenderProvider.putConfigurationWithCustomEvent({
+          await rerenderProvider.putConfigurationWithCustomEvent(
-            ...FLAG_CONFIG,
+            {
-            [BOOL_FLAG_KEY]: {
+              ...FLAG_CONFIG,
-              ...FLAG_CONFIG[BOOL_FLAG_KEY],
+              [BOOL_FLAG_KEY]: {
-              // Change the default; this should be ignored and not cause a re-render because flagsChanged is empty
+                ...FLAG_CONFIG[BOOL_FLAG_KEY],
-              defaultVariant: 'off',
+                // Change the default; this should be ignored and not cause a re-render because flagsChanged is empty
+                defaultVariant: 'off',
+              },
+              // if the flagsChanged is empty, we know nothing has changed, so we don't bother diffing
             },
-             // if the flagsChanged is empty, we know nothing has changed, so we don't bother diffing
+            ClientProviderEvents.ConfigurationChanged,
-          }, ClientProviderEvents.ConfigurationChanged, { flagsChanged: [] });
+            { flagsChanged: [] },
-
+          );
         });
 
         expect(screen.queryByTestId('render-count')).toHaveTextContent('1');
@@ -420,16 +421,19 @@ describe('evaluation', () => {
 
         expect(screen.queryByTestId('render-count')).toHaveTextContent('1');
         await act(async () => {
-          await rerenderProvider.putConfigurationWithCustomEvent({
+          await rerenderProvider.putConfigurationWithCustomEvent(
-            ...FLAG_CONFIG,
+            {
-            [BOOL_FLAG_KEY]: {
+              ...FLAG_CONFIG,
-              ...FLAG_CONFIG[BOOL_FLAG_KEY],
+              [BOOL_FLAG_KEY]: {
-              // Change the default variant to trigger a rerender since not only do we check flagsChanged, but we also diff the value
+                ...FLAG_CONFIG[BOOL_FLAG_KEY],
-              defaultVariant: 'off',
+                // Change the default variant to trigger a rerender since not only do we check flagsChanged, but we also diff the value
+                defaultVariant: 'off',
+              },
+              // if the flagsChanged is falsy, we don't know what flags changed - so we attempt to diff everything
             },
-             // if the flagsChanged is falsy, we don't know what flags changed - so we attempt to diff everything
+            ClientProviderEvents.ConfigurationChanged,
-          }, ClientProviderEvents.ConfigurationChanged, { flagsChanged: undefined });
+            { flagsChanged: undefined },
-
+          );
         });
 
         expect(screen.queryByTestId('render-count')).toHaveTextContent('2');
@@ -573,10 +577,41 @@ describe('evaluation', () => {
       },
     };
 
+    afterEach(() => {
+      OpenFeature.clearProviders();
+    });
+
     const suspendingProvider = () => {
       return new TestingProvider(CONFIG, DELAY); // delay init by 100ms
     };
 
+    describe('when using the noop provider', () => {
+      function TestComponent() {
+        const { value } = useSuspenseFlag(SUSPENSE_FLAG_KEY, DEFAULT);
+        return (
+          <>
+            <div>{value}</div>
+          </>
+        );
+      }
+      it('should fallback to the default value on the next rerender', async () => {
+        render(
+          <OpenFeatureProvider>
+            <React.Suspense fallback={<div>{FALLBACK}</div>}>
+              <TestComponent></TestComponent>
+            </React.Suspense>
+          </OpenFeatureProvider>,
+        );
+        // The loading indicator should be shown on the first render
+        expect(screen.queryByText(FALLBACK)).toBeInTheDocument();
+
+        // The default value should be shown on the next render
+        await waitFor(() => expect(screen.queryByText(DEFAULT)).toBeInTheDocument(), {
+          timeout: DELAY,
+        });
+      });
+    });
+
     describe('updateOnConfigurationChanged=true (default)', () => {
       function TestComponent() {
         const { value } = useFlag(SUSPENSE_FLAG_KEY, DEFAULT);
@@ -889,17 +924,124 @@ describe('evaluation', () => {
           OpenFeature.setContext(SUSPEND_OFF, { user: TARGETED_USER });
         });
 
-        // expect to see static value until we reconcile
+        // With the fix for useState initialization, the hook now immediately
-        await waitFor(() => expect(screen.queryByText(STATIC_FLAG_VALUE_A)).toBeInTheDocument(), {
+        // reflects provider state changes. This is intentional to handle cases
-          timeout: DELAY / 2,
+        // where providers don't emit proper events.
-        });
+        // The value updates immediately to the targeted value.
-
-        // make sure we updated after reconciling
         await waitFor(() => expect(screen.queryByText(TARGETED_FLAG_VALUE)).toBeInTheDocument(), {
           timeout: DELAY * 2,
         });
       });
     });
+
+    describe('re-render behavior when flag values change without provider events', ()=> {
+      it('should reflect provider state changes on re-render even without provider events', async () => {
+        let providerValue = 'initial-value';
+        
+        class SilentUpdateProvider extends InMemoryProvider {
+          resolveBooleanEvaluation() {
+            return {
+              value: true,
+              variant: 'on',
+              reason: StandardResolutionReasons.STATIC,
+            };
+          }
+          
+          resolveStringEvaluation() {
+            return {
+              value: providerValue,
+              variant: providerValue,
+              reason: StandardResolutionReasons.STATIC,
+            };
+          }
+        }
+        
+        const provider = new SilentUpdateProvider({});
+        await OpenFeature.setProviderAndWait('test', provider);
+        
+        // The triggerRender prop forces a re-render
+        const TestComponent = ({ triggerRender }: { triggerRender: number }) => {
+          const { value } = useFlag('test-flag', 'default');
+          return <div data-testid="flag-value" data-render-count={triggerRender}>{value}</div>;
+        };
+        
+        const WrapperComponent = () => {
+          const [renderCount, setRenderCount] = useState(0);
+          return (
+            <>
+              <button onClick={() => setRenderCount(c => c + 1)}>Force Re-render</button>
+              <TestComponent triggerRender={renderCount} />
+            </>
+          );
+        };
+        
+        const { getByText } = render(
+          <OpenFeatureProvider client={OpenFeature.getClient('test')}>
+            <WrapperComponent />
+          </OpenFeatureProvider>
+        );
+        
+        // Initial value should be rendered
+        await waitFor(() => {
+          expect(screen.getByTestId('flag-value')).toHaveTextContent('initial-value');
+        });
+        
+        // Change the provider's internal state (without emitting events)
+        providerValue = 'updated-value';
+        
+        // Force a re-render of the component
+        act(() => {
+          getByText('Force Re-render').click();
+        });
+        
+        await waitFor(() => {
+          expect(screen.getByTestId('flag-value')).toHaveTextContent('updated-value');
+        });
+      });
+
+      it('should update flag value when flag key prop changes without provider events', async () => {
+        const provider = new InMemoryProvider({
+          'flag-a': {
+            disabled: false,
+            variants: { on: 'value-a' },
+            defaultVariant: 'on',
+          },
+          'flag-b': {
+            disabled: false,
+            variants: { on: 'value-b' },
+            defaultVariant: 'on',
+          },
+        });
+        
+        await OpenFeature.setProviderAndWait(EVALUATION, provider);
+        
+        const TestComponent = ({ flagKey }: { flagKey: string }) => {
+          const { value } = useFlag(flagKey, 'default');
+          return <div data-testid="flag-value">{value}</div>;
+        };
+        
+        const { rerender } = render(
+          <OpenFeatureProvider client={OpenFeature.getClient(EVALUATION)}>
+            <TestComponent flagKey="flag-a" />
+          </OpenFeatureProvider>
+        );
+        
+        await waitFor(() => {
+          expect(screen.getByTestId('flag-value')).toHaveTextContent('value-a');
+        });
+        
+        // Change to flag-b (without any provider events)
+        rerender(
+          <OpenFeatureProvider client={OpenFeature.getClient(EVALUATION)}>
+            <TestComponent flagKey="flag-b" />
+          </OpenFeatureProvider>
+        );
+        
+        await waitFor(() => {
+          expect(screen.getByTestId('flag-value')).toHaveTextContent('value-b');
+        });
+      });
+    });
   });
 
   describe('context, hooks and options', () => {

packages/react/test/provider.spec.tsx

@@ -288,7 +288,7 @@ describe('OpenFeatureProvider', () => {
         { timeout: DELAY * 4 },
       );
 
-      expect(screen.getByText('Will says hi')).toBeInTheDocument();
+      expect(screen.getByText('Will says aloha')).toBeInTheDocument();
     });
   });
 });

packages/server/CHANGELOG.md

@@ -1,5 +1,35 @@
 # Changelog
 
+## [1.19.0](https://github.com/open-feature/js-sdk/compare/server-sdk-v1.18.0...server-sdk-v1.19.0) (2025-08-14)
+
+
+### ✨ New Features
+
+* add evaluation-scoped hook data ([#1216](https://github.com/open-feature/js-sdk/issues/1216)) ([07af3a9](https://github.com/open-feature/js-sdk/commit/07af3a9eda895e9edb24c7ee1e3c1c4f16e17431))
+
+
+### 🐛 Bug Fixes
+
+* update core dep ([#1228](https://github.com/open-feature/js-sdk/issues/1228)) ([845d24c](https://github.com/open-feature/js-sdk/commit/845d24c5fecc80de3080e49fde839f08ecac6b33))
+
+
+### 🧹 Chore
+
+* update node to v20+ ([#1203](https://github.com/open-feature/js-sdk/issues/1203)) ([1f33453](https://github.com/open-feature/js-sdk/commit/1f33453c23df0763cbf0d0b44db8d91216377009))
+
+
+### 📚 Documentation
+
+* Clarify the behavior of setProviderAndWait ([#1180](https://github.com/open-feature/js-sdk/issues/1180)) ([4fe8d87](https://github.com/open-feature/js-sdk/commit/4fe8d87a2e5df2cbd4086cc4f4a380e8857ed8ba))
+
+## [1.18.0](https://github.com/open-feature/js-sdk/compare/server-sdk-v1.17.1...server-sdk-v1.18.0) (2025-04-11)
+
+
+### ✨ New Features
+
+* add a top-level method for accessing providers ([#1152](https://github.com/open-feature/js-sdk/issues/1152)) ([ae8fce8](https://github.com/open-feature/js-sdk/commit/ae8fce87530005ed20f7e68dc696ce67053fca31))
+* add support for abort controllers to event handlers ([#1151](https://github.com/open-feature/js-sdk/issues/1151)) ([6a22483](https://github.com/open-feature/js-sdk/commit/6a224830fa4e62fc30a7802536f6f6fc3f772038))
+
 ## [1.17.1](https://github.com/open-feature/js-sdk/compare/server-sdk-v1.17.0...server-sdk-v1.17.1) (2025-02-07)
 
 

packages/server/README.md

@@ -16,8 +16,8 @@
     <img alt="Specification" src="https://img.shields.io/static/v1?label=specification&message=v0.8.0&color=yellow&style=for-the-badge" />
   </a>
   <!-- x-release-please-start-version -->
-  <a href="https://github.com/open-feature/js-sdk/releases/tag/server-sdk-v1.17.1">
+  <a href="https://github.com/open-feature/js-sdk/releases/tag/server-sdk-v1.19.0">
-    <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v1.17.1&color=blue&style=for-the-badge" />
+    <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v1.19.0&color=blue&style=for-the-badge" />
   </a>
   <!-- x-release-please-end -->
   <br/>
@@ -75,7 +75,11 @@ yarn add @openfeature/server-sdk @openfeature/core
 import { OpenFeature } from '@openfeature/server-sdk';
 
 // Register your feature flag provider
-await OpenFeature.setProviderAndWait(new YourProviderOfChoice());
+try {
+  await OpenFeature.setProviderAndWait(new YourProviderOfChoice());
+} catch (error) {
+  console.error('Failed to initialize provider:', error);
+}
 
 // create a new client
 const client = OpenFeature.getClient();

packages/server/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openfeature/server-sdk",
-  "version": "1.17.1",
+  "version": "1.19.0",
   "description": "OpenFeature SDK for JavaScript",
   "main": "./dist/cjs/index.js",
   "files": [
@@ -45,12 +45,12 @@
   },
   "homepage": "https://github.com/open-feature/js-sdk#readme",
   "engines": {
-    "node": ">=18"
+    "node": ">=20"
   },
   "peerDependencies": {
-    "@openfeature/core": "^1.7.0"
+    "@openfeature/core": "^1.9.0"
   },
   "devDependencies": {
-    "@openfeature/core": "^1.7.0"
+    "@openfeature/core": "^1.9.0"
   }
 }

packages/server/src/client/internal/open-feature-client.ts

@@ -12,6 +12,7 @@ import type {
   OpenFeatureError,
   FlagMetadata,
   ResolutionDetails,
+  EventOptions,
 } from '@openfeature/core';
 import {
   ErrorCode,
@@ -21,6 +22,7 @@ import {
   StandardResolutionReasons,
   instantiateErrorByErrorCode,
   statusMatchesEvent,
+  MapHookData,
 } from '@openfeature/core';
 import type { FlagEvaluationOptions } from '../../evaluation';
 import type { ProviderEvents } from '../../events';
@@ -79,7 +81,7 @@ export class OpenFeatureClient implements Client {
     return this.providerStatusAccessor();
   }
 
-  addHandler(eventType: ProviderEvents, handler: EventHandler): void {
+  addHandler(eventType: ProviderEvents, handler: EventHandler, options?: EventOptions): void {
     this.emitterAccessor().addHandler(eventType, handler);
     const shouldRunNow = statusMatchesEvent(eventType, this._providerStatus);
 
@@ -95,6 +97,12 @@ export class OpenFeatureClient implements Client {
         this._logger?.error('Error running event handler:', err);
       }
     }
+
+    if (options?.signal && typeof options.signal.addEventListener === 'function') {
+      options.signal.addEventListener('abort', () => {
+        this.removeHandler(eventType, handler);
+      });
+    }
   }
 
   removeHandler(eventType: ProviderEvents, handler: EventHandler) {
@@ -269,22 +277,26 @@ export class OpenFeatureClient implements Client {
 
     const mergedContext = this.mergeContexts(invocationContext);
 
-    // this reference cannot change during the course of evaluation
+    // Create hook context instances for each hook (stable object references for the entire evaluation)
-    // it may be used as a key in WeakMaps
+    // This ensures hooks can use WeakMaps with hookContext as keys across lifecycle methods
-    const hookContext: Readonly<HookContext> = {
+    // NOTE: Uses the reversed order to reduce the number of times we have to calculate the index.
-      flagKey,
+    const hookContexts = allHooksReversed.map<HookContext>(() =>
-      defaultValue,
+      Object.freeze({
-      flagValueType: flagType,
+        flagKey,
-      clientMetadata: this.metadata,
+        defaultValue,
-      providerMetadata: this._provider.metadata,
+        flagValueType: flagType,
-      context: mergedContext,
+        clientMetadata: this.metadata,
-      logger: this._logger,
+        providerMetadata: this._provider.metadata,
-    };
+        context: mergedContext,
+        logger: this._logger,
+        hookData: new MapHookData(),
+      }),
+    );
 
     let evaluationDetails: EvaluationDetails<T>;
 
     try {
-      const frozenContext = await this.beforeHooks(allHooks, hookContext, options);
+      const frozenContext = await this.beforeHooks(allHooks, hookContexts, mergedContext, options);
 
       this.shortCircuitIfNotReady();
 
@@ -299,53 +311,71 @@ export class OpenFeatureClient implements Client {
 
       if (resolutionDetails.errorCode) {
         const err = instantiateErrorByErrorCode(resolutionDetails.errorCode, resolutionDetails.errorMessage);
-        await this.errorHooks(allHooksReversed, hookContext, err, options);
+        await this.errorHooks(allHooksReversed, hookContexts, err, options);
         evaluationDetails = this.getErrorEvaluationDetails(flagKey, defaultValue, err, resolutionDetails.flagMetadata);
       } else {
-        await this.afterHooks(allHooksReversed, hookContext, resolutionDetails, options);
+        await this.afterHooks(allHooksReversed, hookContexts, resolutionDetails, options);
         evaluationDetails = resolutionDetails;
       }
     } catch (err: unknown) {
-      await this.errorHooks(allHooksReversed, hookContext, err, options);
+      await this.errorHooks(allHooksReversed, hookContexts, err, options);
       evaluationDetails = this.getErrorEvaluationDetails(flagKey, defaultValue, err);
     }
 
-    await this.finallyHooks(allHooksReversed, hookContext, evaluationDetails, options);
+    await this.finallyHooks(allHooksReversed, hookContexts, evaluationDetails, options);
     return evaluationDetails;
   }
 
-  private async beforeHooks(hooks: Hook[], hookContext: HookContext, options: FlagEvaluationOptions) {
+  private async beforeHooks(
-    for (const hook of hooks) {
+    hooks: Hook[],
-      // freeze the hookContext
+    hookContexts: HookContext[],
-      Object.freeze(hookContext);
+    mergedContext: EvaluationContext,
+    options: FlagEvaluationOptions,
+  ) {
+    let accumulatedContext = mergedContext;
 
-      // use Object.assign to avoid modification of frozen hookContext
+    for (const [index, hook] of hooks.entries()) {
-      Object.assign(hookContext.context, {
+      const hookContextIndex = hooks.length - 1 - index; // reverse index for before hooks
-        ...hookContext.context,
+      const hookContext = hookContexts[hookContextIndex];
-        ...(await hook?.before?.(hookContext, Object.freeze(options.hookHints))),
+
-      });
+      // Update the context on the stable hook context object
+      Object.assign(hookContext.context, accumulatedContext);
+
+      const hookResult = await hook?.before?.(hookContext, Object.freeze(options.hookHints));
+      if (hookResult) {
+        accumulatedContext = {
+          ...accumulatedContext,
+          ...hookResult,
+        };
+
+        for (let i = 0; i < hooks.length; i++) {
+          Object.assign(hookContexts[hookContextIndex].context, accumulatedContext);
+        }
+      }
     }
 
     // after before hooks, freeze the EvaluationContext.
-    return Object.freeze(hookContext.context);
+    return Object.freeze(accumulatedContext);
   }
 
   private async afterHooks(
     hooks: Hook[],
-    hookContext: HookContext,
+    hookContexts: HookContext[],
     evaluationDetails: EvaluationDetails<FlagValue>,
     options: FlagEvaluationOptions,
   ) {
     // run "after" hooks sequentially
-    for (const hook of hooks) {
+    for (const [index, hook] of hooks.entries()) {
+      const hookContext = hookContexts[index];
       await hook?.after?.(hookContext, evaluationDetails, options.hookHints);
     }
   }
 
-  private async errorHooks(hooks: Hook[], hookContext: HookContext, err: unknown, options: FlagEvaluationOptions) {
+  private async errorHooks(hooks: Hook[], hookContexts: HookContext[], err: unknown, options: FlagEvaluationOptions) {
     // run "error" hooks sequentially
-    for (const hook of hooks) {
+    for (const [index, hook] of hooks.entries()) {
       try {
+        const hookContext = hookContexts[index];
         await hook?.error?.(hookContext, err, options.hookHints);
       } catch (err) {
         this._logger.error(`Unhandled error during 'error' hook: ${err}`);
@@ -359,13 +389,14 @@ export class OpenFeatureClient implements Client {
 
   private async finallyHooks(
     hooks: Hook[],
-    hookContext: HookContext,
+    hookContexts: HookContext[],
     evaluationDetails: EvaluationDetails<FlagValue>,
     options: FlagEvaluationOptions,
   ) {
     // run "finally" hooks sequentially
-    for (const hook of hooks) {
+    for (const [index, hook] of hooks.entries()) {
       try {
+        const hookContext = hookContexts[index];
         await hook?.finally?.(hookContext, evaluationDetails, options.hookHints);
       } catch (err) {
         this._logger.error(`Unhandled error during 'finally' hook: ${err}`);

packages/server/src/hooks/hook.ts

@@ -1,7 +1,8 @@
 import type { BaseHook, EvaluationContext, FlagValue } from '@openfeature/core';
 
-export type Hook = BaseHook<
+export type Hook<TData = Record<string, unknown>> = BaseHook<
   FlagValue,
+  TData,
   Promise<EvaluationContext | void> | EvaluationContext | void,
   Promise<void> | void
 >;

packages/server/src/open-feature.ts

@@ -82,7 +82,7 @@ export class OpenFeatureAPI
    * Setting a provider supersedes the current provider used in new and existing unbound clients.
    * @param {Provider} provider The provider responsible for flag evaluations.
    * @returns {Promise<void>}
-   * @throws Uncaught exceptions thrown by the provider during initialization.
+   * @throws {Error} If the provider throws an exception during initialization.
    */
   setProviderAndWait(provider: Provider): Promise<void>;
   /**
@@ -92,7 +92,7 @@ export class OpenFeatureAPI
    * @param {string} domain The name to identify the client
    * @param {Provider} provider The provider responsible for flag evaluations.
    * @returns {Promise<void>}
-   * @throws Uncaught exceptions thrown by the provider during initialization.
+   * @throws {Error} If the provider throws an exception during initialization.
    */
   setProviderAndWait(domain: string, provider: Provider): Promise<void>;
   async setProviderAndWait(domainOrProvider?: string | Provider, providerOrUndefined?: Provider): Promise<void> {
@@ -138,6 +138,27 @@ export class OpenFeatureAPI
     return this;
   }
 
+  /**
+   * Get the default provider.
+   *
+   * Note that it isn't recommended to interact with the provider directly, but rather through
+   * an OpenFeature client.
+   * @returns {Provider} Default Provider
+   */
+  getProvider(): Provider;
+  /**
+   * Get the provider bound to the specified domain.
+   *
+   * Note that it isn't recommended to interact with the provider directly, but rather through
+   * an OpenFeature client.
+   * @param {string} domain An identifier which logically binds clients with providers
+   * @returns {Provider} Domain-scoped provider
+   */
+  getProvider(domain?: string): Provider;
+  getProvider(domain?: string): Provider {
+    return this.getProviderForClient(domain);
+  }
+
   setContext(context: EvaluationContext): this {
     this._context = context;
     return this;

packages/server/test/events.spec.ts

@@ -449,7 +449,21 @@ describe('Events', () => {
       expect(OpenFeature.getHandlers(eventType)).toHaveLength(0);
     });
 
-    it('The API provides a function allowing the removal of event handlers', () => {
+    it('The event handler can be removed using an abort signal', () => {
+      const abortController = new AbortController();
+      const handler1 = jest.fn();
+      const handler2 = jest.fn();
+      const eventType = ProviderEvents.Stale;
+
+      OpenFeature.addHandler(eventType, handler1, { signal: abortController.signal });
+      OpenFeature.addHandler(eventType, handler2);
+      expect(OpenFeature.getHandlers(eventType)).toHaveLength(2);
+
+      abortController.abort();
+      expect(OpenFeature.getHandlers(eventType)).toHaveLength(1);
+    });
+
+    it('The API provides a function allowing the removal of event handlers from client', () => {
       const client = OpenFeature.getClient(domain);
       const handler = jest.fn();
       const eventType = ProviderEvents.Stale;
@@ -459,6 +473,21 @@ describe('Events', () => {
       client.removeHandler(eventType, handler);
       expect(client.getHandlers(eventType)).toHaveLength(0);
     });
+
+    it('The event handler on the client can be removed using an abort signal', () => {
+      const abortController = new AbortController();
+      const client = OpenFeature.getClient(domain);
+      const handler1 = jest.fn();
+      const handler2 = jest.fn();
+      const eventType = ProviderEvents.Stale;
+
+      client.addHandler(eventType, handler1, { signal: abortController.signal });
+      client.addHandler(eventType, handler2);
+      expect(client.getHandlers(eventType)).toHaveLength(2);
+
+      abortController.abort();
+      expect(client.getHandlers(eventType)).toHaveLength(1);
+    });
   });
 
   describe('Requirement 5.3.1', () => {

packages/server/test/hooks-data.spec.ts

@@ -0,0 +1,508 @@
+import { OpenFeature } from '../src';
+import type { Client } from '../src/client';
+import type {
+  JsonValue,
+  ResolutionDetails,
+  HookContext,
+  BeforeHookContext,
+  HookData} from '@openfeature/core';
+import {
+  StandardResolutionReasons
+} from '@openfeature/core';
+import type { Provider } from '../src/provider';
+import type { Hook } from '../src/hooks';
+
+const BOOLEAN_VALUE = true;
+const STRING_VALUE = 'val';
+const NUMBER_VALUE = 1;
+const OBJECT_VALUE = { key: 'value' };
+
+// A test hook that stores data in the before stage and retrieves it in after/error/finally
+class TestHookWithData implements Hook {
+  beforeData: unknown;
+  afterData: unknown;
+  errorData: unknown;
+  finallyData: unknown;
+
+  async before(hookContext: BeforeHookContext) {
+    // Store some data
+    hookContext.hookData.set('testKey', 'testValue');
+    hookContext.hookData.set('timestamp', Date.now());
+    hookContext.hookData.set('object', { nested: 'value' });
+    this.beforeData = hookContext.hookData.get('testKey');
+  }
+
+  async after(hookContext: HookContext) {
+    // Retrieve data stored in before
+    this.afterData = hookContext.hookData.get('testKey');
+  }
+
+  async error(hookContext: HookContext) {
+    // Retrieve data stored in before
+    this.errorData = hookContext.hookData.get('testKey');
+  }
+
+  async finally(hookContext: HookContext) {
+    // Retrieve data stored in before
+    this.finallyData = hookContext.hookData.get('testKey');
+  }
+}
+
+// Typed hook example demonstrating improved type safety
+interface OpenTelemetryData {
+  spanId: string;
+  traceId: string;
+  startTime: number;
+  attributes: Record<string, string | number | boolean>;
+}
+
+class TypedOpenTelemetryHook implements Hook {
+  spanId?: string;
+  duration?: number;
+
+  async before(hookContext: BeforeHookContext) {
+    const spanId = `span-${Math.random().toString(36).substring(2, 11)}`;
+    const traceId = `trace-${Math.random().toString(36).substring(2, 11)}`;
+    
+    // Demonstrate that we can cast for type safety while maintaining compatibility
+    const typedHookData = hookContext.hookData as unknown as HookData<OpenTelemetryData>;
+    
+    // Type-safe setting with proper intellisense
+    typedHookData.set('spanId', spanId);
+    typedHookData.set('traceId', traceId);
+    typedHookData.set('startTime', Date.now());
+    typedHookData.set('attributes', {
+      flagKey: hookContext.flagKey,
+      clientName: hookContext.clientMetadata.name || 'unknown',
+      providerName: hookContext.providerMetadata.name,
+    });
+    
+    this.spanId = spanId;
+  }
+
+  async after(hookContext: HookContext) {
+    // Type-safe getting with proper return types
+    const typedHookData = hookContext.hookData as unknown as HookData<OpenTelemetryData>;
+    const startTime: number | undefined = typedHookData.get('startTime');
+    const spanId: string | undefined = typedHookData.get('spanId');
+    
+    if (startTime && spanId) {
+      this.duration = Date.now() - startTime;
+      // Simulate span completion
+    }
+  }
+
+  async error(hookContext: HookContext) {
+    const typedHookData = hookContext.hookData as unknown as HookData<OpenTelemetryData>;
+    const spanId: string | undefined = typedHookData.get('spanId');
+    if (spanId) {
+      // Mark span as error
+    }
+  }
+}
+
+// A timing hook that measures evaluation duration
+class TimingHook implements Hook {
+  duration?: number;
+
+  async before(hookContext: BeforeHookContext) {
+    hookContext.hookData.set('startTime', Date.now());
+  }
+
+  async after(hookContext: HookContext) {
+    const startTime = hookContext.hookData.get('startTime') as number;
+    if (startTime) {
+      this.duration = Date.now() - startTime;
+    }
+  }
+
+  async error(hookContext: HookContext) {
+    const startTime = hookContext.hookData.get('startTime') as number;
+    if (startTime) {
+      this.duration = Date.now() - startTime;
+    }
+  }
+}
+
+// Hook that tests hook data isolation
+class IsolationTestHook implements Hook {
+  hookId: string;
+
+  constructor(id: string) {
+    this.hookId = id;
+  }
+
+  before(hookContext: BeforeHookContext) {
+    const storedId = hookContext.hookData.get('hookId');
+    if (storedId) {
+      throw new Error('Hook data isolation violated! Data is set in before hook.');
+    }
+
+    // Each hook instance should have its own data
+    hookContext.hookData.set('hookId', this.hookId);
+    hookContext.hookData.set(`data_${this.hookId}`, `value_${this.hookId}`);
+  }
+
+  after(hookContext: HookContext) {
+    // Verify we can only see our own data
+    const storedId = hookContext.hookData.get('hookId');
+    if (storedId !== this.hookId) {
+      throw new Error(`Hook data isolation violated! Expected ${this.hookId}, got ${storedId}`);
+    }
+  }
+}
+
+// Mock provider for testing
+const MOCK_PROVIDER: Provider = {
+  metadata: { name: 'mock-provider' },
+  async resolveBooleanEvaluation(): Promise<ResolutionDetails<boolean>> {
+    return {
+      value: BOOLEAN_VALUE,
+      variant: 'default',
+      reason: StandardResolutionReasons.DEFAULT,
+    };
+  },
+  async resolveStringEvaluation(): Promise<ResolutionDetails<string>> {
+    return {
+      value: STRING_VALUE,
+      variant: 'default',
+      reason: StandardResolutionReasons.DEFAULT,
+    };
+  },
+  async resolveNumberEvaluation(): Promise<ResolutionDetails<number>> {
+    return {
+      value: NUMBER_VALUE,
+      variant: 'default',
+      reason: StandardResolutionReasons.DEFAULT,
+    };
+  },
+  async resolveObjectEvaluation<T extends JsonValue>(): Promise<ResolutionDetails<T>> {
+    return {
+      value: OBJECT_VALUE as unknown as T,
+      variant: 'default',
+      reason: StandardResolutionReasons.DEFAULT,
+    };
+  },
+};
+
+// Mock provider that throws an error
+const ERROR_PROVIDER: Provider = {
+  metadata: { name: 'error-provider' },
+  async resolveBooleanEvaluation(): Promise<ResolutionDetails<boolean>> {
+    throw new Error('Provider error');
+  },
+  async resolveStringEvaluation(): Promise<ResolutionDetails<string>> {
+    throw new Error('Provider error');
+  },
+  async resolveNumberEvaluation(): Promise<ResolutionDetails<number>> {
+    throw new Error('Provider error');
+  },
+  async resolveObjectEvaluation<T extends JsonValue>(): Promise<ResolutionDetails<T>> {
+    throw new Error('Provider error');
+  },
+};
+
+describe('Hook Data', () => {
+  let client: Client;
+
+  beforeEach(async () => {
+    OpenFeature.clearHooks();
+    await OpenFeature.setProviderAndWait(MOCK_PROVIDER);
+    client = OpenFeature.getClient();
+  });
+
+  afterEach(async () => {
+    await OpenFeature.clearProviders();
+  });
+
+  describe('Basic Hook Data Functionality', () => {
+    it('should allow hooks to store and retrieve data across stages', async () => {
+      const hook = new TestHookWithData();
+      client.addHooks(hook);
+
+      await client.getBooleanValue('test-flag', false);
+
+      // Verify data was stored in before and retrieved in all other stages
+      expect(hook.beforeData).toBe('testValue');
+      expect(hook.afterData).toBe('testValue');
+      expect(hook.finallyData).toBe('testValue');
+    });
+
+    it('should support storing different data types', async () => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const storedValues: any = {};
+
+      const hook: Hook = {
+        async before(hookContext: BeforeHookContext) {
+          // Store various types
+          hookContext.hookData.set('string', 'test');
+          hookContext.hookData.set('number', 42);
+          hookContext.hookData.set('boolean', true);
+          hookContext.hookData.set('object', { key: 'value' });
+          hookContext.hookData.set('array', [1, 2, 3]);
+          hookContext.hookData.set('null', null);
+          hookContext.hookData.set('undefined', undefined);
+        },
+
+        async after(hookContext: HookContext) {
+          storedValues.string = hookContext.hookData.get('string');
+          storedValues.number = hookContext.hookData.get('number');
+          storedValues.boolean = hookContext.hookData.get('boolean');
+          storedValues.object = hookContext.hookData.get('object');
+          storedValues.array = hookContext.hookData.get('array');
+          storedValues.null = hookContext.hookData.get('null');
+          storedValues.undefined = hookContext.hookData.get('undefined');
+        },
+      };
+
+      client.addHooks(hook);
+      await client.getBooleanValue('test-flag', false);
+
+      expect(storedValues.string).toBe('test');
+      expect(storedValues.number).toBe(42);
+      expect(storedValues.boolean).toBe(true);
+      expect(storedValues.object).toEqual({ key: 'value' });
+      expect(storedValues.array).toEqual([1, 2, 3]);
+      expect(storedValues.null).toBeNull();
+      expect(storedValues.undefined).toBeUndefined();
+    });
+
+    it('should handle hook data in error scenarios', async () => {
+      await OpenFeature.setProviderAndWait(ERROR_PROVIDER);
+      const hook = new TestHookWithData();
+      client.addHooks(hook);
+
+      await client.getBooleanValue('test-flag', false);
+
+      // Verify data was accessible in error and finally stages
+      expect(hook.beforeData).toBe('testValue');
+      expect(hook.errorData).toBe('testValue');
+      expect(hook.finallyData).toBe('testValue');
+      expect(hook.afterData).toBeUndefined(); // after should not run on error
+    });
+  });
+
+  describe('Hook Data API', () => {
+    it('should support has() method', async () => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const hasResults: any = {};
+
+      const hook: Hook = {
+        async before(hookContext: BeforeHookContext) {
+          hookContext.hookData.set('exists', 'value');
+          hasResults.beforeExists = hookContext.hookData.has('exists');
+          hasResults.beforeNotExists = hookContext.hookData.has('notExists');
+        },
+
+        async after(hookContext: HookContext) {
+          hasResults.afterExists = hookContext.hookData.has('exists');
+          hasResults.afterNotExists = hookContext.hookData.has('notExists');
+        },
+      };
+
+      client.addHooks(hook);
+      await client.getBooleanValue('test-flag', false);
+
+      expect(hasResults.beforeExists).toBe(true);
+      expect(hasResults.beforeNotExists).toBe(false);
+      expect(hasResults.afterExists).toBe(true);
+      expect(hasResults.afterNotExists).toBe(false);
+    });
+
+    it('should support delete() method', async () => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const deleteResults: any = {};
+
+      const hook: Hook = {
+        async before(hookContext: BeforeHookContext) {
+          hookContext.hookData.set('toDelete', 'value');
+          deleteResults.hasBeforeDelete = hookContext.hookData.has('toDelete');
+          deleteResults.deleteResult = hookContext.hookData.delete('toDelete');
+          deleteResults.hasAfterDelete = hookContext.hookData.has('toDelete');
+          deleteResults.deleteAgainResult = hookContext.hookData.delete('toDelete');
+        },
+      };
+
+      client.addHooks(hook);
+      await client.getBooleanValue('test-flag', false);
+
+      expect(deleteResults.hasBeforeDelete).toBe(true);
+      expect(deleteResults.deleteResult).toBe(true);
+      expect(deleteResults.hasAfterDelete).toBe(false);
+      expect(deleteResults.deleteAgainResult).toBe(false);
+    });
+
+    it('should support clear() method', async () => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const clearResults: any = {};
+
+      const hook: Hook = {
+        async before(hookContext: BeforeHookContext) {
+          hookContext.hookData.set('key1', 'value1');
+          hookContext.hookData.set('key2', 'value2');
+          hookContext.hookData.set('key3', 'value3');
+          clearResults.hasBeforeClear = hookContext.hookData.has('key1');
+          hookContext.hookData.clear();
+          clearResults.hasAfterClear = hookContext.hookData.has('key1');
+        },
+
+        async after(hookContext: HookContext) {
+          // Verify all data was cleared
+          clearResults.afterHasKey1 = hookContext.hookData.has('key1');
+          clearResults.afterHasKey2 = hookContext.hookData.has('key2');
+          clearResults.afterHasKey3 = hookContext.hookData.has('key3');
+        },
+      };
+
+      client.addHooks(hook);
+      await client.getBooleanValue('test-flag', false);
+
+      expect(clearResults.hasBeforeClear).toBe(true);
+      expect(clearResults.hasAfterClear).toBe(false);
+      expect(clearResults.afterHasKey1).toBe(false);
+      expect(clearResults.afterHasKey2).toBe(false);
+      expect(clearResults.afterHasKey3).toBe(false);
+    });
+  });
+
+  describe('Hook Data Isolation', () => {
+    it('should isolate data between different hook instances', async () => {
+      const hook1 = new IsolationTestHook('hook1');
+      const hook2 = new IsolationTestHook('hook2');
+      const hook3 = new IsolationTestHook('hook3');
+
+      client.addHooks(hook1, hook2, hook3);
+
+      expect(await client.getBooleanValue('test-flag', false)).toBe(true);
+    });
+
+    it('should isolate data between the same hook instance', async () => {
+      const hook = new IsolationTestHook('hook');
+
+      client.addHooks(hook, hook);
+
+      expect(await client.getBooleanValue('test-flag', false)).toBe(true);
+    });
+
+    it('should not share data between different evaluations', async () => {
+      let firstEvalData: unknown;
+      let secondEvalData: unknown;
+
+      const hook: Hook = {
+        async before(hookContext: BeforeHookContext) {
+          // Check if data exists from previous evaluation
+          const existingData = hookContext.hookData.get('evalData');
+          if (existingData) {
+            throw new Error('Hook data leaked between evaluations!');
+          }
+          hookContext.hookData.set('evalData', 'evaluation-specific');
+        },
+
+        async after(hookContext: HookContext) {
+          if (!firstEvalData) {
+            firstEvalData = hookContext.hookData.get('evalData');
+          } else {
+            secondEvalData = hookContext.hookData.get('evalData');
+          }
+        },
+      };
+
+      client.addHooks(hook);
+
+      // First evaluation
+      await client.getBooleanValue('test-flag', false);
+      // Second evaluation
+      await client.getBooleanValue('test-flag', false);
+
+      expect(firstEvalData).toBe('evaluation-specific');
+      expect(secondEvalData).toBe('evaluation-specific');
+    });
+
+    it('should isolate data between global, client, and invocation hooks', async () => {
+      const globalHook = new IsolationTestHook('global');
+      const clientHook = new IsolationTestHook('client');
+      const invocationHook = new IsolationTestHook('invocation');
+
+      OpenFeature.addHooks(globalHook);
+      client.addHooks(clientHook);
+
+      expect(await client.getBooleanValue('test-flag', false, {}, { hooks: [invocationHook] })).toBe(true);
+    });
+  });
+
+  describe('Use Cases', () => {
+    it('should support timing measurements', async () => {
+      const timingHook = new TimingHook();
+      client.addHooks(timingHook);
+
+      await client.getBooleanValue('test-flag', false);
+
+      expect(timingHook.duration).toBeDefined();
+      expect(timingHook.duration).toBeGreaterThanOrEqual(0);
+    });
+
+    it('should support multi-stage validation accumulation', async () => {
+      let finalErrors: string[] = [];
+
+      const validationHook: Hook = {
+        async before(hookContext: BeforeHookContext) {
+          hookContext.hookData.set('errors', []);
+
+          // Simulate validation
+          const errors = hookContext.hookData.get('errors') as string[];
+          if (!hookContext.context.userId) {
+            errors.push('Missing userId');
+          }
+          if (!hookContext.context.region) {
+            errors.push('Missing region');
+          }
+        },
+
+        async finally(hookContext: HookContext) {
+          finalErrors = (hookContext.hookData.get('errors') as string[]) || [];
+        },
+      };
+
+      client.addHooks(validationHook);
+      await client.getBooleanValue('test-flag', false, {});
+
+      expect(finalErrors).toContain('Missing userId');
+      expect(finalErrors).toContain('Missing region');
+    });
+
+    it('should support request correlation', async () => {
+      let correlationId: string | undefined;
+
+      const correlationHook: Hook = {
+        async before(hookContext: BeforeHookContext) {
+          const id = `req-${Date.now()}-${Math.random()}`;
+          hookContext.hookData.set('correlationId', id);
+        },
+
+        async after(hookContext: HookContext) {
+          correlationId = hookContext.hookData.get('correlationId') as string;
+        },
+      };
+
+      client.addHooks(correlationHook);
+      await client.getBooleanValue('test-flag', false);
+
+      expect(correlationId).toBeDefined();
+      expect(correlationId).toMatch(/^req-\d+-[\d.]+$/);
+    });
+
+    it('should support typed hook data for better type safety', async () => {
+      const typedHook = new TypedOpenTelemetryHook();
+      client.addHooks(typedHook);
+
+      await client.getBooleanValue('test-flag', false);
+
+      // Verify the typed hook worked correctly
+      expect(typedHook.spanId).toBeDefined();
+      expect(typedHook.spanId).toMatch(/^span-[a-z0-9]+$/);
+      expect(typedHook.duration).toBeDefined();
+      expect(typeof typedHook.duration).toBe('number');
+      expect(typedHook.duration).toBeGreaterThanOrEqual(0);
+    });
+  });
+});

packages/server/test/open-feature.spec.ts

@@ -74,8 +74,8 @@ describe('OpenFeature', () => {
     it('should set the default provider if no domain is provided', () => {
       const provider = mockProvider();
       OpenFeature.setProvider(provider);
-      const client = OpenFeature.getClient();
+      const registeredProvider = OpenFeature.getProvider();
-      expect(client.metadata.providerMetadata.name).toEqual(provider.metadata.name);
+      expect(registeredProvider).toEqual(provider);
     });
 
     it('should not change providers associated with a domain when setting a new default provider', () => {
@@ -85,11 +85,11 @@ describe('OpenFeature', () => {
       OpenFeature.setProvider(provider);
       OpenFeature.setProvider(domain, fakeProvider);
 
-      const defaultClient = OpenFeature.getClient();
+      const defaultProvider = OpenFeature.getProvider();
-      const domainSpecificClient = OpenFeature.getClient(domain);
+      const domainSpecificProvider = OpenFeature.getProvider(domain);
 
-      expect(defaultClient.metadata.providerMetadata.name).toEqual(provider.metadata.name);
+      expect(defaultProvider).toEqual(provider);
-      expect(domainSpecificClient.metadata.providerMetadata.name).toEqual(fakeProvider.metadata.name);
+      expect(domainSpecificProvider).toEqual(fakeProvider);
     });
 
     it('should bind a new provider to existing clients in a matching domain', () => {

packages/shared/CHANGELOG.md

@@ -1,5 +1,41 @@
 # Changelog 
 
+## [1.9.0](https://github.com/open-feature/js-sdk/compare/core-v1.8.1...core-v1.9.0) (2025-08-10)
+
+
+### ✨ New Features
+
+* add evaluation-scoped hook data ([#1216](https://github.com/open-feature/js-sdk/issues/1216)) ([07af3a9](https://github.com/open-feature/js-sdk/commit/07af3a9eda895e9edb24c7ee1e3c1c4f16e17431))
+* support Angular 20 ([#1220](https://github.com/open-feature/js-sdk/issues/1220)) ([aa232a9](https://github.com/open-feature/js-sdk/commit/aa232a9d6a8dfa416380ccdecd71843d3e361048))
+
+## [1.8.1](https://github.com/open-feature/js-sdk/compare/core-v1.8.0...core-v1.8.1) (2025-06-04)
+
+
+### 🔄 Refactoring
+
+* **telemetry:** update telemetry attributes and remove unused evaluation data ([#1189](https://github.com/open-feature/js-sdk/issues/1189)) ([3e6bcae](https://github.com/open-feature/js-sdk/commit/3e6bcaef0bb5c05e914a0078f0cb884b7f74f068))
+
+## [1.8.0](https://github.com/open-feature/js-sdk/compare/core-v1.7.2...core-v1.8.0) (2025-04-10)
+
+
+### ✨ New Features
+
+* add support for abort controllers to event handlers ([#1151](https://github.com/open-feature/js-sdk/issues/1151)) ([6a22483](https://github.com/open-feature/js-sdk/commit/6a224830fa4e62fc30a7802536f6f6fc3f772038))
+
+## [1.7.2](https://github.com/open-feature/js-sdk/compare/core-v1.7.1...core-v1.7.2) (2025-02-18)
+
+
+### 🐛 Bug Fixes
+
+* rename evaluation event property from data to body ([4c2b01e](https://github.com/open-feature/js-sdk/commit/4c2b01e36773091038d758ac10bba06056ff4c45))
+
+## [1.7.1](https://github.com/open-feature/js-sdk/compare/core-v1.7.0...core-v1.7.1) (2025-02-13)
+
+
+### 🐛 Bug Fixes
+
+* export missing telemetry functionality ([#1148](https://github.com/open-feature/js-sdk/issues/1148)) ([dcbc300](https://github.com/open-feature/js-sdk/commit/dcbc30090e7611c60e06d05826f6471f0c8c4009))
+
 ## [1.7.0](https://github.com/open-feature/js-sdk/compare/core-v1.6.0...core-v1.7.0) (2025-02-07)
 
 

packages/shared/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@openfeature/core",
-  "version": "1.7.0",
+  "version": "1.9.0",
   "description": "Shared OpenFeature JS components (server and web)",
   "main": "./dist/cjs/index.js",
   "files": [

packages/shared/src/errors/open-feature-error-abstract.ts

@@ -18,3 +18,4 @@ export abstract class OpenFeatureError extends Error {
     this.cause = options?.cause;
   }
 }
+

packages/shared/src/evaluation/evaluation.ts

@@ -3,7 +3,7 @@ import type { JsonValue } from '../types/structure';
 export type FlagValueType = 'boolean' | 'string' | 'number' | 'object';
 
 /**
- * Represents a JSON node value, or Date.
+ * Represents a JSON node value.
  */
 export type FlagValue = boolean | string | number | JsonValue;
 

packages/shared/src/events/eventing.ts

@@ -66,6 +66,9 @@ export type EventDetails<
 export type EventHandler<
   T extends ServerProviderEvents | ClientProviderEvents = ServerProviderEvents | ClientProviderEvents,
 > = (eventDetails?: EventDetails<T>) => Promise<unknown> | unknown;
+export type EventOptions = {
+  signal?: AbortSignal;
+};
 
 export interface Eventing<T extends ServerProviderEvents | ClientProviderEvents> {
   /**
@@ -73,6 +76,7 @@ export interface Eventing<T extends ServerProviderEvents | ClientProviderEvents>
    * The handlers are called in the order they have been added.
    * @param eventType The provider event type to listen to
    * @param {EventHandler} handler The handler to run on occurrence of the event type
+   * @param {EventOptions} options Optional options such as signal for aborting
    */
   addHandler(
     eventType: T extends ClientProviderEvents
@@ -83,14 +87,17 @@ export interface Eventing<T extends ServerProviderEvents | ClientProviderEvents>
         ? ClientProviderEvents.ConfigurationChanged
         : ServerProviderEvents.ConfigurationChanged
     >,
+    options?: EventOptions,
   ): void;
   addHandler(
     eventType: T extends ClientProviderEvents ? ClientNotChangeEvents : ServerNotChangeEvents,
     handler: EventHandler<T extends ClientProviderEvents ? ClientNotChangeEvents : ServerNotChangeEvents>,
+    options?: EventOptions,
   ): void;
   addHandler(
     eventType: T extends ClientProviderEvents ? ClientProviderEvents : ServerProviderEvents,
     handler: EventHandler<T extends ClientProviderEvents ? ClientProviderEvents : ServerProviderEvents>,
+    options?: EventOptions,
   ): void;
 
   /**

packages/shared/src/hooks/hook-data.ts

@@ -0,0 +1,72 @@
+/**
+ * A mutable data structure for hooks to maintain state across their lifecycle.
+ * Each hook instance gets its own isolated data store that persists for the
+ * duration of a single flag evaluation.
+ * @template TData - A record type that defines the shape of the stored data
+ */
+export interface HookData<TData = Record<string, unknown>> {
+  /**
+   * Sets a value in the hook data store.
+   * @param key The key to store the value under
+   * @param value The value to store
+   */
+  set<K extends keyof TData>(key: K, value: TData[K]): void;
+  set(key: string, value: unknown): void;
+
+  /**
+   * Gets a value from the hook data store.
+   * @param key The key to retrieve the value for
+   * @returns The stored value, or undefined if not found
+   */
+  get<K extends keyof TData>(key: K): TData[K] | undefined;
+  get(key: string): unknown;
+
+  /**
+   * Checks if a key exists in the hook data store.
+   * @param key The key to check
+   * @returns True if the key exists, false otherwise
+   */
+  has<K extends keyof TData>(key: K): boolean;
+  has(key: string): boolean;
+
+  /**
+   * Deletes a value from the hook data store.
+   * @param key The key to delete
+   * @returns True if the key was deleted, false if it didn't exist
+   */
+  delete<K extends keyof TData>(key: K): boolean;
+  delete(key: string): boolean;
+
+  /**
+   * Clears all values from the hook data store.
+   */
+  clear(): void;
+}
+
+/**
+ * Default implementation of HookData using a Map.
+ * @template TData - A record type that defines the shape of the stored data
+ */
+export class MapHookData<TData = Record<string, unknown>> implements HookData<TData> {
+  private readonly data = new Map<keyof TData, TData[keyof TData]>();
+
+  set<K extends keyof TData>(key: K, value: TData[K]): void {
+    this.data.set(key, value);
+  }
+
+  get<K extends keyof TData>(key: K): TData[K] | undefined {
+    return this.data.get(key) as TData[K] | undefined;
+  }
+
+  has<K extends keyof TData>(key: K): boolean {
+    return this.data.has(key);
+  }
+
+  delete<K extends keyof TData>(key: K): boolean {
+    return this.data.delete(key);
+  }
+
+  clear(): void {
+    this.data.clear();
+  }
+}

packages/shared/src/hooks/hook.ts

@@ -1,14 +1,19 @@
 import type { BeforeHookContext, HookContext, HookHints } from './hooks';
 import type { EvaluationDetails, FlagValue } from '../evaluation';
 
-export interface BaseHook<T extends FlagValue = FlagValue, BeforeHookReturn = unknown, HooksReturn = unknown> {
+export interface BaseHook<
+  T extends FlagValue = FlagValue, 
+  TData = Record<string, unknown>,
+  BeforeHookReturn = unknown, 
+  HooksReturn = unknown
+> {
   /**
    * Runs before flag values are resolved from the provider.
    * If an EvaluationContext is returned, it will be merged with the pre-existing EvaluationContext.
    * @param hookContext
    * @param hookHints
    */
-  before?(hookContext: BeforeHookContext, hookHints?: HookHints): BeforeHookReturn;
+  before?(hookContext: BeforeHookContext<T, TData>, hookHints?: HookHints): BeforeHookReturn;
 
   /**
    * Runs after flag values are successfully resolved from the provider.
@@ -17,7 +22,7 @@ export interface BaseHook<T extends FlagValue = FlagValue, BeforeHookReturn = un
    * @param hookHints
    */
   after?(
-    hookContext: Readonly<HookContext<T>>,
+    hookContext: Readonly<HookContext<T, TData>>,
     evaluationDetails: EvaluationDetails<T>,
     hookHints?: HookHints,
   ): HooksReturn;
@@ -28,7 +33,7 @@ export interface BaseHook<T extends FlagValue = FlagValue, BeforeHookReturn = un
    * @param error
    * @param hookHints
    */
-  error?(hookContext: Readonly<HookContext<T>>, error: unknown, hookHints?: HookHints): HooksReturn;
+  error?(hookContext: Readonly<HookContext<T, TData>>, error: unknown, hookHints?: HookHints): HooksReturn;
 
   /**
    * Runs after all other hook stages, regardless of success or error.
@@ -37,8 +42,9 @@ export interface BaseHook<T extends FlagValue = FlagValue, BeforeHookReturn = un
    * @param hookHints
    */
   finally?(
-    hookContext: Readonly<HookContext<T>>,
+    hookContext: Readonly<HookContext<T, TData>>,
     evaluationDetails: EvaluationDetails<T>,
     hookHints?: HookHints,
   ): HooksReturn;
 }
+

packages/shared/src/hooks/hooks.ts

@@ -2,10 +2,11 @@ import type { ProviderMetadata } from '../provider';
 import type { ClientMetadata } from '../client';
 import type { EvaluationContext, FlagValue, FlagValueType } from '../evaluation';
 import type { Logger } from '../logger';
+import type { HookData } from './hook-data';
 
 export type HookHints = Readonly<Record<string, unknown>>;
 
-export interface HookContext<T extends FlagValue = FlagValue> {
+export interface HookContext<T extends FlagValue = FlagValue, TData = Record<string, unknown>> {
   readonly flagKey: string;
   readonly defaultValue: T;
   readonly flagValueType: FlagValueType;
@@ -13,8 +14,9 @@ export interface HookContext<T extends FlagValue = FlagValue> {
   readonly clientMetadata: ClientMetadata;
   readonly providerMetadata: ProviderMetadata;
   readonly logger: Logger;
+  readonly hookData: HookData<TData>;
 }
 
-export interface BeforeHookContext extends HookContext {
+export interface BeforeHookContext<T extends FlagValue = FlagValue, TData = Record<string, unknown>> extends HookContext<T, TData> {
   context: EvaluationContext;
 }

packages/shared/src/hooks/index.ts

@@ -1,3 +1,4 @@
 export * from './hook';
 export * from './hooks';
 export * from './evaluation-lifecycle';
+export * from './hook-data';

packages/shared/src/index.ts

@@ -4,6 +4,7 @@ export * from './client';
 export * from './errors';
 export * from './events';
 export * from './logger';
+export * from './telemetry';
 export * from './provider';
 export * from './evaluation';
 export * from './type-guards';

packages/shared/src/open-feature.ts

@@ -7,14 +7,13 @@ import type {
   EventDetails,
   EventHandler,
   Eventing,
-  GenericEventEmitter} from './events';
+  EventOptions,
-import {
+  GenericEventEmitter,
-  AllProviderEvents,
-  statusMatchesEvent,
 } from './events';
+import { AllProviderEvents, statusMatchesEvent } from './events';
 import { isDefined } from './filter';
 import type { BaseHook, EvaluationLifeCycle } from './hooks';
-import type { Logger, ManageLogger} from './logger';
+import type { Logger, ManageLogger } from './logger';
 import { DefaultLogger, SafeLogger } from './logger';
 import type { ClientProviderStatus, CommonProvider, ProviderMetadata, ServerProviderStatus } from './provider';
 import { objectOrUndefined, stringOrUndefined } from './type-guards';
@@ -154,8 +153,9 @@ export abstract class OpenFeatureCommonAPI<
    * API (global) events run for all providers.
    * @param {AnyProviderEvent} eventType The provider event type to listen to
    * @param {EventHandler} handler The handler to run on occurrence of the event type
+   * @param {EventOptions} options Optional options such as signal for aborting
    */
-  addHandler<T extends AnyProviderEvent>(eventType: T, handler: EventHandler): void {
+  addHandler<T extends AnyProviderEvent>(eventType: T, handler: EventHandler, options?: EventOptions): void {
     [...new Map([[undefined, this._defaultProvider]]), ...this._domainScopedProviders].forEach((keyProviderTuple) => {
       const domain = keyProviderTuple[0];
       const provider = keyProviderTuple[1].provider;
@@ -173,6 +173,11 @@ export abstract class OpenFeatureCommonAPI<
     });
 
     this._apiEmitter.addHandler(eventType, handler);
+    if (options?.signal && typeof options.signal.addEventListener === 'function') {
+      options.signal.addEventListener('abort', () => {
+        this.removeHandler(eventType, handler);
+      });
+    }
   }
 
   /**
@@ -248,7 +253,7 @@ export abstract class OpenFeatureCommonAPI<
     // initialize the provider if it implements "initialize" and it's not already registered
     if (typeof provider.initialize === 'function' && !this.allProviders.includes(provider)) {
       initializationPromise = provider
-        .initialize?.(domain ? this._domainScopedContext.get(domain) ?? this._context : this._context)
+        .initialize?.(domain ? (this._domainScopedContext.get(domain) ?? this._context) : this._context)
         ?.then(() => {
           wrappedProvider.status = this._statusEnumType.READY;
           // fetch the most recent event emitters, some may have been added during init

packages/shared/src/telemetry/attributes.ts

@@ -20,6 +20,14 @@ export const TelemetryAttribute = {
    * - example: `flag_not_found`
    */
   ERROR_CODE: 'error.type',
+  /**
+   * A message explaining the nature of an error occurring during flag evaluation.
+   *
+   * - type: `string`
+   * - requirement level: `recommended`
+   * - example: `Flag not found`
+   */
+  ERROR_MESSAGE: 'error.message',
   /**
    * A semantic identifier for an evaluated flag value.
    *
@@ -28,7 +36,16 @@ export const TelemetryAttribute = {
    * - condition: variant is defined on the evaluation details
    * - example: `blue`; `on`; `true`
    */
-  VARIANT: 'feature_flag.variant',
+  VARIANT: 'feature_flag.result.variant',
+  /**
+   * The evaluated value of the feature flag.
+   *
+   * - type: `undefined`
+   * - requirement level: `conditionally required`
+   * - condition: variant is not defined on the evaluation details
+   * - example: `#ff0000`; `1`; `true`
+   */
+  VALUE: 'feature_flag.result.value',
   /**
    * The unique identifier for the flag evaluation context. For example, the targeting key.
    *
@@ -37,14 +54,6 @@ export const TelemetryAttribute = {
    * - example: `5157782b-2203-4c80-a857-dbbd5e7761db`
    */
   CONTEXT_ID: 'feature_flag.context.id',
-  /**
-   * A message explaining the nature of an error occurring during flag evaluation.
-   *
-   * - type: `string`
-   * - requirement level: `recommended`
-   * - example: `Flag not found`
-   */
-  ERROR_MESSAGE: 'feature_flag.evaluation.error.message',
   /**
    * The reason code which shows how a feature flag value was determined.
    *
@@ -52,7 +61,7 @@ export const TelemetryAttribute = {
    * - requirement level: `recommended`
    * - example: `targeting_match`
    */
-  REASON: 'feature_flag.evaluation.reason',
+  REASON: 'feature_flag.result.reason',
   /**
    * Describes a class of error the operation ended with.
    *
@@ -60,7 +69,7 @@ export const TelemetryAttribute = {
    * - requirement level: `recommended`
    * - example: `flag_not_found`
    */
-  PROVIDER: 'feature_flag.provider_name',
+  PROVIDER: 'feature_flag.provider.name',
   /**
    * The identifier of the flag set to which the feature flag belongs.
    *

packages/shared/src/telemetry/evaluation-data.ts

@@ -1,17 +0,0 @@
-/**
- * Event data, sometimes referred as "body", is specific to a specific event.
- * In this case, the event is `feature_flag.evaluation`. That's why the prefix
- * is omitted from the values.
- * @see https://opentelemetry.io/docs/specs/semconv/feature-flags/feature-flags-logs/
- */
-export const TelemetryEvaluationData = {
-  /**
-   * The evaluated value of the feature flag.
-   *
-   * - type: `undefined`
-   * - requirement level: `conditionally required`
-   * - condition: variant is not defined on the evaluation details
-   * - example: `#ff0000`; `1`; `true`
-   */
-  VALUE: 'value',
-} as const;

packages/shared/src/telemetry/evaluation-event.ts

@@ -1,14 +1,19 @@
 import { ErrorCode, StandardResolutionReasons, type EvaluationDetails, type FlagValue } from '../evaluation/evaluation';
 import type { HookContext } from '../hooks/hooks';
-import type { JsonValue } from '../types';
 import { TelemetryAttribute } from './attributes';
-import { TelemetryEvaluationData } from './evaluation-data';
 import { TelemetryFlagMetadata } from './flag-metadata';
 
 type EvaluationEvent = {
+  /**
+   * The name of the feature flag evaluation event.
+   */
   name: string;
-  attributes: Record<string, string | number | boolean>;
+  /**
-  data: Record<string, JsonValue>;
+   * The attributes of an OpenTelemetry compliant event for flag evaluation.
+   * @experimental The attributes are subject to change.
+   * @see https://opentelemetry.io/docs/specs/semconv/feature-flags/feature-flags-logs/
+   */
+  attributes: Record<string, string | number | boolean | FlagValue>;
 };
 
 const FLAG_EVALUATION_EVENT_NAME = 'feature_flag.evaluation';
@@ -28,12 +33,11 @@ export function createEvaluationEvent(
     [TelemetryAttribute.PROVIDER]: hookContext.providerMetadata.name,
     [TelemetryAttribute.REASON]: (evaluationDetails.reason ?? StandardResolutionReasons.UNKNOWN).toLowerCase(),
   };
-  const data: EvaluationEvent['data'] = {};
 
   if (evaluationDetails.variant) {
     attributes[TelemetryAttribute.VARIANT] = evaluationDetails.variant;
   } else {
-    data[TelemetryEvaluationData.VALUE] = evaluationDetails.value;
+    attributes[TelemetryAttribute.VALUE] = evaluationDetails.value;
   }
 
   const contextId =
@@ -62,6 +66,5 @@ export function createEvaluationEvent(
   return {
     name: FLAG_EVALUATION_EVENT_NAME,
     attributes,
-    data,
   };
 }

packages/shared/src/telemetry/index.ts

@@ -1,4 +1,3 @@
 export * from './attributes';
-export * from './evaluation-data';
 export * from './flag-metadata';
 export * from './evaluation-event';

packages/shared/test/events.spec.ts

@@ -17,14 +17,20 @@ class TestEventEmitter extends GenericEventEmitter<AnyProviderEvent> {
 // a little function to make sure we're at least waiting for the event loop
 // to clear before we start making assertions
 const wait = (millis = 0) => {
-  return new Promise(resolve => {setTimeout(resolve, millis);});
+  return new Promise((resolve) => {
+    setTimeout(resolve, millis);
+  });
 };
 
 describe('GenericEventEmitter', () => {
+  const emitter = new TestEventEmitter();
+
+  afterEach(() => {
+    emitter.removeAllHandlers();
+  });
+
   describe('addHandler should', function () {
     it('attach handler for event type', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler1 = jest.fn();
       emitter.addHandler(AllProviderEvents.Ready, handler1);
       emitter.emit(AllProviderEvents.Ready);
@@ -35,8 +41,6 @@ describe('GenericEventEmitter', () => {
     });
 
     it('attach several handlers for event type', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler1 = jest.fn();
       const handler2 = jest.fn();
       const handler3 = jest.fn();
@@ -64,7 +68,6 @@ describe('GenericEventEmitter', () => {
         debug: () => done(),
       };
 
-      const emitter = new TestEventEmitter();
       emitter.setLogger(logger);
 
       emitter.addHandler(AllProviderEvents.Ready, async () => {
@@ -74,8 +77,6 @@ describe('GenericEventEmitter', () => {
     });
 
     it('trigger handler for event type', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler1 = jest.fn();
       emitter.addHandler(AllProviderEvents.Ready, handler1);
       emitter.emit(AllProviderEvents.Ready);
@@ -87,7 +88,6 @@ describe('GenericEventEmitter', () => {
 
     it('trigger handler for event type with event data', async function () {
       const event: ReadyEvent = { message: 'message' };
-      const emitter = new TestEventEmitter();
 
       const handler1 = jest.fn();
       emitter.addHandler(AllProviderEvents.Ready, handler1);
@@ -99,8 +99,6 @@ describe('GenericEventEmitter', () => {
     });
 
     it('trigger several handlers for event type', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler1 = jest.fn();
       const handler2 = jest.fn();
       const handler3 = jest.fn();
@@ -121,8 +119,6 @@ describe('GenericEventEmitter', () => {
 
   describe('removeHandler should', () => {
     it('remove single handler', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler1 = jest.fn();
       emitter.addHandler(AllProviderEvents.Ready, handler1);
 
@@ -138,8 +134,6 @@ describe('GenericEventEmitter', () => {
 
   describe('removeAllHandlers should', () => {
     it('remove all handlers for event type', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler1 = jest.fn();
       const handler2 = jest.fn();
       emitter.addHandler(AllProviderEvents.Ready, handler1);
@@ -156,8 +150,6 @@ describe('GenericEventEmitter', () => {
     });
 
     it('remove same handler when assigned to multiple events', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler = jest.fn();
       emitter.addHandler(AllProviderEvents.Stale, handler);
       emitter.addHandler(AllProviderEvents.ContextChanged, handler);
@@ -174,8 +166,6 @@ describe('GenericEventEmitter', () => {
     });
 
     it('allow addition/removal of duplicate handlers', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler = jest.fn();
       emitter.addHandler(AllProviderEvents.Stale, handler);
       emitter.addHandler(AllProviderEvents.Stale, handler);
@@ -191,8 +181,6 @@ describe('GenericEventEmitter', () => {
     });
 
     it('allow duplicate event handlers and call them', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler = jest.fn();
       emitter.addHandler(AllProviderEvents.Stale, handler);
       emitter.addHandler(AllProviderEvents.Stale, handler);
@@ -205,8 +193,6 @@ describe('GenericEventEmitter', () => {
     });
 
     it('remove all handlers only for event type', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler1 = jest.fn();
       const handler2 = jest.fn();
       emitter.addHandler(AllProviderEvents.Ready, handler1);
@@ -223,8 +209,6 @@ describe('GenericEventEmitter', () => {
     });
 
     it('remove all handlers if no event type is given', async function () {
-      const emitter = new TestEventEmitter();
-
       const handler1 = jest.fn();
       const handler2 = jest.fn();
       emitter.addHandler(AllProviderEvents.Ready, handler1);

packages/shared/test/hook-data-types.spec.ts

@@ -0,0 +1,214 @@
+import type { HookData, BaseHook, BeforeHookContext, HookContext } from '../src/hooks';
+import { MapHookData } from '../src/hooks';
+import type { FlagValue } from '../src/evaluation';
+
+describe('Hook Data Type Safety', () => {
+  it('should provide type safety with typed hook data', () => {
+    // Define a strict type for hook data
+    interface MyHookData {
+      startTime: number;
+      userId: string;
+      metadata: { version: string; feature: boolean };
+      tags: string[];
+    }
+
+    const hookData = new MapHookData<MyHookData>();
+
+    // Type-safe setting and getting
+    hookData.set('startTime', 123456);
+    hookData.set('userId', 'user-123');
+    hookData.set('metadata', { version: '1.0.0', feature: true });
+    hookData.set('tags', ['tag1', 'tag2']);
+
+    // TypeScript should infer the correct return types
+    const startTime: number | undefined = hookData.get('startTime');
+    const userId: string | undefined = hookData.get('userId');
+    const metadata: { version: string; feature: boolean } | undefined = hookData.get('metadata');
+    const tags: string[] | undefined = hookData.get('tags');
+
+    // Verify the values
+    expect(startTime).toBe(123456);
+    expect(userId).toBe('user-123');
+    expect(metadata).toEqual({ version: '1.0.0', feature: true });
+    expect(tags).toEqual(['tag1', 'tag2']);
+
+    // Type-safe existence checks
+    expect(hookData.has('startTime')).toBe(true);
+    expect(hookData.has('userId')).toBe(true);
+    expect(hookData.has('metadata')).toBe(true);
+    expect(hookData.has('tags')).toBe(true);
+
+    // Type-safe deletion
+    expect(hookData.delete('tags')).toBe(true);
+    expect(hookData.has('tags')).toBe(false);
+  });
+
+  it('should support untyped usage for backward compatibility', () => {
+    const hookData: HookData = new MapHookData();
+
+    // Untyped usage still works
+    hookData.set('anyKey', 'anyValue');
+    hookData.set('numberKey', 42);
+    hookData.set('objectKey', { nested: true });
+
+    const value: unknown = hookData.get('anyKey');
+    const numberValue: unknown = hookData.get('numberKey');
+    const objectValue: unknown = hookData.get('objectKey');
+
+    expect(value).toBe('anyValue');
+    expect(numberValue).toBe(42);
+    expect(objectValue).toEqual({ nested: true });
+  });
+
+  it('should support mixed usage with typed and untyped keys', () => {
+    interface PartiallyTypedData {
+      correlationId: string;
+      timestamp: number;
+    }
+
+    const hookData: HookData<PartiallyTypedData> = new MapHookData<PartiallyTypedData>();
+
+    // Typed usage
+    hookData.set('correlationId', 'abc-123');
+    hookData.set('timestamp', Date.now());
+
+    // Untyped usage for additional keys
+    hookData.set('dynamicKey', 'dynamicValue');
+
+    // Type-safe retrieval for typed keys
+    const correlationId: string | undefined = hookData.get('correlationId');
+    const timestamp: number | undefined = hookData.get('timestamp');
+
+    // Untyped retrieval for dynamic keys
+    const dynamicValue: unknown = hookData.get('dynamicKey');
+
+    expect(correlationId).toBe('abc-123');
+    expect(typeof timestamp).toBe('number');
+    expect(dynamicValue).toBe('dynamicValue');
+  });
+
+  it('should work with complex nested types', () => {
+    interface ComplexHookData {
+      request: {
+        id: string;
+        headers: Record<string, string>;
+        body?: { [key: string]: unknown };
+      };
+      response: {
+        status: number;
+        data: unknown;
+        headers: Record<string, string>;
+      };
+      metrics: {
+        startTime: number;
+        endTime?: number;
+        duration?: number;
+      };
+    }
+
+    const hookData: HookData<ComplexHookData> = new MapHookData<ComplexHookData>();
+
+    const requestData = {
+      id: 'req-123',
+      headers: { 'Content-Type': 'application/json' },
+      body: { flag: 'test-flag' },
+    };
+
+    hookData.set('request', requestData);
+    hookData.set('metrics', { startTime: Date.now() });
+
+    const retrievedRequest = hookData.get('request');
+    const retrievedMetrics = hookData.get('metrics');
+
+    expect(retrievedRequest).toEqual(requestData);
+    expect(retrievedMetrics?.startTime).toBeDefined();
+    expect(typeof retrievedMetrics?.startTime).toBe('number');
+  });
+
+  it('should support generic type inference', () => {
+    // This function demonstrates how the generic types work in practice
+    function createTypedHookData<T>(): HookData<T> {
+      return new MapHookData<T>();
+    }
+
+    interface TimingData {
+      start: number;
+      checkpoint: number;
+    }
+
+    const timingHookData = createTypedHookData<TimingData>();
+
+    timingHookData.set('start', performance.now());
+    timingHookData.set('checkpoint', performance.now());
+
+    const start: number | undefined = timingHookData.get('start');
+    const checkpoint: number | undefined = timingHookData.get('checkpoint');
+
+    expect(typeof start).toBe('number');
+    expect(typeof checkpoint).toBe('number');
+  });
+
+  it('should work with BaseHook interface without casting', () => {
+    interface TestHookData {
+      testId: string;
+      startTime: number;
+      metadata: { version: string };
+    }
+
+    class TestTypedHook implements BaseHook<FlagValue, TestHookData> {
+      capturedData: { testId?: string; duration?: number } = {};
+
+      before(hookContext: BeforeHookContext<FlagValue, TestHookData>) {
+        // No casting needed - TypeScript knows the types
+        hookContext.hookData.set('testId', 'test-123');
+        hookContext.hookData.set('startTime', Date.now());
+        hookContext.hookData.set('metadata', { version: '1.0.0' });
+      }
+
+      after(hookContext: HookContext<FlagValue, TestHookData>) {
+        // Type-safe getting with proper return types
+        const testId: string | undefined = hookContext.hookData.get('testId');
+        const startTime: number | undefined = hookContext.hookData.get('startTime');
+
+        if (testId && startTime) {
+          this.capturedData = {
+            testId,
+            duration: Date.now() - startTime,
+          };
+        }
+      }
+    }
+
+    const hook = new TestTypedHook();
+
+    // Create mock contexts that satisfy the BaseHook interface
+    const mockBeforeContext: BeforeHookContext<FlagValue, TestHookData> = {
+      flagKey: 'test-flag',
+      defaultValue: true,
+      flagValueType: 'boolean',
+      context: {},
+      clientMetadata: {
+        name: 'test-client',
+        domain: 'test-domain',
+        providerMetadata: { name: 'test-provider' },
+      },
+      providerMetadata: { name: 'test-provider' },
+      logger: { debug: jest.fn(), info: jest.fn(), warn: jest.fn(), error: jest.fn() },
+      hookData: new MapHookData<TestHookData>(),
+    };
+
+    const mockAfterContext: HookContext<FlagValue, TestHookData> = {
+      ...mockBeforeContext,
+      context: Object.freeze({}),
+    };
+
+    // Execute the hook methods
+    hook.before!(mockBeforeContext);
+    hook.after!(mockAfterContext);
+
+    // Verify the typed hook worked correctly
+    expect(hook.capturedData.testId).toBe('test-123');
+    expect(hook.capturedData.duration).toBeDefined();
+    expect(typeof hook.capturedData.duration).toBe('number');
+  });
+});

packages/shared/test/telemetry.spec.ts

@@ -1,7 +1,8 @@
 import { createEvaluationEvent } from '../src/telemetry/evaluation-event';
 import { ErrorCode, StandardResolutionReasons, type EvaluationDetails } from '../src/evaluation/evaluation';
 import type { HookContext } from '../src/hooks/hooks';
-import { TelemetryAttribute, TelemetryFlagMetadata, TelemetryEvaluationData } from '../src/telemetry';
+import { TelemetryAttribute, TelemetryFlagMetadata } from '../src/telemetry';
+import { MapHookData } from '../src/hooks/hook-data';
 
 describe('evaluationEvent', () => {
   const flagKey = 'test-flag';
@@ -25,6 +26,7 @@ describe('evaluationEvent', () => {
       error: jest.fn(),
       warn: jest.fn(),
     },
+    hookData: new MapHookData(),
   };
 
   it('should return basic event body with mandatory fields', () => {
@@ -43,9 +45,7 @@ describe('evaluationEvent', () => {
       [TelemetryAttribute.PROVIDER]: 'test-provider',
       [TelemetryAttribute.REASON]: StandardResolutionReasons.STATIC.toLowerCase(),
       [TelemetryAttribute.CONTEXT_ID]: 'test-target',
-    });
+      [TelemetryAttribute.VALUE]: true,
-    expect(result.data).toEqual({
-      [TelemetryEvaluationData.VALUE]: true,
     });
   });
 
@@ -61,7 +61,7 @@ describe('evaluationEvent', () => {
     const result = createEvaluationEvent(mockHookContext, details);
 
     expect(result.attributes[TelemetryAttribute.VARIANT]).toBe('test-variant');
-    expect(result.attributes[TelemetryEvaluationData.VALUE]).toBeUndefined();
+    expect(result.attributes[TelemetryAttribute.VALUE]).toBeUndefined();
   });
 
   it('should include flag metadata when provided', () => {

packages/web/CHANGELOG.md

@@ -1,6 +1,51 @@
 # Changelog
 
 
+## [1.6.1](https://github.com/open-feature/js-sdk/compare/web-sdk-v1.6.0...web-sdk-v1.6.1) (2025-08-14)
+
+
+### 🐛 Bug Fixes
+
+* update core dep ([#1228](https://github.com/open-feature/js-sdk/issues/1228)) ([845d24c](https://github.com/open-feature/js-sdk/commit/845d24c5fecc80de3080e49fde839f08ecac6b33))
+
+## [1.6.0](https://github.com/open-feature/js-sdk/compare/web-sdk-v1.5.0...web-sdk-v1.6.0) (2025-08-12)
+
+
+### ✨ New Features
+
+* add evaluation-scoped hook data ([#1216](https://github.com/open-feature/js-sdk/issues/1216)) ([07af3a9](https://github.com/open-feature/js-sdk/commit/07af3a9eda895e9edb24c7ee1e3c1c4f16e17431))
+* **web-global-build:** impl ([#1225](https://github.com/open-feature/js-sdk/issues/1225)) ([40a512e](https://github.com/open-feature/js-sdk/commit/40a512e21204eb92dc3ef4161b383f9c1fd74da7))
+
+
+### 📚 Documentation
+
+* Clarify the behavior of setProviderAndWait ([#1180](https://github.com/open-feature/js-sdk/issues/1180)) ([4fe8d87](https://github.com/open-feature/js-sdk/commit/4fe8d87a2e5df2cbd4086cc4f4a380e8857ed8ba))
+
+## [1.5.0](https://github.com/open-feature/js-sdk/compare/web-sdk-v1.4.1...web-sdk-v1.5.0) (2025-04-11)
+
+
+### ✨ New Features
+
+* add a top-level method for accessing providers ([#1152](https://github.com/open-feature/js-sdk/issues/1152)) ([ae8fce8](https://github.com/open-feature/js-sdk/commit/ae8fce87530005ed20f7e68dc696ce67053fca31))
+* add support for abort controllers to event handlers ([#1151](https://github.com/open-feature/js-sdk/issues/1151)) ([6a22483](https://github.com/open-feature/js-sdk/commit/6a224830fa4e62fc30a7802536f6f6fc3f772038))
+
+
+### 🐛 Bug Fixes
+
+* Typo in name of the function ([2c5b37c](https://github.com/open-feature/js-sdk/commit/2c5b37c79d72d60864c27b9e67d96e99ef4ae241))
+
+## [1.4.1](https://github.com/open-feature/js-sdk/compare/web-sdk-v1.4.0...web-sdk-v1.4.1) (2025-02-07)
+
+
+### 🐛 Bug Fixes
+
+* msg missing when providers return err resolutions ([#1134](https://github.com/open-feature/js-sdk/issues/1134)) ([bc9f6e4](https://github.com/open-feature/js-sdk/commit/bc9f6e44da3f1c0a66659aee2d0316629ac34fbf))
+
+
+### 🧹 Chore
+
+* update core peer ([8bbd43e](https://github.com/open-feature/js-sdk/commit/8bbd43e579a0c2e0c5b7eec00f94bbcffce04773))
+
 ## [1.4.0](https://github.com/open-feature/js-sdk/compare/web-sdk-v1.3.2...web-sdk-v1.4.0) (2024-12-18)
 
 ### ⚠ BREAKING CHANGES

packages/web/README.md

@@ -16,8 +16,8 @@
     <img alt="Specification" src="https://img.shields.io/static/v1?label=specification&message=v0.8.0&color=yellow&style=for-the-badge" />
   </a>
   <!-- x-release-please-start-version -->
-  <a href="https://github.com/open-feature/js-sdk/releases/tag/web-sdk-v1.4.0">
+  <a href="https://github.com/open-feature/js-sdk/releases/tag/web-sdk-v1.6.1">
-    <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v1.4.0&color=blue&style=for-the-badge" />
+    <img alt="Release" src="https://img.shields.io/static/v1?label=release&message=v1.6.1&color=blue&style=for-the-badge" />
   </a>
   <!-- x-release-please-end -->
   <br/>
@@ -75,7 +75,11 @@ yarn add @openfeature/web-sdk @openfeature/core
 import { OpenFeature } from '@openfeature/web-sdk';
 
 // Register your feature flag provider
-await OpenFeature.setProviderAndWait(new YourProviderOfChoice());
+try {
+  await OpenFeature.setProviderAndWait(new YourProviderOfChoice());
+} catch (error) {
+  console.error('Failed to initialize provider:', error);
+}
 
 // create a new client
 const client = OpenFeature.getClient();
@@ -121,7 +125,11 @@ Once you've added a provider as a dependency, it can be registered with OpenFeat
 To register a provider and ensure it is ready before further actions are taken, you can use the `setProviderAndWait` method as shown below:
 
 ```ts
-await OpenFeature.setProviderAndWait(new MyProvider());
+try {
+  await OpenFeature.setProviderAndWait(new MyProvider());
+} catch (error) {
+  console.error('Failed to initialize provider:', error);
+}
 ```
 
 #### Synchronous
@@ -172,7 +180,7 @@ await OpenFeature.setContext({ targetingKey: localStorage.getItem("targetingKey"
 ```
 
 Context is global and setting it is `async`.
-Providers may implement an `onContextChanged` method that receives the old and newer contexts.
+Providers may implement an `onContextChange` method that receives the old and newer contexts.
 Given a context change, providers can use this method internally to detect if the flag values cached on the client are still valid.
 If needed, a request will be made to the provider with the new context in order to get the correct flag values.
 

packages/web/package.json

@@ -1,8 +1,10 @@
 {
   "name": "@openfeature/web-sdk",
-  "version": "1.4.0",
+  "version": "1.6.1",
   "description": "OpenFeature SDK for Web",
   "main": "./dist/cjs/index.js",
+  "unpkg": "dist/global/index.min.js",
+  "jsdelivr": "dist/global/index.min.js",
   "files": [
     "dist/"
   ],
@@ -20,8 +22,10 @@
     "clean": "shx rm -rf ./dist",
     "build:web-esm": "esbuild src/index.ts --bundle --external:@openfeature/core --sourcemap --target=es2015 --platform=browser --format=esm --outfile=./dist/esm/index.js --analyze",
     "build:web-cjs": "esbuild src/index.ts --bundle --external:@openfeature/core --sourcemap --target=es2015 --platform=browser --format=cjs --outfile=./dist/cjs/index.js --analyze",
+    "build:web-global": "esbuild src/index.ts --bundle --sourcemap --target=es2015 --platform=browser --format=iife --outfile=./dist/global/index.js --global-name=OpenFeature --analyze",
+    "build:web-global:min": "esbuild src/index.ts --bundle --sourcemap --target=es2015 --platform=browser --format=iife --outfile=./dist/global/index.min.js --global-name=OpenFeature --minify --analyze",
     "build:rollup-types": "rollup -c ../../rollup.config.mjs",
-    "build": "npm run clean && npm run build:web-esm && npm run build:web-cjs && npm run build:rollup-types",
+    "build": "npm run clean && npm run build:web-esm && npm run build:web-cjs && npm run build:web-global && npm run build:web-global:min && npm run build:rollup-types",
     "postbuild": "shx cp ./../../package.esm.json ./dist/esm/package.json",
     "current-version": "echo $npm_package_version",
     "prepack": "shx cp ./../../LICENSE ./LICENSE",
@@ -46,9 +50,9 @@
   },
   "homepage": "https://github.com/open-feature/js-sdk#readme",
   "peerDependencies": {
-    "@openfeature/core": "^1.7.0"
+    "@openfeature/core": "^1.9.0"
   },
   "devDependencies": {
-    "@openfeature/core": "^1.7.0"
+    "@openfeature/core": "^1.9.0"
   }
 }

packages/web/src/client/internal/open-feature-client.ts

@@ -12,6 +12,7 @@ import type {
   OpenFeatureError,
   FlagMetadata,
   ResolutionDetails,
+  EventOptions,
 } from '@openfeature/core';
 import {
   ErrorCode,
@@ -21,6 +22,7 @@ import {
   StandardResolutionReasons,
   instantiateErrorByErrorCode,
   statusMatchesEvent,
+  MapHookData,
 } from '@openfeature/core';
 import type { FlagEvaluationOptions } from '../../evaluation';
 import type { ProviderEvents } from '../../events';
@@ -74,7 +76,7 @@ export class OpenFeatureClient implements Client {
     return this.providerStatusAccessor();
   }
 
-  addHandler(eventType: ProviderEvents, handler: EventHandler): void {
+  addHandler(eventType: ProviderEvents, handler: EventHandler, options: EventOptions): void {
     this.emitterAccessor().addHandler(eventType, handler);
     const shouldRunNow = statusMatchesEvent(eventType, this.providerStatus);
 
@@ -90,6 +92,12 @@ export class OpenFeatureClient implements Client {
         this._logger?.error('Error running event handler:', err);
       }
     }
+
+    if (options?.signal && typeof options.signal.addEventListener === 'function') {
+      options.signal.addEventListener('abort', () => {
+        this.removeHandler(eventType, handler);
+      });
+    }
   }
 
   removeHandler(notificationType: ProviderEvents, handler: EventHandler): void {
@@ -224,22 +232,26 @@ export class OpenFeatureClient implements Client {
       ...this.apiContextAccessor(this?.options?.domain),
     };
 
-    // this reference cannot change during the course of evaluation
+    // Create hook context instances for each hook (stable object references for the entire evaluation)
-    // it may be used as a key in WeakMaps
+    // This ensures hooks can use WeakMaps with hookContext as keys across lifecycle methods
-    const hookContext: Readonly<HookContext> = {
+    // NOTE: Uses the reversed order to reduce the number of times we have to calculate the index.
-      flagKey,
+    const hookContexts = allHooksReversed.map<HookContext>(() =>
-      defaultValue,
+      Object.freeze({
-      flagValueType: flagType,
+        flagKey,
-      clientMetadata: this.metadata,
+        defaultValue,
-      providerMetadata: this._provider.metadata,
+        flagValueType: flagType,
-      context,
+        clientMetadata: this.metadata,
-      logger: this._logger,
+        providerMetadata: this._provider.metadata,
-    };
+        context,
+        logger: this._logger,
+        hookData: new MapHookData(),
+      }),
+    );
 
     let evaluationDetails: EvaluationDetails<T>;
 
     try {
-      this.beforeHooks(allHooks, hookContext, options);
+      this.beforeHooks(allHooks, hookContexts, options);
 
       this.shortCircuitIfNotReady();
 
@@ -254,45 +266,48 @@ export class OpenFeatureClient implements Client {
 
       if (resolutionDetails.errorCode) {
         const err = instantiateErrorByErrorCode(resolutionDetails.errorCode, resolutionDetails.errorMessage);
-        this.errorHooks(allHooksReversed, hookContext, err, options);
+        this.errorHooks(allHooksReversed, hookContexts, err, options);
         evaluationDetails = this.getErrorEvaluationDetails(flagKey, defaultValue, err, resolutionDetails.flagMetadata);
       } else {
-        this.afterHooks(allHooksReversed, hookContext, resolutionDetails, options);
+        this.afterHooks(allHooksReversed, hookContexts, resolutionDetails, options);
         evaluationDetails = resolutionDetails;
       }
     } catch (err: unknown) {
-      this.errorHooks(allHooksReversed, hookContext, err, options);
+      this.errorHooks(allHooksReversed, hookContexts, err, options);
       evaluationDetails = this.getErrorEvaluationDetails(flagKey, defaultValue, err);
     }
-    this.finallyHooks(allHooksReversed, hookContext, evaluationDetails, options);
+    this.finallyHooks(allHooksReversed, hookContexts, evaluationDetails, options);
     return evaluationDetails;
   }
 
-  private beforeHooks(hooks: Hook[], hookContext: HookContext, options: FlagEvaluationOptions) {
+  private beforeHooks(hooks: Hook[], hookContexts: HookContext[], options: FlagEvaluationOptions) {
-    Object.freeze(hookContext);
+    for (const [index, hook] of hooks.entries()) {
-    Object.freeze(hookContext.context);
+      const hookContextIndex = hooks.length - 1 - index; // reverse index for before hooks
-
+      const hookContext = hookContexts[hookContextIndex];
-    for (const hook of hooks) {
+      Object.freeze(hookContext);
+      Object.freeze(hookContext.context);
       hook?.before?.(hookContext, Object.freeze(options.hookHints));
     }
   }
 
   private afterHooks(
     hooks: Hook[],
-    hookContext: HookContext,
+    hookContexts: HookContext[],
     evaluationDetails: EvaluationDetails<FlagValue>,
     options: FlagEvaluationOptions,
   ) {
     // run "after" hooks sequentially
-    for (const hook of hooks) {
+    for (const [index, hook] of hooks.entries()) {
+      const hookContext = hookContexts[index];
       hook?.after?.(hookContext, evaluationDetails, options.hookHints);
     }
   }
 
-  private errorHooks(hooks: Hook[], hookContext: HookContext, err: unknown, options: FlagEvaluationOptions) {
+  private errorHooks(hooks: Hook[], hookContexts: HookContext[], err: unknown, options: FlagEvaluationOptions) {
     // run "error" hooks sequentially
-    for (const hook of hooks) {
+    for (const [index, hook] of hooks.entries()) {
       try {
+        const hookContext = hookContexts[index];
         hook?.error?.(hookContext, err, options.hookHints);
       } catch (err) {
         this._logger.error(`Unhandled error during 'error' hook: ${err}`);
@@ -306,13 +321,14 @@ export class OpenFeatureClient implements Client {
 
   private finallyHooks(
     hooks: Hook[],
-    hookContext: HookContext,
+    hookContexts: HookContext[],
     evaluationDetails: EvaluationDetails<FlagValue>,
     options: FlagEvaluationOptions,
   ) {
     // run "finally" hooks sequentially
-    for (const hook of hooks) {
+    for (const [index, hook] of hooks.entries()) {
       try {
+        const hookContext = hookContexts[index];
         hook?.finally?.(hookContext, evaluationDetails, options.hookHints);
       } catch (err) {
         this._logger.error(`Unhandled error during 'finally' hook: ${err}`);

packages/web/src/hooks/hook.ts

@@ -1,3 +1,3 @@
 import type { BaseHook, FlagValue } from '@openfeature/core';
 
-export type Hook = BaseHook<FlagValue, void, void>;
+export type Hook<TData = Record<string, unknown>> = BaseHook<FlagValue, TData, void, void>;

packages/web/src/open-feature.ts

@@ -77,7 +77,7 @@ export class OpenFeatureAPI
    * Setting a provider supersedes the current provider used in new and existing unbound clients.
    * @param {Provider} provider The provider responsible for flag evaluations.
    * @returns {Promise<void>}
-   * @throws Uncaught exceptions thrown by the provider during initialization.
+   * @throws {Error} If the provider throws an exception during initialization.
    */
   setProviderAndWait(provider: Provider): Promise<void>;
   /**
@@ -87,7 +87,7 @@ export class OpenFeatureAPI
    * @param {Provider} provider The provider responsible for flag evaluations.
    * @param {EvaluationContext} context The evaluation context to use for flag evaluations.
    * @returns {Promise<void>}
-   * @throws Uncaught exceptions thrown by the provider during initialization.
+   * @throws {Error} If the provider throws an exception during initialization.
    */
   setProviderAndWait(provider: Provider, context: EvaluationContext): Promise<void>;
   /**
@@ -97,7 +97,7 @@ export class OpenFeatureAPI
    * @param {string} domain The name to identify the client
    * @param {Provider} provider The provider responsible for flag evaluations.
    * @returns {Promise<void>}
-   * @throws Uncaught exceptions thrown by the provider during initialization.
+   * @throws {Error} If the provider throws an exception during initialization.
    */
   setProviderAndWait(domain: string, provider: Provider): Promise<void>;
   /**
@@ -108,7 +108,7 @@ export class OpenFeatureAPI
    * @param {Provider} provider The provider responsible for flag evaluations.
    * @param {EvaluationContext} context The evaluation context to use for flag evaluations.
    * @returns {Promise<void>}
-   * @throws Uncaught exceptions thrown by the provider during initialization.
+   * @throws {Error} If the provider throws an exception during initialization.
    */
   setProviderAndWait(domain: string, provider: Provider, context: EvaluationContext): Promise<void>;
   async setProviderAndWait(
@@ -205,6 +205,27 @@ export class OpenFeatureAPI
     return this;
   }
 
+  /**
+   * Get the default provider.
+   *
+   * Note that it isn't recommended to interact with the provider directly, but rather through
+   * an OpenFeature client.
+   * @returns {Provider} Default Provider
+   */
+  getProvider(): Provider;
+  /**
+   * Get the provider bound to the specified domain.
+   *
+   * Note that it isn't recommended to interact with the provider directly, but rather through
+   * an OpenFeature client.
+   * @param {string} domain An identifier which logically binds clients with providers
+   * @returns {Provider} Domain-scoped provider
+   */
+  getProvider(domain?: string): Provider;
+  getProvider(domain?: string): Provider {
+    return this.getProviderForClient(domain);
+  }
+
   /**
    * Sets the evaluation context globally.
    * This will be used by all providers that have not bound to a domain.
@@ -325,9 +346,9 @@ export class OpenFeatureAPI
   }
 
   /**
-   * A factory function for creating new named OpenFeature clients. Clients can contain
+   * A factory function for creating new domain-scoped OpenFeature clients. Clients
-   * their own state (e.g. logger, hook, context). Multiple clients can be used
+   * can contain their own state (e.g. logger, hook, context). Multiple domains
-   * to segment feature flag configuration.
+   * can be used to segment feature flag configuration.
    *
    * If there is already a provider bound to this name via {@link this.setProvider setProvider}, this provider will be used.
    * Otherwise, the default provider is used until a provider is assigned to that name.

packages/web/test/events.spec.ts

@@ -476,7 +476,21 @@ describe('Events', () => {
       expect(OpenFeature.getHandlers(eventType)).toHaveLength(0);
     });
 
-    it('The API provides a function allowing the removal of event handlers', () => {
+    it('The event handler can be removed using an abort signal', () => {
+      const abortController = new AbortController();
+      const handler1 = jest.fn();
+      const handler2 = jest.fn();
+      const eventType = ProviderEvents.Stale;
+
+      OpenFeature.addHandler(eventType, handler1, { signal: abortController.signal });
+      OpenFeature.addHandler(eventType, handler2);
+      expect(OpenFeature.getHandlers(eventType)).toHaveLength(2);
+
+      abortController.abort();
+      expect(OpenFeature.getHandlers(eventType)).toHaveLength(1);
+    });
+
+    it('The API provides a function allowing the removal of event handlers from client', () => {
       const client = OpenFeature.getClient(domain);
       const handler = jest.fn();
       const eventType = ProviderEvents.Stale;
@@ -486,6 +500,21 @@ describe('Events', () => {
       client.removeHandler(eventType, handler);
       expect(client.getHandlers(eventType)).toHaveLength(0);
     });
+
+    it('The event handler on the client can be removed using an abort signal', () => {
+      const abortController = new AbortController();
+      const client = OpenFeature.getClient(domain);
+      const handler1 = jest.fn();
+      const handler2 = jest.fn();
+      const eventType = ProviderEvents.Stale;
+
+      client.addHandler(eventType, handler1, { signal: abortController.signal });
+      client.addHandler(eventType, handler2);
+      expect(client.getHandlers(eventType)).toHaveLength(2);
+
+      abortController.abort();
+      expect(client.getHandlers(eventType)).toHaveLength(1);
+    });
   });
 
   describe('Requirement 5.3.1', () => {

packages/web/test/hooks-data.spec.ts

@@ -0,0 +1,436 @@
+import { OpenFeatureAPI } from '../src/open-feature';
+import type { Client } from '../src/client';
+import type { JsonValue, ResolutionDetails, HookContext, BeforeHookContext } from '@openfeature/core';
+import { StandardResolutionReasons } from '@openfeature/core';
+import type { Provider } from '../src/provider';
+import type { Hook } from '../src/hooks';
+
+const BOOLEAN_VALUE = true;
+const STRING_VALUE = 'val';
+const NUMBER_VALUE = 1;
+const OBJECT_VALUE = { key: 'value' };
+
+// A test hook that stores data in the before stage and retrieves it in after/error/finally
+class TestHookWithData implements Hook {
+  beforeData: unknown;
+  afterData: unknown;
+  errorData: unknown;
+  finallyData: unknown;
+
+  before(hookContext: BeforeHookContext) {
+    // Store some data
+    hookContext.hookData.set('testKey', 'testValue');
+    hookContext.hookData.set('timestamp', Date.now());
+    hookContext.hookData.set('object', { nested: 'value' });
+    this.beforeData = hookContext.hookData.get('testKey');
+  }
+
+  after(hookContext: HookContext) {
+    // Retrieve data stored in before
+    this.afterData = hookContext.hookData.get('testKey');
+  }
+
+  error(hookContext: HookContext) {
+    // Retrieve data stored in before
+    this.errorData = hookContext.hookData.get('testKey');
+  }
+
+  finally(hookContext: HookContext) {
+    // Retrieve data stored in before
+    this.finallyData = hookContext.hookData.get('testKey');
+  }
+}
+
+// A timing hook that measures evaluation duration
+class TimingHook implements Hook {
+  duration?: number;
+
+  before(hookContext: BeforeHookContext) {
+    hookContext.hookData.set('startTime', performance.now());
+  }
+
+  after(hookContext: HookContext) {
+    const startTime = hookContext.hookData.get('startTime') as number;
+    if (startTime) {
+      this.duration = performance.now() - startTime;
+    }
+  }
+
+  error(hookContext: HookContext) {
+    const startTime = hookContext.hookData.get('startTime') as number;
+    if (startTime) {
+      this.duration = performance.now() - startTime;
+    }
+  }
+}
+
+// Hook that tests hook data isolation
+class IsolationTestHook implements Hook {
+  hookId: string;
+
+  constructor(id: string) {
+    this.hookId = id;
+  }
+
+  before(hookContext: BeforeHookContext) {
+    const storedId = hookContext.hookData.get('hookId');
+    if (storedId) {
+      throw new Error('Hook data isolation violated! Data is set in before hook.');
+    }
+
+    // Each hook instance should have its own data
+    hookContext.hookData.set('hookId', this.hookId);
+    hookContext.hookData.set(`data_${this.hookId}`, `value_${this.hookId}`);
+  }
+
+  after(hookContext: HookContext) {
+    // Verify we can only see our own data
+    const storedId = hookContext.hookData.get('hookId');
+    if (storedId !== this.hookId) {
+      throw new Error(`Hook data isolation violated! Expected ${this.hookId}, got ${storedId}`);
+    }
+  }
+}
+
+// Mock provider for testing
+const MOCK_PROVIDER: Provider = {
+  metadata: { name: 'mock-provider' },
+  resolveBooleanEvaluation(): ResolutionDetails<boolean> {
+    return {
+      value: BOOLEAN_VALUE,
+      variant: 'default',
+      reason: StandardResolutionReasons.DEFAULT,
+    };
+  },
+  resolveStringEvaluation(): ResolutionDetails<string> {
+    return {
+      value: STRING_VALUE,
+      variant: 'default',
+      reason: StandardResolutionReasons.DEFAULT,
+    };
+  },
+  resolveNumberEvaluation(): ResolutionDetails<number> {
+    return {
+      value: NUMBER_VALUE,
+      variant: 'default',
+      reason: StandardResolutionReasons.DEFAULT,
+    };
+  },
+  resolveObjectEvaluation<T extends JsonValue>(): ResolutionDetails<T> {
+    return {
+      value: OBJECT_VALUE as unknown as T,
+      variant: 'default',
+      reason: StandardResolutionReasons.DEFAULT,
+    };
+  },
+} as Provider;
+
+// Mock provider that throws an error
+const ERROR_PROVIDER: Provider = {
+  metadata: { name: 'error-provider' },
+  resolveBooleanEvaluation(): ResolutionDetails<boolean> {
+    throw new Error('Provider error');
+  },
+  resolveStringEvaluation(): ResolutionDetails<string> {
+    throw new Error('Provider error');
+  },
+  resolveNumberEvaluation(): ResolutionDetails<number> {
+    throw new Error('Provider error');
+  },
+  resolveObjectEvaluation<T extends JsonValue>(): ResolutionDetails<T> {
+    throw new Error('Provider error');
+  },
+};
+
+describe('Hook Data (Web SDK)', () => {
+  let client: Client;
+  let api: OpenFeatureAPI;
+
+  beforeEach(() => {
+    api = OpenFeatureAPI.getInstance();
+    api.clearHooks();
+    api.setProvider(MOCK_PROVIDER);
+    client = api.getClient();
+  });
+
+  afterEach(() => {
+    api.clearProviders();
+  });
+
+  describe('Basic Hook Data Functionality', () => {
+    it('should allow hooks to store and retrieve data across stages', () => {
+      const hook = new TestHookWithData();
+      client.addHooks(hook);
+
+      client.getBooleanValue('test-flag', false);
+
+      // Verify data was stored in before and retrieved in all other stages
+      expect(hook.beforeData).toBe('testValue');
+      expect(hook.afterData).toBe('testValue');
+      expect(hook.finallyData).toBe('testValue');
+    });
+
+    it('should support storing different data types', () => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const storedValues: any = {};
+
+      const hook: Hook = {
+        before(hookContext: BeforeHookContext) {
+          // Store various types
+          hookContext.hookData.set('string', 'test');
+          hookContext.hookData.set('number', 42);
+          hookContext.hookData.set('boolean', true);
+          hookContext.hookData.set('object', { key: 'value' });
+          hookContext.hookData.set('array', [1, 2, 3]);
+          hookContext.hookData.set('null', null);
+          hookContext.hookData.set('undefined', undefined);
+        },
+
+        after(hookContext: HookContext) {
+          storedValues.string = hookContext.hookData.get('string');
+          storedValues.number = hookContext.hookData.get('number');
+          storedValues.boolean = hookContext.hookData.get('boolean');
+          storedValues.object = hookContext.hookData.get('object');
+          storedValues.array = hookContext.hookData.get('array');
+          storedValues.null = hookContext.hookData.get('null');
+          storedValues.undefined = hookContext.hookData.get('undefined');
+        },
+      };
+
+      client.addHooks(hook);
+      client.getBooleanValue('test-flag', false);
+
+      expect(storedValues.string).toBe('test');
+      expect(storedValues.number).toBe(42);
+      expect(storedValues.boolean).toBe(true);
+      expect(storedValues.object).toEqual({ key: 'value' });
+      expect(storedValues.array).toEqual([1, 2, 3]);
+      expect(storedValues.null).toBeNull();
+      expect(storedValues.undefined).toBeUndefined();
+    });
+
+    it('should handle hook data in error scenarios', () => {
+      api.setProvider(ERROR_PROVIDER);
+      const hook = new TestHookWithData();
+      client.addHooks(hook);
+
+      client.getBooleanValue('test-flag', false);
+
+      // Verify data was accessible in error and finally stages
+      expect(hook.beforeData).toBe('testValue');
+      expect(hook.errorData).toBe('testValue');
+      expect(hook.finallyData).toBe('testValue');
+      expect(hook.afterData).toBeUndefined(); // after should not run on error
+    });
+  });
+
+  describe('Hook Data API', () => {
+    it('should support has() method', () => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const hasResults: any = {};
+
+      const hook: Hook = {
+        before(hookContext: BeforeHookContext) {
+          hookContext.hookData.set('exists', 'value');
+          hasResults.beforeExists = hookContext.hookData.has('exists');
+          hasResults.beforeNotExists = hookContext.hookData.has('notExists');
+        },
+
+        after(hookContext: HookContext) {
+          hasResults.afterExists = hookContext.hookData.has('exists');
+          hasResults.afterNotExists = hookContext.hookData.has('notExists');
+        },
+      };
+
+      client.addHooks(hook);
+      client.getBooleanValue('test-flag', false);
+
+      expect(hasResults.beforeExists).toBe(true);
+      expect(hasResults.beforeNotExists).toBe(false);
+      expect(hasResults.afterExists).toBe(true);
+      expect(hasResults.afterNotExists).toBe(false);
+    });
+
+    it('should support delete() method', () => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const deleteResults: any = {};
+
+      const hook: Hook = {
+        before(hookContext: BeforeHookContext) {
+          hookContext.hookData.set('toDelete', 'value');
+          deleteResults.hasBeforeDelete = hookContext.hookData.has('toDelete');
+          deleteResults.deleteResult = hookContext.hookData.delete('toDelete');
+          deleteResults.hasAfterDelete = hookContext.hookData.has('toDelete');
+          deleteResults.deleteAgainResult = hookContext.hookData.delete('toDelete');
+        },
+      };
+
+      client.addHooks(hook);
+      client.getBooleanValue('test-flag', false);
+
+      expect(deleteResults.hasBeforeDelete).toBe(true);
+      expect(deleteResults.deleteResult).toBe(true);
+      expect(deleteResults.hasAfterDelete).toBe(false);
+      expect(deleteResults.deleteAgainResult).toBe(false);
+    });
+
+    it('should support clear() method', () => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const clearResults: any = {};
+
+      const hook: Hook = {
+        before(hookContext: BeforeHookContext) {
+          hookContext.hookData.set('key1', 'value1');
+          hookContext.hookData.set('key2', 'value2');
+          hookContext.hookData.set('key3', 'value3');
+          clearResults.hasBeforeClear = hookContext.hookData.has('key1');
+          hookContext.hookData.clear();
+          clearResults.hasAfterClear = hookContext.hookData.has('key1');
+        },
+
+        after(hookContext: HookContext) {
+          // Verify all data was cleared
+          clearResults.afterHasKey1 = hookContext.hookData.has('key1');
+          clearResults.afterHasKey2 = hookContext.hookData.has('key2');
+          clearResults.afterHasKey3 = hookContext.hookData.has('key3');
+        },
+      };
+
+      client.addHooks(hook);
+      client.getBooleanValue('test-flag', false);
+
+      expect(clearResults.hasBeforeClear).toBe(true);
+      expect(clearResults.hasAfterClear).toBe(false);
+      expect(clearResults.afterHasKey1).toBe(false);
+      expect(clearResults.afterHasKey2).toBe(false);
+      expect(clearResults.afterHasKey3).toBe(false);
+    });
+  });
+
+  describe('Hook Data Isolation', () => {
+    it('should isolate data between different hook instances', () => {
+      const hook1 = new IsolationTestHook('hook1');
+      const hook2 = new IsolationTestHook('hook2');
+      const hook3 = new IsolationTestHook('hook3');
+
+      client.addHooks(hook1, hook2, hook3);
+
+      expect(client.getBooleanValue('test-flag', false)).toBe(true);
+    });
+
+    it('should isolate data between the same hook instance', () => {
+      const hook = new IsolationTestHook('hook');
+
+      client.addHooks(hook, hook);
+
+      expect(client.getBooleanValue('test-flag', false)).toBe(true);
+    });
+
+    it('should not share data between different evaluations', () => {
+      let firstEvalData: unknown;
+      let secondEvalData: unknown;
+
+      const hook: Hook = {
+        before(hookContext: BeforeHookContext) {
+          // Check if data exists from previous evaluation
+          const existingData = hookContext.hookData.get('evalData');
+          if (existingData) {
+            throw new Error('Hook data leaked between evaluations!');
+          }
+          hookContext.hookData.set('evalData', 'evaluation-specific');
+        },
+
+        after(hookContext: HookContext) {
+          if (!firstEvalData) {
+            firstEvalData = hookContext.hookData.get('evalData');
+          } else {
+            secondEvalData = hookContext.hookData.get('evalData');
+          }
+        },
+      };
+
+      client.addHooks(hook);
+
+      // First evaluation
+      client.getBooleanValue('test-flag', false);
+      // Second evaluation
+      client.getBooleanValue('test-flag', false);
+
+      expect(firstEvalData).toBe('evaluation-specific');
+      expect(secondEvalData).toBe('evaluation-specific');
+    });
+
+    it('should isolate data between global, client, and invocation hooks', () => {
+      const globalHook = new IsolationTestHook('global');
+      const clientHook = new IsolationTestHook('client');
+      const invocationHook = new IsolationTestHook('invocation');
+
+      api.addHooks(globalHook);
+      client.addHooks(clientHook);
+
+      expect(client.getBooleanValue('test-flag', false, { hooks: [invocationHook] })).toBe(true);
+    });
+  });
+
+  describe('Use Cases', () => {
+    it('should support timing measurements', () => {
+      const timingHook = new TimingHook();
+      client.addHooks(timingHook);
+
+      client.getBooleanValue('test-flag', false);
+
+      expect(timingHook.duration).toBeDefined();
+      expect(timingHook.duration).toBeGreaterThanOrEqual(0);
+    });
+
+    it('should support multi-stage validation accumulation', () => {
+      let finalErrors: string[] = [];
+
+      const validationHook: Hook = {
+        before(hookContext: BeforeHookContext) {
+          hookContext.hookData.set('errors', []);
+
+          // Simulate validation
+          const errors = hookContext.hookData.get('errors') as string[];
+          if (!hookContext.context.userId) {
+            errors.push('Missing userId');
+          }
+          if (!hookContext.context.region) {
+            errors.push('Missing region');
+          }
+        },
+
+        finally(hookContext: HookContext) {
+          finalErrors = (hookContext.hookData.get('errors') as string[]) || [];
+        },
+      };
+
+      client.addHooks(validationHook);
+      client.getBooleanValue('test-flag', false, {});
+
+      expect(finalErrors).toContain('Missing userId');
+      expect(finalErrors).toContain('Missing region');
+    });
+
+    it('should support request correlation', () => {
+      let correlationId: string | undefined;
+
+      const correlationHook: Hook = {
+        before(hookContext: BeforeHookContext) {
+          const id = `req-${Date.now()}-${Math.random()}`;
+          hookContext.hookData.set('correlationId', id);
+        },
+
+        after(hookContext: HookContext) {
+          correlationId = hookContext.hookData.get('correlationId') as string;
+        },
+      };
+
+      client.addHooks(correlationHook);
+      client.getBooleanValue('test-flag', false);
+
+      expect(correlationId).toBeDefined();
+      expect(correlationId).toMatch(/^req-\d+-[\d.]+$/);
+    });
+  });
+});

packages/web/test/open-feature.spec.ts

@@ -75,8 +75,8 @@ describe('OpenFeature', () => {
     it('should set the default provider if no domain is provided', () => {
       const provider = mockProvider();
       OpenFeature.setProvider(provider);
-      const client = OpenFeature.getClient();
+      const registeredProvider = OpenFeature.getProvider();
-      expect(client.metadata.providerMetadata.name).toEqual(provider.metadata.name);
+      expect(registeredProvider).toEqual(provider);
     });
 
     it('should not change providers associated with a domain when setting a new default provider', () => {
@@ -86,11 +86,11 @@ describe('OpenFeature', () => {
       OpenFeature.setProvider(provider);
       OpenFeature.setProvider(domain, fakeProvider);
 
-      const defaultClient = OpenFeature.getClient();
+      const defaultProvider = OpenFeature.getProvider();
-      const domainSpecificClient = OpenFeature.getClient(domain);
+      const domainSpecificProvider = OpenFeature.getProvider(domain);
 
-      expect(defaultClient.metadata.providerMetadata.name).toEqual(provider.metadata.name);
+      expect(defaultProvider).toEqual(provider);
-      expect(domainSpecificClient.metadata.providerMetadata.name).toEqual(fakeProvider.metadata.name);
+      expect(domainSpecificProvider).toEqual(fakeProvider);
     });
 
     it('should bind a new provider to existing clients in a matching domain', () => {

release-please-config.json

@@ -29,7 +29,7 @@
     },
     "packages/angular/projects/angular-sdk": {
       "release-type": "node",
-      "prerelease": true,
+      "prerelease": false,
       "bump-minor-pre-major": true,
       "bump-patch-for-minor-pre-major": true,
       "extra-files": ["README.md"],