refactor(grpc-js): convert from gts to eslint/prettier/tsconfig

GTS provides config for ESLint, Prettier and TSConfig; this commit removes GTS, but brings over the configuration details

Fixes #2464

packages/grpc-js/.eslintrc

@@ -1,11 +1,61 @@
 {
   "root": true,
-  "extends": "./node_modules/gts",
+
+  "extends": [
+    "eslint:recommended",
+    "plugin:node/recommended",
+    "plugin:@typescript-eslint/recommended",
+    "plugin:prettier/recommended"
+  ],
+  "plugins": ["node", "prettier", "@typescript-eslint"],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  },
+  "ignorePatterns": ["**/generated/**", "**/node_modules/**", "**/build/**"],
   "rules": {
-    "node/no-unpublished-import": ["error", {
+    "node/no-unpublished-import": [
+      "error",
+      {
         "tryExtensions": [".ts", ".js", ".json", ".node"]
-    }],
+      }
+    ],
     "@typescript-eslint/no-unused-vars": "off",
-    "node/no-unpublished-require": "off"
+    "node/no-unpublished-require": "off",
+    "prettier/prettier": "error",
+    "block-scoped-var": "error",
+    "eqeqeq": "error",
+    "no-var": "error",
+    "prefer-const": "error",
+    "no-case-declarations": "warn",
+    "no-restricted-properties": [
+      "error",
+      {
+        "object": "describe",
+        "property": "only"
+      },
+      {
+        "object": "it",
+        "property": "only"
+      }
+    ],
+
+    "@typescript-eslint/no-non-null-assertion": "off",
+    "@typescript-eslint/no-use-before-define": "off",
+    "@typescript-eslint/no-warning-comments": "off",
+    "@typescript-eslint/no-empty-function": "off",
+    "@typescript-eslint/no-var-requires": "off",
+    "@typescript-eslint/explicit-function-return-type": "off",
+    "@typescript-eslint/explicit-module-boundary-types": "off",
+    "@typescript-eslint/ban-types": "off",
+    "@typescript-eslint/camelcase": "off",
+    "node/no-missing-import": "off",
+    "node/no-empty-function": "off",
+    "node/no-unsupported-features/es-syntax": "off",
+    "node/no-missing-require": "off",
+    "node/shebang": "off",
+    "no-dupe-class-members": "off",
+    "require-atomic-updates": "off"
   }
 }

packages/grpc-js/package.json

@@ -22,9 +22,15 @@
     "@types/ncp": "^2.0.1",
     "@types/pify": "^3.0.2",
     "@types/semver": "^7.3.9",
+    "@typescript-eslint/eslint-plugin": "^5.59.11",
+    "@typescript-eslint/parser": "^5.59.11",
+    "@typescript-eslint/typescript-estree": "^5.59.11",
     "clang-format": "^1.0.55",
+    "eslint": "^8.42.0",
+    "eslint-config-prettier": "^8.8.0",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-prettier": "^4.2.1",
     "execa": "^2.0.3",
-    "gts": "^3.1.1",
     "gulp": "^4.0.2",
     "gulp-mocha": "^6.0.0",
     "lodash": "^4.17.4",
@@ -32,10 +38,11 @@
     "mocha-jenkins-reporter": "^0.4.1",
     "ncp": "^2.0.0",
     "pify": "^4.0.1",
+    "prettier": "^2.8.8",
     "rimraf": "^3.0.2",
     "semver": "^7.3.5",
-    "ts-node": "^8.3.0",
-    "typescript": "^4.8.4"
+    "ts-node": "^10.9.1",
+    "typescript": "^5.1.3"
   },
   "contributors": [
     {
@@ -47,11 +54,11 @@
     "clean": "rimraf ./build",
     "compile": "tsc -p .",
     "format": "clang-format -i -style=\"{Language: JavaScript, BasedOnStyle: Google, ColumnLimit: 80}\" src/*.ts test/*.ts",
-    "lint": "npm run check",
+    "lint": "eslint src/*.ts test/*.ts",
     "prepare": "npm run generate-types && npm run compile",
     "test": "gulp test",
-    "check": "gts check src/**/*.ts",
-    "fix": "gts fix src/*.ts",
+    "check": "npm run lint",
+    "fix": "eslint --fix src/*.ts test/*.ts",
     "pretest": "npm run generate-types && npm run generate-test-types && npm run compile",
     "posttest": "npm run check && madge -c ./build/src",
     "generate-types": "proto-loader-gen-types --keepCase --longs String --enums String --defaults --oneofs --includeComments --includeDirs proto/ --include-dirs test/fixtures/ -O src/generated/ --grpcLib ../index channelz.proto",

packages/grpc-js/prettier.config.js

@@ -2,4 +2,6 @@ module.exports = {
   proseWrap: 'always',
   singleQuote: true,
   trailingComma: 'es5',
+  bracketSpacing: true,
+  arrowParens: 'avoid',
 };

packages/grpc-js/tsconfig.json

@@ -1,6 +1,15 @@
 {
-  "extends": "./node_modules/gts/tsconfig-google.json",
   "compilerOptions": {
+    "allowUnreachableCode": false,
+    "allowUnusedLabels": false,
+    "declaration": true,
+    "forceConsistentCasingInFileNames": true,
+    "noEmitOnError": true,
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitReturns": true,
+    "pretty": true,
+    "sourceMap": true,
+    "strict": true,
     "lib": ["es2017"],
     "outDir": "build",
     "target": "es2017",
@@ -12,5 +21,8 @@
   "include": [
     "src/**/*.ts",
     "test/**/*.ts"
+  ],
+  "exclude": [
+    "node_modules"
   ]
 }