mirror of https://github.com/nodejs/node.git
928 lines
19 KiB
Markdown
928 lines
19 KiB
Markdown
# Global objects
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<!--introduced_in=v0.10.0-->
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<!-- type=misc -->
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These objects are available in all modules. The following variables may appear
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to be global but are not. They exist only in the scope of modules, see the
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[module system documentation][]:
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* [`__dirname`][]
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* [`__filename`][]
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* [`exports`][]
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* [`module`][]
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* [`require()`][]
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The objects listed here are specific to Node.js. There are [built-in objects][]
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that are part of the JavaScript language itself, which are also globally
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accessible.
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## Class: `AbortController`
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<!-- YAML
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added:
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- v15.0.0
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- v14.17.0
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changes:
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- version: v15.4.0
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pr-url: https://github.com/nodejs/node/pull/35949
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description: No longer experimental.
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-->
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<!-- type=global -->
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A utility class used to signal cancelation in selected `Promise`-based APIs.
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The API is based on the Web API [`AbortController`][].
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```js
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const ac = new AbortController();
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ac.signal.addEventListener('abort', () => console.log('Aborted!'),
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{ once: true });
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ac.abort();
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console.log(ac.signal.aborted); // Prints True
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```
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### `abortController.abort([reason])`
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<!-- YAML
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added:
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- v15.0.0
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- v14.17.0
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changes:
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- version:
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- v17.2.0
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- v16.14.0
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pr-url: https://github.com/nodejs/node/pull/40807
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description: Added the new optional reason argument.
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-->
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* `reason` {any} An optional reason, retrievable on the `AbortSignal`'s
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`reason` property.
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Triggers the abort signal, causing the `abortController.signal` to emit
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the `'abort'` event.
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### `abortController.signal`
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<!-- YAML
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added:
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- v15.0.0
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- v14.17.0
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-->
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* Type: {AbortSignal}
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### Class: `AbortSignal`
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<!-- YAML
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added:
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- v15.0.0
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- v14.17.0
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-->
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* Extends: {EventTarget}
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The `AbortSignal` is used to notify observers when the
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`abortController.abort()` method is called.
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#### Static method: `AbortSignal.abort([reason])`
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<!-- YAML
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added:
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- v15.12.0
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- v14.17.0
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changes:
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- version:
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- v17.2.0
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- v16.14.0
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pr-url: https://github.com/nodejs/node/pull/40807
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description: Added the new optional reason argument.
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-->
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* `reason`: {any}
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* Returns: {AbortSignal}
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Returns a new already aborted `AbortSignal`.
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#### Static method: `AbortSignal.timeout(delay)`
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<!-- YAML
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added:
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- v17.3.0
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- v16.14.0
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-->
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* `delay` {number} The number of milliseconds to wait before triggering
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the AbortSignal.
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Returns a new `AbortSignal` which will be aborted in `delay` milliseconds.
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#### Event: `'abort'`
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<!-- YAML
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added:
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- v15.0.0
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- v14.17.0
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-->
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The `'abort'` event is emitted when the `abortController.abort()` method
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is called. The callback is invoked with a single object argument with a
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single `type` property set to `'abort'`:
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```js
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const ac = new AbortController();
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// Use either the onabort property...
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ac.signal.onabort = () => console.log('aborted!');
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// Or the EventTarget API...
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ac.signal.addEventListener('abort', (event) => {
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console.log(event.type); // Prints 'abort'
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}, { once: true });
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ac.abort();
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```
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The `AbortController` with which the `AbortSignal` is associated will only
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ever trigger the `'abort'` event once. We recommended that code check
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that the `abortSignal.aborted` attribute is `false` before adding an `'abort'`
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event listener.
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Any event listeners attached to the `AbortSignal` should use the
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`{ once: true }` option (or, if using the `EventEmitter` APIs to attach a
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listener, use the `once()` method) to ensure that the event listener is
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removed as soon as the `'abort'` event is handled. Failure to do so may
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result in memory leaks.
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#### `abortSignal.aborted`
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<!-- YAML
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added:
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- v15.0.0
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- v14.17.0
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-->
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* Type: {boolean} True after the `AbortController` has been aborted.
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#### `abortSignal.onabort`
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<!-- YAML
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added:
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- v15.0.0
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- v14.17.0
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-->
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* Type: {Function}
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An optional callback function that may be set by user code to be notified
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when the `abortController.abort()` function has been called.
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#### `abortSignal.reason`
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<!-- YAML
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added:
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- v17.2.0
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- v16.14.0
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-->
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* Type: {any}
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An optional reason specified when the `AbortSignal` was triggered.
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```js
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const ac = new AbortController();
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ac.abort(new Error('boom!'));
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console.log(ac.signal.reason); // Error('boom!');
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```
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#### `abortSignal.throwIfAborted()`
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<!-- YAML
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added:
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- v17.3.0
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- v16.17.0
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-->
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If `abortSignal.aborted` is `true`, throws `abortSignal.reason`.
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## Class: `Blob`
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<!-- YAML
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added: v18.0.0
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-->
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<!-- type=global -->
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See {Blob}.
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## Class: `Buffer`
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<!-- YAML
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added: v0.1.103
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-->
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<!-- type=global -->
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* {Function}
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Used to handle binary data. See the [buffer section][].
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## Class: `ByteLengthQueuingStrategy`
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<!-- YAML
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added: v18.0.0
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-->
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> Stability: 1 - Experimental.
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A browser-compatible implementation of [`ByteLengthQueuingStrategy`][].
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## `__dirname`
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This variable may appear to be global but is not. See [`__dirname`][].
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## `__filename`
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This variable may appear to be global but is not. See [`__filename`][].
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## `atob(data)`
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<!-- YAML
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added: v16.0.0
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-->
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> Stability: 3 - Legacy. Use `Buffer.from(data, 'base64')` instead.
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Global alias for [`buffer.atob()`][].
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## `BroadcastChannel`
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<!-- YAML
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added: v18.0.0
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-->
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See {BroadcastChannel}.
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## `btoa(data)`
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<!-- YAML
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added: v16.0.0
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-->
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> Stability: 3 - Legacy. Use `buf.toString('base64')` instead.
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Global alias for [`buffer.btoa()`][].
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## `clearImmediate(immediateObject)`
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<!-- YAML
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added: v0.9.1
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-->
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<!--type=global-->
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[`clearImmediate`][] is described in the [timers][] section.
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## `clearInterval(intervalObject)`
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<!-- YAML
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added: v0.0.1
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-->
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<!--type=global-->
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[`clearInterval`][] is described in the [timers][] section.
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## `clearTimeout(timeoutObject)`
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<!-- YAML
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added: v0.0.1
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-->
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<!--type=global-->
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[`clearTimeout`][] is described in the [timers][] section.
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## Class: `CompressionStream`
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<!-- YAML
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added: v18.0.0
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-->
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> Stability: 1 - Experimental.
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A browser-compatible implementation of [`CompressionStream`][].
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## `console`
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<!-- YAML
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added: v0.1.100
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-->
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<!-- type=global -->
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* {Object}
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Used to print to stdout and stderr. See the [`console`][] section.
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## Class: `CountQueuingStrategy`
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<!-- YAML
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added: v18.0.0
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-->
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> Stability: 1 - Experimental.
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A browser-compatible implementation of [`CountQueuingStrategy`][].
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## `Crypto`
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<!-- YAML
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added:
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- v17.6.0
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- v16.15.0
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-->
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> Stability: 1 - Experimental. Enable this API with the
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> [`--experimental-global-webcrypto`][] CLI flag.
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A browser-compatible implementation of {Crypto}. This global is available
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only if the Node.js binary was compiled with including support for the
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`node:crypto` module.
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## `crypto`
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<!-- YAML
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added:
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- v17.6.0
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- v16.15.0
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-->
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> Stability: 1 - Experimental. Enable this API with the
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> [`--experimental-global-webcrypto`][] CLI flag.
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A browser-compatible implementation of the [Web Crypto API][].
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## `CryptoKey`
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<!-- YAML
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added:
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- v17.6.0
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- v16.15.0
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-->
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> Stability: 1 - Experimental. Enable this API with the
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> [`--experimental-global-webcrypto`][] CLI flag.
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A browser-compatible implementation of {CryptoKey}. This global is available
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only if the Node.js binary was compiled with including support for the
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`node:crypto` module.
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## `CustomEvent`
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<!-- YAML
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added:
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- v18.7.0
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- v16.17.0
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-->
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> Stability: 1 - Experimental. Enable this API with the
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> [`--experimental-global-customevent`][] CLI flag.
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<!-- type=global -->
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A browser-compatible implementation of the [`CustomEvent` Web API][].
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## Class: `DecompressionStream`
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<!-- YAML
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added: v18.0.0
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-->
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> Stability: 1 - Experimental.
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A browser-compatible implementation of [`DecompressionStream`][].
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## `Event`
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<!-- YAML
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added: v15.0.0
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changes:
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- version: v15.4.0
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pr-url: https://github.com/nodejs/node/pull/35949
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description: No longer experimental.
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-->
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<!-- type=global -->
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A browser-compatible implementation of the `Event` class. See
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[`EventTarget` and `Event` API][] for more details.
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## `EventTarget`
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<!-- YAML
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added: v15.0.0
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changes:
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- version: v15.4.0
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pr-url: https://github.com/nodejs/node/pull/35949
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description: No longer experimental.
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-->
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<!-- type=global -->
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A browser-compatible implementation of the `EventTarget` class. See
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[`EventTarget` and `Event` API][] for more details.
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## `exports`
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This variable may appear to be global but is not. See [`exports`][].
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## `fetch`
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<!-- YAML
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added:
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- v17.5.0
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- v16.15.0
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-->
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> Stability: 1 - Experimental. Disable this API with the [`--no-experimental-fetch`][]
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> CLI flag.
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A browser-compatible implementation of the [`fetch()`][] function.
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## Class `FormData`
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<!-- YAML
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added:
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- v17.6.0
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- v16.15.0
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-->
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> Stability: 1 - Experimental. Disable this API with the [`--no-experimental-fetch`][]
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> CLI flag.
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A browser-compatible implementation of {FormData}.
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## `global`
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<!-- YAML
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added: v0.1.27
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-->
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<!-- type=global -->
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* {Object} The global namespace object.
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In browsers, the top-level scope is the global scope. This means that
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within the browser `var something` will define a new global variable. In
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Node.js this is different. The top-level scope is not the global scope;
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`var something` inside a Node.js module will be local to that module.
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## Class `Headers`
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<!-- YAML
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added:
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- v17.5.0
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- v16.15.0
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-->
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> Stability: 1 - Experimental. Disable this API with the [`--no-experimental-fetch`][]
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> CLI flag.
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A browser-compatible implementation of {Headers}.
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## `MessageChannel`
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<!-- YAML
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added: v15.0.0
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-->
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<!-- type=global -->
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The `MessageChannel` class. See [`MessageChannel`][] for more details.
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## `MessageEvent`
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<!-- YAML
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added: v15.0.0
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-->
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<!-- type=global -->
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The `MessageEvent` class. See [`MessageEvent`][] for more details.
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## `MessagePort`
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<!-- YAML
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added: v15.0.0
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-->
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<!-- type=global -->
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The `MessagePort` class. See [`MessagePort`][] for more details.
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## `module`
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This variable may appear to be global but is not. See [`module`][].
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## `performance`
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<!-- YAML
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added: v16.0.0
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-->
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The [`perf_hooks.performance`][] object.
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## `process`
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<!-- YAML
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added: v0.1.7
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-->
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<!-- type=global -->
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* {Object}
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The process object. See the [`process` object][] section.
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## `queueMicrotask(callback)`
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<!-- YAML
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added: v11.0.0
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-->
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<!-- type=global -->
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* `callback` {Function} Function to be queued.
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The `queueMicrotask()` method queues a microtask to invoke `callback`. If
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`callback` throws an exception, the [`process` object][] `'uncaughtException'`
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event will be emitted.
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The microtask queue is managed by V8 and may be used in a similar manner to
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the [`process.nextTick()`][] queue, which is managed by Node.js. The
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`process.nextTick()` queue is always processed before the microtask queue
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within each turn of the Node.js event loop.
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```js
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// Here, `queueMicrotask()` is used to ensure the 'load' event is always
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// emitted asynchronously, and therefore consistently. Using
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// `process.nextTick()` here would result in the 'load' event always emitting
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// before any other promise jobs.
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DataHandler.prototype.load = async function load(key) {
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const hit = this._cache.get(key);
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if (hit !== undefined) {
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queueMicrotask(() => {
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this.emit('load', hit);
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});
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return;
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}
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const data = await fetchData(key);
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this._cache.set(key, data);
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this.emit('load', data);
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};
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```
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## Class: `ReadableByteStreamController`
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<!-- YAML
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added: v18.0.0
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-->
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> Stability: 1 - Experimental.
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A browser-compatible implementation of [`ReadableByteStreamController`][].
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## Class: `ReadableStream`
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<!-- YAML
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added: v18.0.0
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-->
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> Stability: 1 - Experimental.
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A browser-compatible implementation of [`ReadableStream`][].
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## Class: `ReadableStreamBYOBReader`
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<!-- YAML
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added: v18.0.0
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-->
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> Stability: 1 - Experimental.
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A browser-compatible implementation of [`ReadableStreamBYOBReader`][].
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## Class: `ReadableStreamBYOBRequest`
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<!-- YAML
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added: v18.0.0
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-->
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> Stability: 1 - Experimental.
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A browser-compatible implementation of [`ReadableStreamBYOBRequest`][].
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## Class: `ReadableStreamDefaultController`
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<!-- YAML
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added: v18.0.0
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-->
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> Stability: 1 - Experimental.
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A browser-compatible implementation of [`ReadableStreamDefaultController`][].
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## Class: `ReadableStreamDefaultReader`
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<!-- YAML
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added: v18.0.0
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-->
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> Stability: 1 - Experimental.
|
|
|
|
A browser-compatible implementation of [`ReadableStreamDefaultReader`][].
|
|
|
|
## `require()`
|
|
|
|
This variable may appear to be global but is not. See [`require()`][].
|
|
|
|
## `Response`
|
|
|
|
<!-- YAML
|
|
added:
|
|
- v17.5.0
|
|
- v16.15.0
|
|
-->
|
|
|
|
> Stability: 1 - Experimental. Disable this API with the [`--no-experimental-fetch`][]
|
|
> CLI flag.
|
|
|
|
A browser-compatible implementation of {Response}.
|
|
|
|
## `Request`
|
|
|
|
<!-- YAML
|
|
added:
|
|
- v17.5.0
|
|
- v16.15.0
|
|
-->
|
|
|
|
> Stability: 1 - Experimental. Disable this API with the [`--no-experimental-fetch`][]
|
|
> CLI flag.
|
|
|
|
A browser-compatible implementation of {Request}.
|
|
|
|
## `setImmediate(callback[, ...args])`
|
|
|
|
<!-- YAML
|
|
added: v0.9.1
|
|
-->
|
|
|
|
<!-- type=global -->
|
|
|
|
[`setImmediate`][] is described in the [timers][] section.
|
|
|
|
## `setInterval(callback, delay[, ...args])`
|
|
|
|
<!-- YAML
|
|
added: v0.0.1
|
|
-->
|
|
|
|
<!-- type=global -->
|
|
|
|
[`setInterval`][] is described in the [timers][] section.
|
|
|
|
## `setTimeout(callback, delay[, ...args])`
|
|
|
|
<!-- YAML
|
|
added: v0.0.1
|
|
-->
|
|
|
|
<!-- type=global -->
|
|
|
|
[`setTimeout`][] is described in the [timers][] section.
|
|
|
|
## `structuredClone(value[, options])`
|
|
|
|
<!-- YAML
|
|
added: v17.0.0
|
|
-->
|
|
|
|
<!-- type=global -->
|
|
|
|
The WHATWG [`structuredClone`][] method.
|
|
|
|
## `SubtleCrypto`
|
|
|
|
<!-- YAML
|
|
added:
|
|
- v17.6.0
|
|
- v16.15.0
|
|
-->
|
|
|
|
> Stability: 1 - Experimental. Enable this API with the
|
|
> [`--experimental-global-webcrypto`][] CLI flag.
|
|
|
|
A browser-compatible implementation of {SubtleCrypto}. This global is available
|
|
only if the Node.js binary was compiled with including support for the
|
|
`node:crypto` module.
|
|
|
|
## `DOMException`
|
|
|
|
<!-- YAML
|
|
added: v17.0.0
|
|
-->
|
|
|
|
<!-- type=global -->
|
|
|
|
The WHATWG `DOMException` class. See [`DOMException`][] for more details.
|
|
|
|
## `TextDecoder`
|
|
|
|
<!-- YAML
|
|
added: v11.0.0
|
|
-->
|
|
|
|
<!-- type=global -->
|
|
|
|
The WHATWG `TextDecoder` class. See the [`TextDecoder`][] section.
|
|
|
|
## Class: `TextDecoderStream`
|
|
|
|
<!-- YAML
|
|
added: v18.0.0
|
|
-->
|
|
|
|
> Stability: 1 - Experimental.
|
|
|
|
A browser-compatible implementation of [`TextDecoderStream`][].
|
|
|
|
## `TextEncoder`
|
|
|
|
<!-- YAML
|
|
added: v11.0.0
|
|
-->
|
|
|
|
<!-- type=global -->
|
|
|
|
The WHATWG `TextEncoder` class. See the [`TextEncoder`][] section.
|
|
|
|
## Class: `TextEncoderStream`
|
|
|
|
<!-- YAML
|
|
added: v18.0.0
|
|
-->
|
|
|
|
> Stability: 1 - Experimental.
|
|
|
|
A browser-compatible implementation of [`TextEncoderStream`][].
|
|
|
|
## Class: `TransformStream`
|
|
|
|
<!-- YAML
|
|
added: v18.0.0
|
|
-->
|
|
|
|
> Stability: 1 - Experimental.
|
|
|
|
A browser-compatible implementation of [`TransformStream`][].
|
|
|
|
## Class: `TransformStreamDefaultController`
|
|
|
|
<!-- YAML
|
|
added: v18.0.0
|
|
-->
|
|
|
|
> Stability: 1 - Experimental.
|
|
|
|
A browser-compatible implementation of [`TransformStreamDefaultController`][].
|
|
|
|
## `URL`
|
|
|
|
<!-- YAML
|
|
added: v10.0.0
|
|
-->
|
|
|
|
<!-- type=global -->
|
|
|
|
The WHATWG `URL` class. See the [`URL`][] section.
|
|
|
|
## `URLSearchParams`
|
|
|
|
<!-- YAML
|
|
added: v10.0.0
|
|
-->
|
|
|
|
<!-- type=global -->
|
|
|
|
The WHATWG `URLSearchParams` class. See the [`URLSearchParams`][] section.
|
|
|
|
## `WebAssembly`
|
|
|
|
<!-- YAML
|
|
added: v8.0.0
|
|
-->
|
|
|
|
<!-- type=global -->
|
|
|
|
* {Object}
|
|
|
|
The object that acts as the namespace for all W3C
|
|
[WebAssembly][webassembly-org] related functionality. See the
|
|
[Mozilla Developer Network][webassembly-mdn] for usage and compatibility.
|
|
|
|
## Class: `WritableStream`
|
|
|
|
<!-- YAML
|
|
added: v18.0.0
|
|
-->
|
|
|
|
> Stability: 1 - Experimental.
|
|
|
|
A browser-compatible implementation of [`WritableStream`][].
|
|
|
|
## Class: `WritableStreamDefaultController`
|
|
|
|
<!-- YAML
|
|
added: v18.0.0
|
|
-->
|
|
|
|
> Stability: 1 - Experimental.
|
|
|
|
A browser-compatible implementation of [`WritableStreamDefaultController`][].
|
|
|
|
## Class: `WritableStreamDefaultWriter`
|
|
|
|
<!-- YAML
|
|
added: v18.0.0
|
|
-->
|
|
|
|
> Stability: 1 - Experimental.
|
|
|
|
A browser-compatible implementation of [`WritableStreamDefaultWriter`][].
|
|
|
|
[Web Crypto API]: webcrypto.md
|
|
[`--experimental-global-customevent`]: cli.md#--experimental-global-customevent
|
|
[`--experimental-global-webcrypto`]: cli.md#--experimental-global-webcrypto
|
|
[`--no-experimental-fetch`]: cli.md#--no-experimental-fetch
|
|
[`AbortController`]: https://developer.mozilla.org/en-US/docs/Web/API/AbortController
|
|
[`ByteLengthQueuingStrategy`]: webstreams.md#class-bytelengthqueuingstrategy
|
|
[`CompressionStream`]: webstreams.md#class-compressionstream
|
|
[`CountQueuingStrategy`]: webstreams.md#class-countqueuingstrategy
|
|
[`CustomEvent` Web API]: https://dom.spec.whatwg.org/#customevent
|
|
[`DOMException`]: https://developer.mozilla.org/en-US/docs/Web/API/DOMException
|
|
[`DecompressionStream`]: webstreams.md#class-decompressionstream
|
|
[`EventTarget` and `Event` API]: events.md#eventtarget-and-event-api
|
|
[`MessageChannel`]: worker_threads.md#class-messagechannel
|
|
[`MessageEvent`]: https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent/MessageEvent
|
|
[`MessagePort`]: worker_threads.md#class-messageport
|
|
[`ReadableByteStreamController`]: webstreams.md#class-readablebytestreamcontroller
|
|
[`ReadableStreamBYOBReader`]: webstreams.md#class-readablestreambyobreader
|
|
[`ReadableStreamBYOBRequest`]: webstreams.md#class-readablestreambyobrequest
|
|
[`ReadableStreamDefaultController`]: webstreams.md#class-readablestreamdefaultcontroller
|
|
[`ReadableStreamDefaultReader`]: webstreams.md#class-readablestreamdefaultreader
|
|
[`ReadableStream`]: webstreams.md#class-readablestream
|
|
[`TextDecoderStream`]: webstreams.md#class-textdecoderstream
|
|
[`TextDecoder`]: util.md#class-utiltextdecoder
|
|
[`TextEncoderStream`]: webstreams.md#class-textencoderstream
|
|
[`TextEncoder`]: util.md#class-utiltextencoder
|
|
[`TransformStreamDefaultController`]: webstreams.md#class-transformstreamdefaultcontroller
|
|
[`TransformStream`]: webstreams.md#class-transformstream
|
|
[`URLSearchParams`]: url.md#class-urlsearchparams
|
|
[`URL`]: url.md#class-url
|
|
[`WritableStreamDefaultController`]: webstreams.md#class-writablestreamdefaultcontroller
|
|
[`WritableStreamDefaultWriter`]: webstreams.md#class-writablestreamdefaultwriter
|
|
[`WritableStream`]: webstreams.md#class-writablestream
|
|
[`__dirname`]: modules.md#__dirname
|
|
[`__filename`]: modules.md#__filename
|
|
[`buffer.atob()`]: buffer.md#bufferatobdata
|
|
[`buffer.btoa()`]: buffer.md#bufferbtoadata
|
|
[`clearImmediate`]: timers.md#clearimmediateimmediate
|
|
[`clearInterval`]: timers.md#clearintervaltimeout
|
|
[`clearTimeout`]: timers.md#cleartimeouttimeout
|
|
[`console`]: console.md
|
|
[`exports`]: modules.md#exports
|
|
[`fetch()`]: https://developer.mozilla.org/en-US/docs/Web/API/fetch
|
|
[`module`]: modules.md#module
|
|
[`perf_hooks.performance`]: perf_hooks.md#perf_hooksperformance
|
|
[`process.nextTick()`]: process.md#processnexttickcallback-args
|
|
[`process` object]: process.md#process
|
|
[`require()`]: modules.md#requireid
|
|
[`setImmediate`]: timers.md#setimmediatecallback-args
|
|
[`setInterval`]: timers.md#setintervalcallback-delay-args
|
|
[`setTimeout`]: timers.md#settimeoutcallback-delay-args
|
|
[`structuredClone`]: https://developer.mozilla.org/en-US/docs/Web/API/structuredClone
|
|
[buffer section]: buffer.md
|
|
[built-in objects]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects
|
|
[module system documentation]: modules.md
|
|
[timers]: timers.md
|
|
[webassembly-mdn]: https://developer.mozilla.org/en-US/docs/WebAssembly
|
|
[webassembly-org]: https://webassembly.org
|