@types/node/worker_threads.d.ts

/**
 * The `worker_threads` module enables the use of threads that execute JavaScript
 * in parallel. To access it:
 *
 * ```js
 * const worker = require('worker_threads');
 * ```
 *
 * Workers (threads) are useful for performing CPU-intensive JavaScript operations.
 * They do not help much with I/O-intensive work. The Node.js built-in
 * asynchronous I/O operations are more efficient than Workers can be.
 *
 * Unlike `child_process` or `cluster`, `worker_threads` can share memory. They do
 * so by transferring `ArrayBuffer` instances or sharing `SharedArrayBuffer`instances.
 *
 * ```js
 * const {
 *   Worker, isMainThread, parentPort, workerData
 * } = require('worker_threads');
 *
 * if (isMainThread) {
 *   module.exports = function parseJSAsync(script) {
 *     return new Promise((resolve, reject) => {
 *       const worker = new Worker(__filename, {
 *         workerData: script
 *       });
 *       worker.on('message', resolve);
 *       worker.on('error', reject);
 *       worker.on('exit', (code) => {
 *         if (code !== 0)
 *           reject(new Error(`Worker stopped with exit code ${code}`));
 *       });
 *     });
 *   };
 * } else {
 *   const { parse } = require('some-js-parsing-library');
 *   const script = workerData;
 *   parentPort.postMessage(parse(script));
 * }
 * ```
 *
 * The above example spawns a Worker thread for each `parse()` call. In actual
 * practice, use a pool of Workers for these kinds of tasks. Otherwise, the
 * overhead of creating Workers would likely exceed their benefit.
 *
 * When implementing a worker pool, use the `AsyncResource` API to inform
 * diagnostic tools (e.g. to provide asynchronous stack traces) about the
 * correlation between tasks and their outcomes. See `"Using AsyncResource for a Worker thread pool"` in the `async_hooks` documentation for an example implementation.
 *
 * Worker threads inherit non-process-specific options by default. Refer to `Worker constructor options` to know how to customize worker thread options,
 * specifically `argv` and `execArgv` options.
 * @see [source](https://github.com/nodejs/node/blob/v17.0.0/lib/worker_threads.js)
 */
declare module 'worker_threads' {
    import { Blob } from 'node:buffer';
    import { Context } from 'node:vm';
    import { EventEmitter } from 'node:events';
    import { EventLoopUtilityFunction } from 'node:perf_hooks';
    import { FileHandle } from 'node:fs/promises';
    import { Readable, Writable } from 'node:stream';
    import { URL } from 'node:url';
    import { X509Certificate } from 'node:crypto';
    const isMainThread: boolean;
    const parentPort: null | MessagePort;
    const resourceLimits: ResourceLimits;
    const SHARE_ENV: unique symbol;
    const threadId: number;
    const workerData: any;
    /**
     * Instances of the `worker.MessageChannel` class represent an asynchronous,
     * two-way communications channel.
     * The `MessageChannel` has no methods of its own. `new MessageChannel()`yields an object with `port1` and `port2` properties, which refer to linked `MessagePort` instances.
     *
     * ```js
     * const { MessageChannel } = require('worker_threads');
     *
     * const { port1, port2 } = new MessageChannel();
     * port1.on('message', (message) => console.log('received', message));
     * port2.postMessage({ foo: 'bar' });
     * // Prints: received { foo: 'bar' } from the `port1.on('message')` listener
     * ```
     * @since v10.5.0
     */
    class MessageChannel {
        readonly port1: MessagePort;
        readonly port2: MessagePort;
    }
    interface WorkerPerformance {
        eventLoopUtilization: EventLoopUtilityFunction;
    }
    type TransferListItem = ArrayBuffer | MessagePort | FileHandle | X509Certificate | Blob;
    /**
     * Instances of the `worker.MessagePort` class represent one end of an
     * asynchronous, two-way communications channel. It can be used to transfer
     * structured data, memory regions and other `MessagePort`s between different `Worker` s.
     *
     * This implementation matches [browser `MessagePort`](https://developer.mozilla.org/en-US/docs/Web/API/MessagePort) s.
     * @since v10.5.0
     */
    class MessagePort extends EventEmitter {
        /**
         * Disables further sending of messages on either side of the connection.
         * This method can be called when no further communication will happen over this`MessagePort`.
         *
         * The `'close' event` is emitted on both `MessagePort` instances that
         * are part of the channel.
         * @since v10.5.0
         */
        close(): void;
        /**
         * Sends a JavaScript value to the receiving side of this channel.`value` is transferred in a way which is compatible with
         * the [HTML structured clone algorithm](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm).
         *
         * In particular, the significant differences to `JSON` are:
         *
         * * `value` may contain circular references.
         * * `value` may contain instances of builtin JS types such as `RegExp`s,`BigInt`s, `Map`s, `Set`s, etc.
         * * `value` may contain typed arrays, both using `ArrayBuffer`s
         * and `SharedArrayBuffer`s.
         * * `value` may contain [`WebAssembly.Module`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Module) instances.
         * * `value` may not contain native (C++-backed) objects other than:
         *
         * ```js
         * const { MessageChannel } = require('worker_threads');
         * const { port1, port2 } = new MessageChannel();
         *
         * port1.on('message', (message) => console.log(message));
         *
         * const circularData = {};
         * circularData.foo = circularData;
         * // Prints: { foo: [Circular] }
         * port2.postMessage(circularData);
         * ```
         *
         * `transferList` may be a list of [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer), `MessagePort` and `FileHandle` objects.
         * After transferring, they are not usable on the sending side of the channel
         * anymore (even if they are not contained in `value`). Unlike with `child processes`, transferring handles such as network sockets is currently
         * not supported.
         *
         * If `value` contains [`SharedArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SharedArrayBuffer) instances, those are accessible
         * from either thread. They cannot be listed in `transferList`.
         *
         * `value` may still contain `ArrayBuffer` instances that are not in`transferList`; in that case, the underlying memory is copied rather than moved.
         *
         * ```js
         * const { MessageChannel } = require('worker_threads');
         * const { port1, port2 } = new MessageChannel();
         *
         * port1.on('message', (message) => console.log(message));
         *
         * const uint8Array = new Uint8Array([ 1, 2, 3, 4 ]);
         * // This posts a copy of `uint8Array`:
         * port2.postMessage(uint8Array);
         * // This does not copy data, but renders `uint8Array` unusable:
         * port2.postMessage(uint8Array, [ uint8Array.buffer ]);
         *
         * // The memory for the `sharedUint8Array` is accessible from both the
         * // original and the copy received by `.on('message')`:
         * const sharedUint8Array = new Uint8Array(new SharedArrayBuffer(4));
         * port2.postMessage(sharedUint8Array);
         *
         * // This transfers a freshly created message port to the receiver.
         * // This can be used, for example, to create communication channels between
         * // multiple `Worker` threads that are children of the same parent thread.
         * const otherChannel = new MessageChannel();
         * port2.postMessage({ port: otherChannel.port1 }, [ otherChannel.port1 ]);
         * ```
         *
         * The message object is cloned immediately, and can be modified after
         * posting without having side effects.
         *
         * For more information on the serialization and deserialization mechanisms
         * behind this API, see the `serialization API of the v8 module`.
         * @since v10.5.0
         */
        postMessage(value: any, transferList?: ReadonlyArray<TransferListItem>): void;
        /**
         * Opposite of `unref()`. Calling `ref()` on a previously `unref()`ed port does_not_ let the program exit if it's the only active handle left (the default
         * behavior). If the port is `ref()`ed, calling `ref()` again has no effect.
         *
         * If listeners are attached or removed using `.on('message')`, the port
         * is `ref()`ed and `unref()`ed automatically depending on whether
         * listeners for the event exist.
         * @since v10.5.0
         */
        ref(): void;
        /**
         * Calling `unref()` on a port allows the thread to exit if this is the only
         * active handle in the event system. If the port is already `unref()`ed calling`unref()` again has no effect.
         *
         * If listeners are attached or removed using `.on('message')`, the port is`ref()`ed and `unref()`ed automatically depending on whether
         * listeners for the event exist.
         * @since v10.5.0
         */
        unref(): void;
        /**
         * Starts receiving messages on this `MessagePort`. When using this port
         * as an event emitter, this is called automatically once `'message'`listeners are attached.
         *
         * This method exists for parity with the Web `MessagePort` API. In Node.js,
         * it is only useful for ignoring messages when no event listener is present.
         * Node.js also diverges in its handling of `.onmessage`. Setting it
         * automatically calls `.start()`, but unsetting it lets messages queue up
         * until a new handler is set or the port is discarded.
         * @since v10.5.0
         */
        start(): void;
        addListener(event: 'close', listener: () => void): this;
        addListener(event: 'message', listener: (value: any) => void): this;
        addListener(event: 'messageerror', listener: (error: Error) => void): this;
        addListener(event: string | symbol, listener: (...args: any[]) => void): this;
        emit(event: 'close'): boolean;
        emit(event: 'message', value: any): boolean;
        emit(event: 'messageerror', error: Error): boolean;
        emit(event: string | symbol, ...args: any[]): boolean;
        on(event: 'close', listener: () => void): this;
        on(event: 'message', listener: (value: any) => void): this;
        on(event: 'messageerror', listener: (error: Error) => void): this;
        on(event: string | symbol, listener: (...args: any[]) => void): this;
        once(event: 'close', listener: () => void): this;
        once(event: 'message', listener: (value: any) => void): this;
        once(event: 'messageerror', listener: (error: Error) => void): this;
        once(event: string | symbol, listener: (...args: any[]) => void): this;
        prependListener(event: 'close', listener: () => void): this;
        prependListener(event: 'message', listener: (value: any) => void): this;
        prependListener(event: 'messageerror', listener: (error: Error) => void): this;
        prependListener(event: string | symbol, listener: (...args: any[]) => void): this;
        prependOnceListener(event: 'close', listener: () => void): this;
        prependOnceListener(event: 'message', listener: (value: any) => void): this;
        prependOnceListener(event: 'messageerror', listener: (error: Error) => void): this;
        prependOnceListener(event: string | symbol, listener: (...args: any[]) => void): this;
        removeListener(event: 'close', listener: () => void): this;
        removeListener(event: 'message', listener: (value: any) => void): this;
        removeListener(event: 'messageerror', listener: (error: Error) => void): this;
        removeListener(event: string | symbol, listener: (...args: any[]) => void): this;
        off(event: 'close', listener: () => void): this;
        off(event: 'message', listener: (value: any) => void): this;
        off(event: 'messageerror', listener: (error: Error) => void): this;
        off(event: string | symbol, listener: (...args: any[]) => void): this;
    }
    interface WorkerOptions {
        /**
         * List of arguments which would be stringified and appended to
         * `process.argv` in the worker. This is mostly similar to the `workerData`
         * but the values will be available on the global `process.argv` as if they
         * were passed as CLI options to the script.
         */
        argv?: any[] | undefined;
        env?: NodeJS.Dict<string> | typeof SHARE_ENV | undefined;
        eval?: boolean | undefined;
        workerData?: any;
        stdin?: boolean | undefined;
        stdout?: boolean | undefined;
        stderr?: boolean | undefined;
        execArgv?: string[] | undefined;
        resourceLimits?: ResourceLimits | undefined;
        /**
         * Additional data to send in the first worker message.
         */
        transferList?: TransferListItem[] | undefined;
        /**
         * @default true
         */
        trackUnmanagedFds?: boolean | undefined;
    }
    interface ResourceLimits {
        /**
         * The maximum size of a heap space for recently created objects.
         */
        maxYoungGenerationSizeMb?: number | undefined;
        /**
         * The maximum size of the main heap in MB.
         */
        maxOldGenerationSizeMb?: number | undefined;
        /**
         * The size of a pre-allocated memory range used for generated code.
         */
        codeRangeSizeMb?: number | undefined;
        /**
         * The default maximum stack size for the thread. Small values may lead to unusable Worker instances.
         * @default 4
         */
        stackSizeMb?: number | undefined;
    }
    /**
     * The `Worker` class represents an independent JavaScript execution thread.
     * Most Node.js APIs are available inside of it.
     *
     * Notable differences inside a Worker environment are:
     *
     * * The `process.stdin`, `process.stdout` and `process.stderr` may be redirected by the parent thread.
     * * The `require('worker_threads').isMainThread` property is set to `false`.
     * * The `require('worker_threads').parentPort` message port is available.
     * * `process.exit()` does not stop the whole program, just the single thread,
     * and `process.abort()` is not available.
     * * `process.chdir()` and `process` methods that set group or user ids
     * are not available.
     * * `process.env` is a copy of the parent thread's environment variables,
     * unless otherwise specified. Changes to one copy are not visible in other
     * threads, and are not visible to native add-ons (unless `worker.SHARE_ENV` is passed as the `env` option to the `Worker` constructor).
     * * `process.title` cannot be modified.
     * * Signals are not delivered through `process.on('...')`.
     * * Execution may stop at any point as a result of `worker.terminate()` being invoked.
     * * IPC channels from parent processes are not accessible.
     * * The `trace_events` module is not supported.
     * * Native add-ons can only be loaded from multiple threads if they fulfill `certain conditions`.
     *
     * Creating `Worker` instances inside of other `Worker`s is possible.
     *
     * Like [Web Workers](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API) and the `cluster module`, two-way communication can be
     * achieved through inter-thread message passing. Internally, a `Worker` has a
     * built-in pair of `MessagePort` s that are already associated with each other
     * when the `Worker` is created. While the `MessagePort` object on the parent side
     * is not directly exposed, its functionalities are exposed through `worker.postMessage()` and the `worker.on('message')` event
     * on the `Worker` object for the parent thread.
     *
     * To create custom messaging channels (which is encouraged over using the default
     * global channel because it facilitates separation of concerns), users can create
     * a `MessageChannel` object on either thread and pass one of the`MessagePort`s on that `MessageChannel` to the other thread through a
     * pre-existing channel, such as the global one.
     *
     * See `port.postMessage()` for more information on how messages are passed,
     * and what kind of JavaScript values can be successfully transported through
     * the thread barrier.
     *
     * ```js
     * const assert = require('assert');
     * const {
     *   Worker, MessageChannel, MessagePort, isMainThread, parentPort
     * } = require('worker_threads');
     * if (isMainThread) {
     *   const worker = new Worker(__filename);
     *   const subChannel = new MessageChannel();
     *   worker.postMessage({ hereIsYourPort: subChannel.port1 }, [subChannel.port1]);
     *   subChannel.port2.on('message', (value) => {
     *     console.log('received:', value);
     *   });
     * } else {
     *   parentPort.once('message', (value) => {
     *     assert(value.hereIsYourPort instanceof MessagePort);
     *     value.hereIsYourPort.postMessage('the worker is sending this');
     *     value.hereIsYourPort.close();
     *   });
     * }
     * ```
     * @since v10.5.0
     */
    class Worker extends EventEmitter {
        /**
         * If `stdin: true` was passed to the `Worker` constructor, this is a
         * writable stream. The data written to this stream will be made available in
         * the worker thread as `process.stdin`.
         * @since v10.5.0
         */
        readonly stdin: Writable | null;
        /**
         * This is a readable stream which contains data written to `process.stdout` inside the worker thread. If `stdout: true` was not passed to the `Worker` constructor, then data is piped to the
         * parent thread's `process.stdout` stream.
         * @since v10.5.0
         */
        readonly stdout: Readable;
        /**
         * This is a readable stream which contains data written to `process.stderr` inside the worker thread. If `stderr: true` was not passed to the `Worker` constructor, then data is piped to the
         * parent thread's `process.stderr` stream.
         * @since v10.5.0
         */
        readonly stderr: Readable;
        /**
         * An integer identifier for the referenced thread. Inside the worker thread,
         * it is available as `require('worker_threads').threadId`.
         * This value is unique for each `Worker` instance inside a single process.
         * @since v10.5.0
         */
        readonly threadId: number;
        /**
         * Provides the set of JS engine resource constraints for this Worker thread.
         * If the `resourceLimits` option was passed to the `Worker` constructor,
         * this matches its values.
         *
         * If the worker has stopped, the return value is an empty object.
         * @since v13.2.0, v12.16.0
         */
        readonly resourceLimits?: ResourceLimits | undefined;
        /**
         * An object that can be used to query performance information from a worker
         * instance. Similar to `perf_hooks.performance`.
         * @since v15.1.0, v14.17.0, v12.22.0
         */
        readonly performance: WorkerPerformance;
        /**
         * @param filename  The path to the Worker’s main script or module.
         *                  Must be either an absolute path or a relative path (i.e. relative to the current working directory) starting with ./ or ../,
         *                  or a WHATWG URL object using file: protocol. If options.eval is true, this is a string containing JavaScript code rather than a path.
         */
        constructor(filename: string | URL, options?: WorkerOptions);
        /**
         * Send a message to the worker that is received via `require('worker_threads').parentPort.on('message')`.
         * See `port.postMessage()` for more details.
         * @since v10.5.0
         */
        postMessage(value: any, transferList?: ReadonlyArray<TransferListItem>): void;
        /**
         * Opposite of `unref()`, calling `ref()` on a previously `unref()`ed worker does_not_ let the program exit if it's the only active handle left (the default
         * behavior). If the worker is `ref()`ed, calling `ref()` again has
         * no effect.
         * @since v10.5.0
         */
        ref(): void;
        /**
         * Calling `unref()` on a worker allows the thread to exit if this is the only
         * active handle in the event system. If the worker is already `unref()`ed calling`unref()` again has no effect.
         * @since v10.5.0
         */
        unref(): void;
        /**
         * Stop all JavaScript execution in the worker thread as soon as possible.
         * Returns a Promise for the exit code that is fulfilled when the `'exit' event` is emitted.
         * @since v10.5.0
         */
        terminate(): Promise<number>;
        /**
         * Returns a readable stream for a V8 snapshot of the current state of the Worker.
         * See `v8.getHeapSnapshot()` for more details.
         *
         * If the Worker thread is no longer running, which may occur before the `'exit' event` is emitted, the returned `Promise` is rejected
         * immediately with an `ERR_WORKER_NOT_RUNNING` error.
         * @since v13.9.0, v12.17.0
         * @return A promise for a Readable Stream containing a V8 heap snapshot
         */
        getHeapSnapshot(): Promise<Readable>;
        addListener(event: 'error', listener: (err: Error) => void): this;
        addListener(event: 'exit', listener: (exitCode: number) => void): this;
        addListener(event: 'message', listener: (value: any) => void): this;
        addListener(event: 'messageerror', listener: (error: Error) => void): this;
        addListener(event: 'online', listener: () => void): this;
        addListener(event: string | symbol, listener: (...args: any[]) => void): this;
        emit(event: 'error', err: Error): boolean;
        emit(event: 'exit', exitCode: number): boolean;
        emit(event: 'message', value: any): boolean;
        emit(event: 'messageerror', error: Error): boolean;
        emit(event: 'online'): boolean;
        emit(event: string | symbol, ...args: any[]): boolean;
        on(event: 'error', listener: (err: Error) => void): this;
        on(event: 'exit', listener: (exitCode: number) => void): this;
        on(event: 'message', listener: (value: any) => void): this;
        on(event: 'messageerror', listener: (error: Error) => void): this;
        on(event: 'online', listener: () => void): this;
        on(event: string | symbol, listener: (...args: any[]) => void): this;
        once(event: 'error', listener: (err: Error) => void): this;
        once(event: 'exit', listener: (exitCode: number) => void): this;
        once(event: 'message', listener: (value: any) => void): this;
        once(event: 'messageerror', listener: (error: Error) => void): this;
        once(event: 'online', listener: () => void): this;
        once(event: string | symbol, listener: (...args: any[]) => void): this;
        prependListener(event: 'error', listener: (err: Error) => void): this;
        prependListener(event: 'exit', listener: (exitCode: number) => void): this;
        prependListener(event: 'message', listener: (value: any) => void): this;
        prependListener(event: 'messageerror', listener: (error: Error) => void): this;
        prependListener(event: 'online', listener: () => void): this;
        prependListener(event: string | symbol, listener: (...args: any[]) => void): this;
        prependOnceListener(event: 'error', listener: (err: Error) => void): this;
        prependOnceListener(event: 'exit', listener: (exitCode: number) => void): this;
        prependOnceListener(event: 'message', listener: (value: any) => void): this;
        prependOnceListener(event: 'messageerror', listener: (error: Error) => void): this;
        prependOnceListener(event: 'online', listener: () => void): this;
        prependOnceListener(event: string | symbol, listener: (...args: any[]) => void): this;
        removeListener(event: 'error', listener: (err: Error) => void): this;
        removeListener(event: 'exit', listener: (exitCode: number) => void): this;
        removeListener(event: 'message', listener: (value: any) => void): this;
        removeListener(event: 'messageerror', listener: (error: Error) => void): this;
        removeListener(event: 'online', listener: () => void): this;
        removeListener(event: string | symbol, listener: (...args: any[]) => void): this;
        off(event: 'error', listener: (err: Error) => void): this;
        off(event: 'exit', listener: (exitCode: number) => void): this;
        off(event: 'message', listener: (value: any) => void): this;
        off(event: 'messageerror', listener: (error: Error) => void): this;
        off(event: 'online', listener: () => void): this;
        off(event: string | symbol, listener: (...args: any[]) => void): this;
    }
    interface BroadcastChannel extends NodeJS.RefCounted {}
    /**
     * Instances of `BroadcastChannel` allow asynchronous one-to-many communication
     * with all other `BroadcastChannel` instances bound to the same channel name.
     *
     * ```js
     * 'use strict';
     *
     * const {
     *   isMainThread,
     *   BroadcastChannel,
     *   Worker
     * } = require('worker_threads');
     *
     * const bc = new BroadcastChannel('hello');
     *
     * if (isMainThread) {
     *   let c = 0;
     *   bc.onmessage = (event) => {
     *     console.log(event.data);
     *     if (++c === 10) bc.close();
     *   };
     *   for (let n = 0; n < 10; n++)
     *     new Worker(__filename);
     * } else {
     *   bc.postMessage('hello from every worker');
     *   bc.close();
     * }
     * ```
     * @since v15.4.0
     * @experimental
     */
    class BroadcastChannel {
        readonly name: string;
        /**
         * Invoked with a single \`MessageEvent\` argument when a message is received.
         * @since v15.4.0
         */
        onmessage: (message: unknown) => void;
        /**
         * Invoked with a received message cannot be deserialized.
         * @since v15.4.0
         */
        onmessageerror: (message: unknown) => void;
        constructor(name: string);
        /**
         * Closes the `BroadcastChannel` connection.
         * @since v15.4.0
         */
        close(): void;
        /**
         * @since v15.4.0
         * @param message Any cloneable JavaScript value.
         */
        postMessage(message: unknown): void;
    }
    /**
     * Mark an object as not transferable. If `object` occurs in the transfer list of
     * a `port.postMessage()` call, it is ignored.
     *
     * In particular, this makes sense for objects that can be cloned, rather than
     * transferred, and which are used by other objects on the sending side.
     * For example, Node.js marks the `ArrayBuffer`s it uses for its `Buffer pool` with this.
     *
     * This operation cannot be undone.
     *
     * ```js
     * const { MessageChannel, markAsUntransferable } = require('worker_threads');
     *
     * const pooledBuffer = new ArrayBuffer(8);
     * const typedArray1 = new Uint8Array(pooledBuffer);
     * const typedArray2 = new Float64Array(pooledBuffer);
     *
     * markAsUntransferable(pooledBuffer);
     *
     * const { port1 } = new MessageChannel();
     * port1.postMessage(typedArray1, [ typedArray1.buffer ]);
     *
     * // The following line prints the contents of typedArray1 -- it still owns
     * // its memory and has been cloned, not transferred. Without
     * // `markAsUntransferable()`, this would print an empty Uint8Array.
     * // typedArray2 is intact as well.
     * console.log(typedArray1);
     * console.log(typedArray2);
     * ```
     *
     * There is no equivalent to this API in browsers.
     * @since v14.5.0, v12.19.0
     */
    function markAsUntransferable(object: object): void;
    /**
     * Transfer a `MessagePort` to a different `vm` Context. The original `port`object is rendered unusable, and the returned `MessagePort` instance
     * takes its place.
     *
     * The returned `MessagePort` is an object in the target context and
     * inherits from its global `Object` class. Objects passed to the [`port.onmessage()`](https://developer.mozilla.org/en-US/docs/Web/API/MessagePort/onmessage) listener are also created in the
     * target context
     * and inherit from its global `Object` class.
     *
     * However, the created `MessagePort` no longer inherits from [`EventTarget`](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget), and only
     * [`port.onmessage()`](https://developer.mozilla.org/en-US/docs/Web/API/MessagePort/onmessage) can be used to receive
     * events using it.
     * @since v11.13.0
     * @param port The message port to transfer.
     * @param contextifiedSandbox A `contextified` object as returned by the `vm.createContext()` method.
     */
    function moveMessagePortToContext(port: MessagePort, contextifiedSandbox: Context): MessagePort;
    /**
     * Receive a single message from a given `MessagePort`. If no message is available,`undefined` is returned, otherwise an object with a single `message` property
     * that contains the message payload, corresponding to the oldest message in the`MessagePort`’s queue.
     *
     * ```js
     * const { MessageChannel, receiveMessageOnPort } = require('worker_threads');
     * const { port1, port2 } = new MessageChannel();
     * port1.postMessage({ hello: 'world' });
     *
     * console.log(receiveMessageOnPort(port2));
     * // Prints: { message: { hello: 'world' } }
     * console.log(receiveMessageOnPort(port2));
     * // Prints: undefined
     * ```
     *
     * When this function is used, no `'message'` event is emitted and the`onmessage` listener is not invoked.
     * @since v12.3.0
     */
    function receiveMessageOnPort(port: MessagePort):
        | {
              message: any;
          }
        | undefined;
    type Serializable = string | object | number | boolean | bigint;
    /**
     * Within a worker thread, `worker.getEnvironmentData()` returns a clone
     * of data passed to the spawning thread's `worker.setEnvironmentData()`.
     * Every new `Worker` receives its own copy of the environment data
     * automatically.
     *
     * ```js
     * const {
     *   Worker,
     *   isMainThread,
     *   setEnvironmentData,
     *   getEnvironmentData,
     * } = require('worker_threads');
     *
     * if (isMainThread) {
     *   setEnvironmentData('Hello', 'World!');
     *   const worker = new Worker(__filename);
     * } else {
     *   console.log(getEnvironmentData('Hello'));  // Prints 'World!'.
     * }
     * ```
     * @since v15.12.0, v14.18.0
     * @experimental
     * @param key Any arbitrary, cloneable JavaScript value that can be used as a {Map} key.
     */
    function getEnvironmentData(key: Serializable): Serializable;
    /**
     * The `worker.setEnvironmentData()` API sets the content of`worker.getEnvironmentData()` in the current thread and all new `Worker`instances spawned from the current context.
     * @since v15.12.0, v14.18.0
     * @experimental
     * @param key Any arbitrary, cloneable JavaScript value that can be used as a {Map} key.
     * @param value Any arbitrary, cloneable JavaScript value that will be cloned and passed automatically to all new `Worker` instances. If `value` is passed as `undefined`, any previously set value
     * for the `key` will be deleted.
     */
    function setEnvironmentData(key: Serializable, value: Serializable): void;
}
declare module 'node:worker_threads' {
    export * from 'worker_threads';
}