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constants.d.ts	623 B	-rw-rw-rw-
crypto.d.ts	177.9 KB	-rw-rw-rw-
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dns.d.ts	33.37 KB	-rw-rw-rw-
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Code Editor : cluster.d.ts

/**
 * Clusters of Node.js processes can be used to run multiple instances of Node.js
 * that can distribute workloads among their application threads. When process isolation
 * is not needed, use the [`worker_threads`](https://nodejs.org/docs/latest-v16.x/api/worker_threads.html)
 * module instead, which allows running multiple application threads within a single Node.js instance.
 *
 * The cluster module allows easy creation of child processes that all share
 * server ports.
 *
 * ```js
 * import cluster from 'node:cluster';
 * import http from 'node:http';
 * import { cpus } from 'node:os';
 * import process from 'node:process';
 *
 * const numCPUs = cpus().length;
 *
 * if (cluster.isPrimary) {
 *   console.log(`Primary ${process.pid} is running`);
 *
 *   // Fork workers.
 *   for (let i = 0; i < numCPUs; i++) {
 *     cluster.fork();
 *   }
 *
 *   cluster.on('exit', (worker, code, signal) => {
 *     console.log(`worker ${worker.process.pid} died`);
 *   });
 * } else {
 *   // Workers can share any TCP connection
 *   // In this case it is an HTTP server
 *   http.createServer((req, res) => {
 *     res.writeHead(200);
 *     res.end('hello world\n');
 *   }).listen(8000);
 *
 *   console.log(`Worker ${process.pid} started`);
 * }
 * ```
 *
 * Running Node.js will now share port 8000 between the workers:
 *
 * ```console
 * $ node server.js
 * Primary 3596 is running
 * Worker 4324 started
 * Worker 4520 started
 * Worker 6056 started
 * Worker 5644 started
 * ```
 *
 * On Windows, it is not yet possible to set up a named pipe server in a worker.
 * @see [source](https://github.com/nodejs/node/blob/v16.20.2/lib/cluster.js)
 */
declare module "cluster" {
    import * as child from "node:child_process";
    import EventEmitter = require("node:events");
    import * as net from "node:net";
    type SerializationType = "json" | "advanced";
    export interface ClusterSettings {
        /**
         * List of string arguments passed to the Node.js executable.
         * @default process.execArgv
         */
        execArgv?: string[] | undefined;
        /**
         * File path to worker file.
         * @default process.argv[1]
         */
        exec?: string | undefined;
        /**
         * String arguments passed to worker.
         * @default process.argv.slice(2)
         */
        args?: string[] | undefined;
        /**
         * Whether or not to send output to parent's stdio.
         * @default false
         */
        silent?: boolean | undefined;
        /**
         * Configures the stdio of forked processes. Because the cluster module relies on IPC to function, this configuration must
         * contain an `'ipc'` entry. When this option is provided, it overrides `silent`. See [`child_prcess.spawn()`](https://nodejs.org/docs/latest-v16.x/api/child_process.html#child_processspawncommand-args-options)'s
         * [`stdio`](https://nodejs.org/docs/latest-v16.x/api/child_process.html#optionsstdio).
         */
        stdio?: any[] | undefined;
        /**
         * Sets the user identity of the process. (See [`setuid(2)`](https://man7.org/linux/man-pages/man2/setuid.2.html).)
         */
        uid?: number | undefined;
        /**
         * Sets the group identity of the process. (See [`setgid(2)`](https://man7.org/linux/man-pages/man2/setgid.2.html).)
         */
        gid?: number | undefined;
        /**
         * Sets inspector port of worker. This can be a number, or a function that takes no arguments and returns a number.
         * By default each worker gets its own port, incremented from the primary's `process.debugPort`.
         */
        inspectPort?: number | (() => number) | undefined;
        /**
         * Specify the kind of serialization used for sending messages between processes. Possible values are `'json'` and `'advanced'`.
         * See [Advanced serialization for `child_process`](https://nodejs.org/docs/latest-v16.x/api/child_process.html#advanced-serialization) for more details.
         * @default false
         */
        serialization?: SerializationType | undefined;
        /**
         * Current working directory of the worker process.
         * @default undefined (inherits from parent process)
         */
        cwd?: string | undefined;
        /**
         * Hide the forked processes console window that would normally be created on Windows systems.
         * @default false
         */
        windowsHide?: boolean | undefined;
    }
    export interface Address {
        address: string;
        port: number;
        /**
         * The `addressType` is one of:
         *
         * * `4` (TCPv4)
         * * `6` (TCPv6)
         * * `-1` (Unix domain socket)
         * * `'udp4'` or `'udp6'` (UDPv4 or UDPv6)
         */
        addressType: 4 | 6 | -1 | "udp4" | "udp6";
    }
    /**
     * A `Worker` object contains all public information and method about a worker.
     * In the primary it can be obtained using `cluster.workers`. In a worker
     * it can be obtained using `cluster.worker`.
     * @since v0.7.0
     */
    export class Worker extends EventEmitter {
        /**
         * Each new worker is given its own unique id, this id is stored in the `id`.
         *
         * While a worker is alive, this is the key that indexes it in `cluster.workers`.
         * @since v0.8.0
         */
        id: number;
        /**
         * All workers are created using [`child_process.fork()`](https://nodejs.org/docs/latest-v16.x/api/child_process.html#child_processforkmodulepath-args-options), the returned object
         * from this function is stored as `.process`. In a worker, the global `process` is stored.
         *
         * See: [Child Process module](https://nodejs.org/docs/latest-v16.x/api/child_process.html#child_processforkmodulepath-args-options).
         *
         * Workers will call `process.exit(0)` if the `'disconnect'` event occurs
         * on `process` and `.exitedAfterDisconnect` is not `true`. This protects against
         * accidental disconnection.
         * @since v0.7.0
         */
        process: child.ChildProcess;
        /**
         * Send a message to a worker or primary, optionally with a handle.
         *
         * In the primary, this sends a message to a specific worker. It is identical to [`ChildProcess.send()`](https://nodejs.org/docs/latest-v16.x/api/child_process.html#subprocesssendmessage-sendhandle-options-callback).
         *
         * In a worker, this sends a message to the primary. It is identical to `process.send()`.
         *
         * This example will echo back all messages from the primary:
         *
         * ```js
         * if (cluster.isPrimary) {
         *   const worker = cluster.fork();
         *   worker.send('hi there');
         *
         * } else if (cluster.isWorker) {
         *   process.on('message', (msg) => {
         *     process.send(msg);
         *   });
         * }
         * ```
         * @since v0.7.0
         * @param options The `options` argument, if present, is an object used to parameterize the sending of certain types of handles.
         */
        send(message: child.Serializable, callback?: (error: Error | null) => void): boolean;
        send(
            message: child.Serializable,
            sendHandle: child.SendHandle,
            callback?: (error: Error | null) => void,
        ): boolean;
        send(
            message: child.Serializable,
            sendHandle: child.SendHandle,
            options?: child.MessageOptions,
            callback?: (error: Error | null) => void,
        ): boolean;
        /**
         * This function will kill the worker. In the primary worker, it does this by
         * disconnecting the `worker.process`, and once disconnected, killing with `signal`. In the worker, it does it by killing the process with `signal`.
         *
         * The `kill()` function kills the worker process without waiting for a graceful
         * disconnect, it has the same behavior as `worker.process.kill()`.
         *
         * This method is aliased as `worker.destroy()` for backwards compatibility.
         *
         * In a worker, `process.kill()` exists, but it is not this function;
         * it is [`kill()`](https://nodejs.org/docs/latest-v16.x/api/process.html#processkillpid-signal).
         * @since v0.9.12
         * @param [signal='SIGTERM'] Name of the kill signal to send to the worker process.
         */
        kill(signal?: string): void;
        destroy(signal?: string): void;
        /**
         * In a worker, this function will close all servers, wait for the `'close'` event
         * on those servers, and then disconnect the IPC channel.
         *
         * In the primary, an internal message is sent to the worker causing it to call `.disconnect()` on itself.
         *
         * Causes `.exitedAfterDisconnect` to be set.
         *
         * After a server is closed, it will no longer accept new connections,
         * but connections may be accepted by any other listening worker. Existing
         * connections will be allowed to close as usual. When no more connections exist,
         * see `server.close()`, the IPC channel to the worker will close allowing it
         * to die gracefully.
         *
         * The above applies _only_ to server connections, client connections are not
         * automatically closed by workers, and disconnect does not wait for them to close
         * before exiting.
         *
         * In a worker, `process.disconnect` exists, but it is not this function;
         * it is `disconnect()`.
         *
         * Because long living server connections may block workers from disconnecting, it
         * may be useful to send a message, so application specific actions may be taken to
         * close them. It also may be useful to implement a timeout, killing a worker if
         * the `'disconnect'` event has not been emitted after some time.
         *
         * ```js
         * import net from 'node:net';
         * if (cluster.isPrimary) {
         *   const worker = cluster.fork();
         *   let timeout;
         *
         *   worker.on('listening', (address) => {
         *     worker.send('shutdown');
         *     worker.disconnect();
         *     timeout = setTimeout(() => {
         *       worker.kill();
         *     }, 2000);
         *   });
         *
         *   worker.on('disconnect', () => {
         *     clearTimeout(timeout);
         *   });
         *
         * } else if (cluster.isWorker) {
         *   const server = net.createServer((socket) => {
         *     // Connections never end
         *   });
         *
         *   server.listen(8000);
         *
         *   process.on('message', (msg) => {
         *     if (msg === 'shutdown') {
         *       // Initiate graceful close of any connections to server
         *     }
         *   });
         * }
         * ```
         * @since v0.7.7
         * @return A reference to `worker`.
         */
        disconnect(): void;
        /**
         * This function returns `true` if the worker is connected to its primary via its
         * IPC channel, `false` otherwise. A worker is connected to its primary after it
         * has been created. It is disconnected after the `'disconnect'` event is emitted.
         * @since v0.11.14
         */
        isConnected(): boolean;
        /**
         * This function returns `true` if the worker's process has terminated (either
         * because of exiting or being signaled). Otherwise, it returns `false`.
         *
         * ```js
         * import cluster from 'node:cluster';
         * import http from 'node:http';
         * import { cpus } from 'node:os';
         * import process from 'node:process';
         *
         * const numCPUs = cpus().length;
         *
         * if (cluster.isPrimary) {
         *   console.log(`Primary ${process.pid} is running`);
         *
         *   // Fork workers.
         *   for (let i = 0; i < numCPUs; i++) {
         *     cluster.fork();
         *   }
         *
         *   cluster.on('fork', (worker) => {
         *     console.log('worker is dead:', worker.isDead());
         *   });
         *
         *   cluster.on('exit', (worker, code, signal) => {
         *     console.log('worker is dead:', worker.isDead());
         *   });
         * } else {
         *   // Workers can share any TCP connection. In this case, it is an HTTP server.
         *   http.createServer((req, res) => {
         *     res.writeHead(200);
         *     res.end(`Current process\n ${process.pid}`);
         *     process.kill(process.pid);
         *   }).listen(8000);
         * }
         * ```
         * @since v0.11.14
         */
        isDead(): boolean;
        /**
         * This property is `true` if the worker exited due to `.disconnect()`.
         * If the worker exited any other way, it is `false`. If the
         * worker has not exited, it is `undefined`.
         *
         * The boolean `worker.exitedAfterDisconnect` allows distinguishing between
         * voluntary and accidental exit, the primary may choose not to respawn a worker
         * based on this value.
         *
         * ```js
         * cluster.on('exit', (worker, code, signal) => {
         *   if (worker.exitedAfterDisconnect === true) {
         *     console.log('Oh, it was just voluntary – no need to worry');
         *   }
         * });
         *
         * // kill worker
         * worker.kill();
         * ```
         * @since v6.0.0
         */
        exitedAfterDisconnect: boolean;
        /**
         * events.EventEmitter
         *   1. disconnect
         *   2. error
         *   3. exit
         *   4. listening
         *   5. message
         *   6. online
         */
        addListener(event: string, listener: (...args: any[]) => void): this;
        addListener(event: "disconnect", listener: () => void): this;
        addListener(event: "error", listener: (error: Error) => void): this;
        addListener(event: "exit", listener: (code: number, signal: string) => void): this;
        addListener(event: "listening", listener: (address: Address) => void): this;
        addListener(event: "message", listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined.
        addListener(event: "online", listener: () => void): this;
        emit(event: string | symbol, ...args: any[]): boolean;
        emit(event: "disconnect"): boolean;
        emit(event: "error", error: Error): boolean;
        emit(event: "exit", code: number, signal: string): boolean;
        emit(event: "listening", address: Address): boolean;
        emit(event: "message", message: any, handle: net.Socket | net.Server): boolean;
        emit(event: "online"): boolean;
        on(event: string, listener: (...args: any[]) => void): this;
        on(event: "disconnect", listener: () => void): this;
        on(event: "error", listener: (error: Error) => void): this;
        on(event: "exit", listener: (code: number, signal: string) => void): this;
        on(event: "listening", listener: (address: Address) => void): this;
        on(event: "message", listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined.
        on(event: "online", listener: () => void): this;
        once(event: string, listener: (...args: any[]) => void): this;
        once(event: "disconnect", listener: () => void): this;
        once(event: "error", listener: (error: Error) => void): this;
        once(event: "exit", listener: (code: number, signal: string) => void): this;
        once(event: "listening", listener: (address: Address) => void): this;
        once(event: "message", listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined.
        once(event: "online", listener: () => void): this;
        prependListener(event: string, listener: (...args: any[]) => void): this;
        prependListener(event: "disconnect", listener: () => void): this;
        prependListener(event: "error", listener: (error: Error) => void): this;
        prependListener(event: "exit", listener: (code: number, signal: string) => void): this;
        prependListener(event: "listening", listener: (address: Address) => void): this;
        prependListener(event: "message", listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined.
        prependListener(event: "online", listener: () => void): this;
        prependOnceListener(event: string, listener: (...args: any[]) => void): this;
        prependOnceListener(event: "disconnect", listener: () => void): this;
        prependOnceListener(event: "error", listener: (error: Error) => void): this;
        prependOnceListener(event: "exit", listener: (code: number, signal: string) => void): this;
        prependOnceListener(event: "listening", listener: (address: Address) => void): this;
        prependOnceListener(event: "message", listener: (message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined.
        prependOnceListener(event: "online", listener: () => void): this;
    }
    export interface Cluster extends EventEmitter {
        disconnect(callback?: () => void): void;
        /**
         * Spawn a new worker process.
         *
         * This can only be called from the primary process.
         * @param env Key/value pairs to add to worker process environment.
         * @since v0.6.0
         */
        fork(env?: any): Worker;
        /** @deprecated since v16.0.0 - use isPrimary. */
        readonly isMaster: boolean;
        /**
         * True if the process is a primary. This is determined by the `process.env.NODE_UNIQUE_ID`. If `process.env.NODE_UNIQUE_ID`
         * is undefined, then `isPrimary` is `true`.
         * @since v16.0.0
         */
        readonly isPrimary: boolean;
        /**
         * True if the process is not a primary (it is the negation of `cluster.isPrimary`).
         * @since v0.6.0
         */
        readonly isWorker: boolean;
        /**
         * The scheduling policy, either `cluster.SCHED_RR` for round-robin or `cluster.SCHED_NONE` to leave it to the operating system. This is a
         * global setting and effectively frozen once either the first worker is spawned, or [`.setupPrimary()`](https://nodejs.org/docs/latest-v16.x/api/cluster.html#clustersetupprimarysettings)
         * is called, whichever comes first.
         *
         * `SCHED_RR` is the default on all operating systems except Windows. Windows will change to `SCHED_RR` once libuv is able to effectively distribute
         * IOCP handles without incurring a large performance hit.
         *
         * `cluster.schedulingPolicy` can also be set through the `NODE_CLUSTER_SCHED_POLICY` environment variable. Valid values are `'rr'` and `'none'`.
         * @since v0.11.2
         */
        schedulingPolicy: number;
        /**
         * After calling [`.setupPrimary()`](https://nodejs.org/docs/latest-v16.x/api/cluster.html#clustersetupprimarysettings)
         * (or [`.fork()`](https://nodejs.org/docs/latest-v16.x/api/cluster.html#clusterforkenv)) this settings object will contain
         * the settings, including the default values.
         *
         * This object is not intended to be changed or set manually.
         * @since v0.7.1
         */
        readonly settings: ClusterSettings;
        /** @deprecated since v16.0.0 - use [`.setupPrimary()`](https://nodejs.org/docs/latest-v16.x/api/cluster.html#clustersetupprimarysettings) instead. */
        setupMaster(settings?: ClusterSettings): void;
        /**
         * `setupPrimary` is used to change the default 'fork' behavior. Once called, the settings will be present in `cluster.settings`.
         *
         * Any settings changes only affect future calls to [`.fork()`](https://nodejs.org/docs/latest-v16.x/api/cluster.html#clusterforkenv)
         * and have no effect on workers that are already running.
         *
         * The only attribute of a worker that cannot be set via `.setupPrimary()` is the `env` passed to
         * [`.fork()`](https://nodejs.org/docs/latest-v16.x/api/cluster.html#clusterforkenv).
         *
         * The defaults above apply to the first call only; the defaults for later calls are the current values at the time of
         * `cluster.setupPrimary()` is called.
         *
         * ```js
         * import cluster from 'node:cluster';
         *
         * cluster.setupPrimary({
         *   exec: 'worker.js',
         *   args: ['--use', 'https'],
         *   silent: true,
         * });
         * cluster.fork(); // https worker
         * cluster.setupPrimary({
         *   exec: 'worker.js',
         *   args: ['--use', 'http'],
         * });
         * cluster.fork(); // http worker
         * ```
         *
         * This can only be called from the primary process.
         * @since v16.0.0
         */
        setupPrimary(settings?: ClusterSettings): void;
        /**
         * A reference to the current worker object. Not available in the primary process.
         *
         * ```js
         * import cluster from 'node:cluster';
         *
         * if (cluster.isPrimary) {
         *   console.log('I am primary');
         *   cluster.fork();
         *   cluster.fork();
         * } else if (cluster.isWorker) {
         *   console.log(`I am worker #${cluster.worker.id}`);
         * }
         * ```
         * @since v0.7.0
         */
        readonly worker?: Worker | undefined;
        /**
         * A hash that stores the active worker objects, keyed by `id` field. This makes it easy to loop through all the workers. It is only available in the primary process.
         *
         * A worker is removed from `cluster.workers` after the worker has disconnected _and_ exited. The order between these two events cannot be determined in advance. However, it
         * is guaranteed that the removal from the `cluster.workers` list happens before the last `'disconnect'` or `'exit'` event is emitted.
         *
         * ```js
         * import cluster from 'node:cluster';
         *
         * for (const worker of Object.values(cluster.workers)) {
         *   worker.send('big announcement to all workers');
         * }
         * ```
         * @since v0.7.0
         */
        readonly workers?: NodeJS.Dict<Worker> | undefined;
        readonly SCHED_NONE: number;
        readonly SCHED_RR: number;
        /**
         * events.EventEmitter
         *   1. disconnect
         *   2. exit
         *   3. fork
         *   4. listening
         *   5. message
         *   6. online
         *   7. setup
         */
        addListener(event: string, listener: (...args: any[]) => void): this;
        addListener(event: "disconnect", listener: (worker: Worker) => void): this;
        addListener(event: "exit", listener: (worker: Worker, code: number, signal: string) => void): this;
        addListener(event: "fork", listener: (worker: Worker) => void): this;
        addListener(event: "listening", listener: (worker: Worker, address: Address) => void): this;
        addListener(
            event: "message",
            listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void,
        ): this; // the handle is a net.Socket or net.Server object, or undefined.
        addListener(event: "online", listener: (worker: Worker) => void): this;
        addListener(event: "setup", listener: (settings: ClusterSettings) => void): this;
        emit(event: string | symbol, ...args: any[]): boolean;
        emit(event: "disconnect", worker: Worker): boolean;
        emit(event: "exit", worker: Worker, code: number, signal: string): boolean;
        emit(event: "fork", worker: Worker): boolean;
        emit(event: "listening", worker: Worker, address: Address): boolean;
        emit(event: "message", worker: Worker, message: any, handle: net.Socket | net.Server): boolean;
        emit(event: "online", worker: Worker): boolean;
        emit(event: "setup", settings: ClusterSettings): boolean;
        on(event: string, listener: (...args: any[]) => void): this;
        on(event: "disconnect", listener: (worker: Worker) => void): this;
        on(event: "exit", listener: (worker: Worker, code: number, signal: string) => void): this;
        on(event: "fork", listener: (worker: Worker) => void): this;
        on(event: "listening", listener: (worker: Worker, address: Address) => void): this;
        on(event: "message", listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined.
        on(event: "online", listener: (worker: Worker) => void): this;
        on(event: "setup", listener: (settings: ClusterSettings) => void): this;
        once(event: string, listener: (...args: any[]) => void): this;
        once(event: "disconnect", listener: (worker: Worker) => void): this;
        once(event: "exit", listener: (worker: Worker, code: number, signal: string) => void): this;
        once(event: "fork", listener: (worker: Worker) => void): this;
        once(event: "listening", listener: (worker: Worker, address: Address) => void): this;
        once(event: "message", listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void): this; // the handle is a net.Socket or net.Server object, or undefined.
        once(event: "online", listener: (worker: Worker) => void): this;
        once(event: "setup", listener: (settings: ClusterSettings) => void): this;
        prependListener(event: string, listener: (...args: any[]) => void): this;
        prependListener(event: "disconnect", listener: (worker: Worker) => void): this;
        prependListener(event: "exit", listener: (worker: Worker, code: number, signal: string) => void): this;
        prependListener(event: "fork", listener: (worker: Worker) => void): this;
        prependListener(event: "listening", listener: (worker: Worker, address: Address) => void): this;
        // the handle is a net.Socket or net.Server object, or undefined.
        prependListener(
            event: "message",
            listener: (worker: Worker, message: any, handle?: net.Socket | net.Server) => void,
        ): this;
        prependListener(event: "online", listener: (worker: Worker) => void): this;
        prependListener(event: "setup", listener: (settings: ClusterSettings) => void): this;
        prependOnceListener(event: string, listener: (...args: any[]) => void): this;
        prependOnceListener(event: "disconnect", listener: (worker: Worker) => void): this;
        prependOnceListener(event: "exit", listener: (worker: Worker, code: number, signal: string) => void): this;
        prependOnceListener(event: "fork", listener: (worker: Worker) => void): this;
        prependOnceListener(event: "listening", listener: (worker: Worker, address: Address) => void): this;
        // the handle is a net.Socket or net.Server object, or undefined.
        prependOnceListener(
            event: "message",
            listener: (worker: Worker, message: any, handle: net.Socket | net.Server) => void,
        ): this;
        prependOnceListener(event: "online", listener: (worker: Worker) => void): this;
        prependOnceListener(event: "setup", listener: (settings: ClusterSettings) => void): this;
    }
    const cluster: Cluster;
    export default cluster;
}
declare module "node:cluster" {
    export * from "cluster";
    export { default as default } from "cluster";
}

${this.title}

Code Editor : cluster.d.ts