@types/node/child_process.d.ts

/**
 * The `child_process` module provides the ability to spawn subprocesses in
 * a manner that is similar, but not identical, to [`popen(3)`](http://man7.org/linux/man-pages/man3/popen.3.html). This capability
 * is primarily provided by the {@link spawn} function:
 *
 * ```js
 * const { spawn } = require('child_process');
 * const ls = spawn('ls', ['-lh', '/usr']);
 *
 * ls.stdout.on('data', (data) => {
 *   console.log(`stdout: ${data}`);
 * });
 *
 * ls.stderr.on('data', (data) => {
 *   console.error(`stderr: ${data}`);
 * });
 *
 * ls.on('close', (code) => {
 *   console.log(`child process exited with code ${code}`);
 * });
 * ```
 *
 * By default, pipes for `stdin`, `stdout`, and `stderr` are established between
 * the parent Node.js process and the spawned subprocess. These pipes have
 * limited (and platform-specific) capacity. If the subprocess writes to
 * stdout in excess of that limit without the output being captured, the
 * subprocess blocks waiting for the pipe buffer to accept more data. This is
 * identical to the behavior of pipes in the shell. Use the `{ stdio: 'ignore' }`option if the output will not be consumed.
 *
 * The command lookup is performed using the `options.env.PATH` environment
 * variable if it is in the `options` object. Otherwise, `process.env.PATH` is
 * used.
 *
 * On Windows, environment variables are case-insensitive. Node.js
 * lexicographically sorts the `env` keys and uses the first one that
 * case-insensitively matches. Only first (in lexicographic order) entry will be
 * passed to the subprocess. This might lead to issues on Windows when passing
 * objects to the `env` option that have multiple variants of the same key, such as`PATH` and `Path`.
 *
 * The {@link spawn} method spawns the child process asynchronously,
 * without blocking the Node.js event loop. The {@link spawnSync} function provides equivalent functionality in a synchronous manner that blocks
 * the event loop until the spawned process either exits or is terminated.
 *
 * For convenience, the `child_process` module provides a handful of synchronous
 * and asynchronous alternatives to {@link spawn} and {@link spawnSync}. Each of these alternatives are implemented on
 * top of {@link spawn} or {@link spawnSync}.
 *
 * * {@link exec}: spawns a shell and runs a command within that
 * shell, passing the `stdout` and `stderr` to a callback function when
 * complete.
 * * {@link execFile}: similar to {@link exec} except
 * that it spawns the command directly without first spawning a shell by
 * default.
 * * {@link fork}: spawns a new Node.js process and invokes a
 * specified module with an IPC communication channel established that allows
 * sending messages between parent and child.
 * * {@link execSync}: a synchronous version of {@link exec} that will block the Node.js event loop.
 * * {@link execFileSync}: a synchronous version of {@link execFile} that will block the Node.js event loop.
 *
 * For certain use cases, such as automating shell scripts, the `synchronous counterparts` may be more convenient. In many cases, however,
 * the synchronous methods can have significant impact on performance due to
 * stalling the event loop while spawned processes complete.
 * @see [source](https://github.com/nodejs/node/blob/v17.0.0/lib/child_process.js)
 */
declare module 'child_process' {
    import { ObjectEncodingOptions } from 'node:fs';
    import { EventEmitter, Abortable } from 'node:events';
    import * as net from 'node:net';
    import { Writable, Readable, Stream, Pipe } from 'node:stream';
    import { URL } from 'node:url';
    type Serializable = string | object | number | boolean | bigint;
    type SendHandle = net.Socket | net.Server;
    /**
     * Instances of the `ChildProcess` represent spawned child processes.
     *
     * Instances of `ChildProcess` are not intended to be created directly. Rather,
     * use the {@link spawn}, {@link exec},{@link execFile}, or {@link fork} methods to create
     * instances of `ChildProcess`.
     * @since v2.2.0
     */
    class ChildProcess extends EventEmitter {
        /**
         * A `Writable Stream` that represents the child process's `stdin`.
         *
         * If a child process waits to read all of its input, the child will not continue
         * until this stream has been closed via `end()`.
         *
         * If the child was spawned with `stdio[0]` set to anything other than `'pipe'`,
         * then this will be `null`.
         *
         * `subprocess.stdin` is an alias for `subprocess.stdio[0]`. Both properties will
         * refer to the same value.
         *
         * The `subprocess.stdin` property can be `undefined` if the child process could
         * not be successfully spawned.
         * @since v0.1.90
         */
        stdin: Writable | null;
        /**
         * A `Readable Stream` that represents the child process's `stdout`.
         *
         * If the child was spawned with `stdio[1]` set to anything other than `'pipe'`,
         * then this will be `null`.
         *
         * `subprocess.stdout` is an alias for `subprocess.stdio[1]`. Both properties will
         * refer to the same value.
         *
         * ```js
         * const { spawn } = require('child_process');
         *
         * const subprocess = spawn('ls');
         *
         * subprocess.stdout.on('data', (data) => {
         *   console.log(`Received chunk ${data}`);
         * });
         * ```
         *
         * The `subprocess.stdout` property can be `null` if the child process could
         * not be successfully spawned.
         * @since v0.1.90
         */
        stdout: Readable | null;
        /**
         * A `Readable Stream` that represents the child process's `stderr`.
         *
         * If the child was spawned with `stdio[2]` set to anything other than `'pipe'`,
         * then this will be `null`.
         *
         * `subprocess.stderr` is an alias for `subprocess.stdio[2]`. Both properties will
         * refer to the same value.
         *
         * The `subprocess.stderr` property can be `null` if the child process could
         * not be successfully spawned.
         * @since v0.1.90
         */
        stderr: Readable | null;
        /**
         * The `subprocess.channel` property is a reference to the child's IPC channel. If
         * no IPC channel currently exists, this property is `undefined`.
         * @since v7.1.0
         */
        readonly channel?: Pipe | null | undefined;
        /**
         * A sparse array of pipes to the child process, corresponding with positions in
         * the `stdio` option passed to {@link spawn} that have been set
         * to the value `'pipe'`. `subprocess.stdio[0]`, `subprocess.stdio[1]`, and`subprocess.stdio[2]` are also available as `subprocess.stdin`,`subprocess.stdout`, and `subprocess.stderr`,
         * respectively.
         *
         * In the following example, only the child's fd `1` (stdout) is configured as a
         * pipe, so only the parent's `subprocess.stdio[1]` is a stream, all other values
         * in the array are `null`.
         *
         * ```js
         * const assert = require('assert');
         * const fs = require('fs');
         * const child_process = require('child_process');
         *
         * const subprocess = child_process.spawn('ls', {
         *   stdio: [
         *     0, // Use parent's stdin for child.
         *     'pipe', // Pipe child's stdout to parent.
         *     fs.openSync('err.out', 'w'), // Direct child's stderr to a file.
         *   ]
         * });
         *
         * assert.strictEqual(subprocess.stdio[0], null);
         * assert.strictEqual(subprocess.stdio[0], subprocess.stdin);
         *
         * assert(subprocess.stdout);
         * assert.strictEqual(subprocess.stdio[1], subprocess.stdout);
         *
         * assert.strictEqual(subprocess.stdio[2], null);
         * assert.strictEqual(subprocess.stdio[2], subprocess.stderr);
         * ```
         *
         * The `subprocess.stdio` property can be `undefined` if the child process could
         * not be successfully spawned.
         * @since v0.7.10
         */
        readonly stdio: [
            Writable | null,
            // stdin
            Readable | null,
            // stdout
            Readable | null,
            // stderr
            Readable | Writable | null | undefined,
            // extra
            Readable | Writable | null | undefined // extra
        ];
        /**
         * The `subprocess.killed` property indicates whether the child process
         * successfully received a signal from `subprocess.kill()`. The `killed` property
         * does not indicate that the child process has been terminated.
         * @since v0.5.10
         */
        readonly killed: boolean;
        /**
         * Returns the process identifier (PID) of the child process. If the child process
         * fails to spawn due to errors, then the value is `undefined` and `error` is
         * emitted.
         *
         * ```js
         * const { spawn } = require('child_process');
         * const grep = spawn('grep', ['ssh']);
         *
         * console.log(`Spawned child pid: ${grep.pid}`);
         * grep.stdin.end();
         * ```
         * @since v0.1.90
         */
        readonly pid?: number | undefined;
        /**
         * The `subprocess.connected` property indicates whether it is still possible to
         * send and receive messages from a child process. When `subprocess.connected` is`false`, it is no longer possible to send or receive messages.
         * @since v0.7.2
         */
        readonly connected: boolean;
        /**
         * The `subprocess.exitCode` property indicates the exit code of the child process.
         * If the child process is still running, the field will be `null`.
         */
        readonly exitCode: number | null;
        /**
         * The `subprocess.signalCode` property indicates the signal received by
         * the child process if any, else `null`.
         */
        readonly signalCode: NodeJS.Signals | null;
        /**
         * The `subprocess.spawnargs` property represents the full list of command-line
         * arguments the child process was launched with.
         */
        readonly spawnargs: string[];
        /**
         * The `subprocess.spawnfile` property indicates the executable file name of
         * the child process that is launched.
         *
         * For {@link fork}, its value will be equal to `process.execPath`.
         * For {@link spawn}, its value will be the name of
         * the executable file.
         * For {@link exec},  its value will be the name of the shell
         * in which the child process is launched.
         */
        readonly spawnfile: string;
        /**
         * The `subprocess.kill()` method sends a signal to the child process. If no
         * argument is given, the process will be sent the `'SIGTERM'` signal. See [`signal(7)`](http://man7.org/linux/man-pages/man7/signal.7.html) for a list of available signals. This function
         * returns `true` if [`kill(2)`](http://man7.org/linux/man-pages/man2/kill.2.html) succeeds, and `false` otherwise.
         *
         * ```js
         * const { spawn } = require('child_process');
         * const grep = spawn('grep', ['ssh']);
         *
         * grep.on('close', (code, signal) => {
         *   console.log(
         *     `child process terminated due to receipt of signal ${signal}`);
         * });
         *
         * // Send SIGHUP to process.
         * grep.kill('SIGHUP');
         * ```
         *
         * The `ChildProcess` object may emit an `'error'` event if the signal
         * cannot be delivered. Sending a signal to a child process that has already exited
         * is not an error but may have unforeseen consequences. Specifically, if the
         * process identifier (PID) has been reassigned to another process, the signal will
         * be delivered to that process instead which can have unexpected results.
         *
         * While the function is called `kill`, the signal delivered to the child process
         * may not actually terminate the process.
         *
         * See [`kill(2)`](http://man7.org/linux/man-pages/man2/kill.2.html) for reference.
         *
         * On Windows, where POSIX signals do not exist, the `signal` argument will be
         * ignored, and the process will be killed forcefully and abruptly (similar to`'SIGKILL'`).
         * See `Signal Events` for more details.
         *
         * On Linux, child processes of child processes will not be terminated
         * when attempting to kill their parent. This is likely to happen when running a
         * new process in a shell or with the use of the `shell` option of `ChildProcess`:
         *
         * ```js
         * 'use strict';
         * const { spawn } = require('child_process');
         *
         * const subprocess = spawn(
         *   'sh',
         *   [
         *     '-c',
         *     `node -e "setInterval(() => {
         *       console.log(process.pid, 'is alive')
         *     }, 500);"`,
         *   ], {
         *     stdio: ['inherit', 'inherit', 'inherit']
         *   }
         * );
         *
         * setTimeout(() => {
         *   subprocess.kill(); // Does not terminate the Node.js process in the shell.
         * }, 2000);
         * ```
         * @since v0.1.90
         */
        kill(signal?: NodeJS.Signals | number): boolean;
        /**
         * When an IPC channel has been established between the parent and child (
         * i.e. when using {@link fork}), the `subprocess.send()` method can
         * be used to send messages to the child process. When the child process is a
         * Node.js instance, these messages can be received via the `'message'` event.
         *
         * The message goes through serialization and parsing. The resulting
         * message might not be the same as what is originally sent.
         *
         * For example, in the parent script:
         *
         * ```js
         * const cp = require('child_process');
         * const n = cp.fork(`${__dirname}/sub.js`);
         *
         * n.on('message', (m) => {
         *   console.log('PARENT got message:', m);
         * });
         *
         * // Causes the child to print: CHILD got message: { hello: 'world' }
         * n.send({ hello: 'world' });
         * ```
         *
         * And then the child script, `'sub.js'` might look like this:
         *
         * ```js
         * process.on('message', (m) => {
         *   console.log('CHILD got message:', m);
         * });
         *
         * // Causes the parent to print: PARENT got message: { foo: 'bar', baz: null }
         * process.send({ foo: 'bar', baz: NaN });
         * ```
         *
         * Child Node.js processes will have a `process.send()` method of their own
         * that allows the child to send messages back to the parent.
         *
         * There is a special case when sending a `{cmd: 'NODE_foo'}` message. Messages
         * containing a `NODE_` prefix in the `cmd` property are reserved for use within
         * Node.js core and will not be emitted in the child's `'message'` event. Rather, such messages are emitted using the`'internalMessage'` event and are consumed internally by Node.js.
         * Applications should avoid using such messages or listening for`'internalMessage'` events as it is subject to change without notice.
         *
         * The optional `sendHandle` argument that may be passed to `subprocess.send()` is
         * for passing a TCP server or socket object to the child process. The child will
         * receive the object as the second argument passed to the callback function
         * registered on the `'message'` event. Any data that is received
         * and buffered in the socket will not be sent to the child.
         *
         * The optional `callback` is a function that is invoked after the message is
         * sent but before the child may have received it. The function is called with a
         * single argument: `null` on success, or an `Error` object on failure.
         *
         * If no `callback` function is provided and the message cannot be sent, an`'error'` event will be emitted by the `ChildProcess` object. This can
         * happen, for instance, when the child process has already exited.
         *
         * `subprocess.send()` will return `false` if the channel has closed or when the
         * backlog of unsent messages exceeds a threshold that makes it unwise to send
         * more. Otherwise, the method returns `true`. The `callback` function can be
         * used to implement flow control.
         *
         * #### Example: sending a server object
         *
         * The `sendHandle` argument can be used, for instance, to pass the handle of
         * a TCP server object to the child process as illustrated in the example below:
         *
         * ```js
         * const subprocess = require('child_process').fork('subprocess.js');
         *
         * // Open up the server object and send the handle.
         * const server = require('net').createServer();
         * server.on('connection', (socket) => {
         *   socket.end('handled by parent');
         * });
         * server.listen(1337, () => {
         *   subprocess.send('server', server);
         * });
         * ```
         *
         * The child would then receive the server object as:
         *
         * ```js
         * process.on('message', (m, server) => {
         *   if (m === 'server') {
         *     server.on('connection', (socket) => {
         *       socket.end('handled by child');
         *     });
         *   }
         * });
         * ```
         *
         * Once the server is now shared between the parent and child, some connections
         * can be handled by the parent and some by the child.
         *
         * While the example above uses a server created using the `net` module, `dgram`module servers use exactly the same workflow with the exceptions of listening on
         * a `'message'` event instead of `'connection'` and using `server.bind()` instead
         * of `server.listen()`. This is, however, currently only supported on Unix
         * platforms.
         *
         * #### Example: sending a socket object
         *
         * Similarly, the `sendHandler` argument can be used to pass the handle of a
         * socket to the child process. The example below spawns two children that each
         * handle connections with "normal" or "special" priority:
         *
         * ```js
         * const { fork } = require('child_process');
         * const normal = fork('subprocess.js', ['normal']);
         * const special = fork('subprocess.js', ['special']);
         *
         * // Open up the server and send sockets to child. Use pauseOnConnect to prevent
         * // the sockets from being read before they are sent to the child process.
         * const server = require('net').createServer({ pauseOnConnect: true });
         * server.on('connection', (socket) => {
         *
         *   // If this is special priority...
         *   if (socket.remoteAddress === '74.125.127.100') {
         *     special.send('socket', socket);
         *     return;
         *   }
         *   // This is normal priority.
         *   normal.send('socket', socket);
         * });
         * server.listen(1337);
         * ```
         *
         * The `subprocess.js` would receive the socket handle as the second argument
         * passed to the event callback function:
         *
         * ```js
         * process.on('message', (m, socket) => {
         *   if (m === 'socket') {
         *     if (socket) {
         *       // Check that the client socket exists.
         *       // It is possible for the socket to be closed between the time it is
         *       // sent and the time it is received in the child process.
         *       socket.end(`Request handled with ${process.argv[2]} priority`);
         *     }
         *   }
         * });
         * ```
         *
         * Do not use `.maxConnections` on a socket that has been passed to a subprocess.
         * The parent cannot track when the socket is destroyed.
         *
         * Any `'message'` handlers in the subprocess should verify that `socket` exists,
         * as the connection may have been closed during the time it takes to send the
         * connection to the child.
         * @since v0.5.9
         * @param options The `options` argument, if present, is an object used to parameterize the sending of certain types of handles. `options` supports the following properties:
         */
        send(message: Serializable, callback?: (error: Error | null) => void): boolean;
        send(message: Serializable, sendHandle?: SendHandle, callback?: (error: Error | null) => void): boolean;
        send(message: Serializable, sendHandle?: SendHandle, options?: MessageOptions, callback?: (error: Error | null) => void): boolean;
        /**
         * Closes the IPC channel between parent and child, allowing the child to exit
         * gracefully once there are no other connections keeping it alive. After calling
         * this method the `subprocess.connected` and `process.connected` properties in
         * both the parent and child (respectively) will be set to `false`, and it will be
         * no longer possible to pass messages between the processes.
         *
         * The `'disconnect'` event will be emitted when there are no messages in the
         * process of being received. This will most often be triggered immediately after
         * calling `subprocess.disconnect()`.
         *
         * When the child process is a Node.js instance (e.g. spawned using {@link fork}), the `process.disconnect()` method can be invoked
         * within the child process to close the IPC channel as well.
         * @since v0.7.2
         */
        disconnect(): void;
        /**
         * By default, the parent will wait for the detached child to exit. To prevent the
         * parent from waiting for a given `subprocess` to exit, use the`subprocess.unref()` method. Doing so will cause the parent's event loop to not
         * include the child in its reference count, allowing the parent to exit
         * independently of the child, unless there is an established IPC channel between
         * the child and the parent.
         *
         * ```js
         * const { spawn } = require('child_process');
         *
         * const subprocess = spawn(process.argv[0], ['child_program.js'], {
         *   detached: true,
         *   stdio: 'ignore'
         * });
         *
         * subprocess.unref();
         * ```
         * @since v0.7.10
         */
        unref(): void;
        /**
         * Calling `subprocess.ref()` after making a call to `subprocess.unref()` will
         * restore the removed reference count for the child process, forcing the parent
         * to wait for the child to exit before exiting itself.
         *
         * ```js
         * const { spawn } = require('child_process');
         *
         * const subprocess = spawn(process.argv[0], ['child_program.js'], {
         *   detached: true,
         *   stdio: 'ignore'
         * });
         *
         * subprocess.unref();
         * subprocess.ref();
         * ```
         * @since v0.7.10
         */
        ref(): void;
        /**
         * events.EventEmitter
         * 1. close
         * 2. disconnect
         * 3. error
         * 4. exit
         * 5. message
         * 6. spawn
         */
        addListener(event: string, listener: (...args: any[]) => void): this;
        addListener(event: 'close', listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
        addListener(event: 'disconnect', listener: () => void): this;
        addListener(event: 'error', listener: (err: Error) => void): this;
        addListener(event: 'exit', listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
        addListener(event: 'message', listener: (message: Serializable, sendHandle: SendHandle) => void): this;
        addListener(event: 'spawn', listener: () => void): this;
        emit(event: string | symbol, ...args: any[]): boolean;
        emit(event: 'close', code: number | null, signal: NodeJS.Signals | null): boolean;
        emit(event: 'disconnect'): boolean;
        emit(event: 'error', err: Error): boolean;
        emit(event: 'exit', code: number | null, signal: NodeJS.Signals | null): boolean;
        emit(event: 'message', message: Serializable, sendHandle: SendHandle): boolean;
        emit(event: 'spawn', listener: () => void): boolean;
        on(event: string, listener: (...args: any[]) => void): this;
        on(event: 'close', listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
        on(event: 'disconnect', listener: () => void): this;
        on(event: 'error', listener: (err: Error) => void): this;
        on(event: 'exit', listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
        on(event: 'message', listener: (message: Serializable, sendHandle: SendHandle) => void): this;
        on(event: 'spawn', listener: () => void): this;
        once(event: string, listener: (...args: any[]) => void): this;
        once(event: 'close', listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
        once(event: 'disconnect', listener: () => void): this;
        once(event: 'error', listener: (err: Error) => void): this;
        once(event: 'exit', listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
        once(event: 'message', listener: (message: Serializable, sendHandle: SendHandle) => void): this;
        once(event: 'spawn', listener: () => void): this;
        prependListener(event: string, listener: (...args: any[]) => void): this;
        prependListener(event: 'close', listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
        prependListener(event: 'disconnect', listener: () => void): this;
        prependListener(event: 'error', listener: (err: Error) => void): this;
        prependListener(event: 'exit', listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
        prependListener(event: 'message', listener: (message: Serializable, sendHandle: SendHandle) => void): this;
        prependListener(event: 'spawn', listener: () => void): this;
        prependOnceListener(event: string, listener: (...args: any[]) => void): this;
        prependOnceListener(event: 'close', listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
        prependOnceListener(event: 'disconnect', listener: () => void): this;
        prependOnceListener(event: 'error', listener: (err: Error) => void): this;
        prependOnceListener(event: 'exit', listener: (code: number | null, signal: NodeJS.Signals | null) => void): this;
        prependOnceListener(event: 'message', listener: (message: Serializable, sendHandle: SendHandle) => void): this;
        prependOnceListener(event: 'spawn', listener: () => void): this;
    }
    // return this object when stdio option is undefined or not specified
    interface ChildProcessWithoutNullStreams extends ChildProcess {
        stdin: Writable;
        stdout: Readable;
        stderr: Readable;
        readonly stdio: [
            Writable,
            Readable,
            Readable,
            // stderr
            Readable | Writable | null | undefined,
            // extra, no modification
            Readable | Writable | null | undefined // extra, no modification
        ];
    }
    // return this object when stdio option is a tuple of 3
    interface ChildProcessByStdio<I extends null | Writable, O extends null | Readable, E extends null | Readable> extends ChildProcess {
        stdin: I;
        stdout: O;
        stderr: E;
        readonly stdio: [
            I,
            O,
            E,
            Readable | Writable | null | undefined,
            // extra, no modification
            Readable | Writable | null | undefined // extra, no modification
        ];
    }
    interface MessageOptions {
        keepOpen?: boolean | undefined;
    }
    type IOType = 'overlapped' | 'pipe' | 'ignore' | 'inherit';
    type StdioOptions = IOType | Array<IOType | 'ipc' | Stream | number | null | undefined>;
    type SerializationType = 'json' | 'advanced';
    interface MessagingOptions extends Abortable {
        /**
         * Specify the kind of serialization used for sending messages between processes.
         * @default 'json'
         */
        serialization?: SerializationType | undefined;
        /**
         * The signal value to be used when the spawned process will be killed by the abort signal.
         * @default 'SIGTERM'
         */
        killSignal?: NodeJS.Signals | number | undefined;
        /**
         * In milliseconds the maximum amount of time the process is allowed to run.
         */
        timeout?: number | undefined;
    }
    interface ProcessEnvOptions {
        uid?: number | undefined;
        gid?: number | undefined;
        cwd?: string | URL | undefined;
        env?: NodeJS.ProcessEnv | undefined;
    }
    interface CommonOptions extends ProcessEnvOptions {
        /**
         * @default true
         */
        windowsHide?: boolean | undefined;
        /**
         * @default 0
         */
        timeout?: number | undefined;
    }
    interface CommonSpawnOptions extends CommonOptions, MessagingOptions, Abortable {
        argv0?: string | undefined;
        stdio?: StdioOptions | undefined;
        shell?: boolean | string | undefined;
        windowsVerbatimArguments?: boolean | undefined;
    }
    interface SpawnOptions extends CommonSpawnOptions {
        detached?: boolean | undefined;
    }
    interface SpawnOptionsWithoutStdio extends SpawnOptions {
        stdio?: StdioPipeNamed | StdioPipe[] | undefined;
    }
    type StdioNull = 'inherit' | 'ignore' | Stream;
    type StdioPipeNamed = 'pipe' | 'overlapped';
    type StdioPipe = undefined | null | StdioPipeNamed;
    interface SpawnOptionsWithStdioTuple<Stdin extends StdioNull | StdioPipe, Stdout extends StdioNull | StdioPipe, Stderr extends StdioNull | StdioPipe> extends SpawnOptions {
        stdio: [Stdin, Stdout, Stderr];
    }
    /**
     * The `child_process.spawn()` method spawns a new process using the given`command`, with command-line arguments in `args`. If omitted, `args` defaults
     * to an empty array.
     *
     * **If the `shell` option is enabled, do not pass unsanitized user input to this**
     * **function. Any input containing shell metacharacters may be used to trigger**
     * **arbitrary command execution.**
     *
     * A third argument may be used to specify additional options, with these defaults:
     *
     * ```js
     * const defaults = {
     *   cwd: undefined,
     *   env: process.env
     * };
     * ```
     *
     * Use `cwd` to specify the working directory from which the process is spawned.
     * If not given, the default is to inherit the current working directory. If given,
     * but the path does not exist, the child process emits an `ENOENT` error
     * and exits immediately. `ENOENT` is also emitted when the command
     * does not exist.
     *
     * Use `env` to specify environment variables that will be visible to the new
     * process, the default is `process.env`.
     *
     * `undefined` values in `env` will be ignored.
     *
     * Example of running `ls -lh /usr`, capturing `stdout`, `stderr`, and the
     * exit code:
     *
     * ```js
     * const { spawn } = require('child_process');
     * const ls = spawn('ls', ['-lh', '/usr']);
     *
     * ls.stdout.on('data', (data) => {
     *   console.log(`stdout: ${data}`);
     * });
     *
     * ls.stderr.on('data', (data) => {
     *   console.error(`stderr: ${data}`);
     * });
     *
     * ls.on('close', (code) => {
     *   console.log(`child process exited with code ${code}`);
     * });
     * ```
     *
     * Example: A very elaborate way to run `ps ax | grep ssh`
     *
     * ```js
     * const { spawn } = require('child_process');
     * const ps = spawn('ps', ['ax']);
     * const grep = spawn('grep', ['ssh']);
     *
     * ps.stdout.on('data', (data) => {
     *   grep.stdin.write(data);
     * });
     *
     * ps.stderr.on('data', (data) => {
     *   console.error(`ps stderr: ${data}`);
     * });
     *
     * ps.on('close', (code) => {
     *   if (code !== 0) {
     *     console.log(`ps process exited with code ${code}`);
     *   }
     *   grep.stdin.end();
     * });
     *
     * grep.stdout.on('data', (data) => {
     *   console.log(data.toString());
     * });
     *
     * grep.stderr.on('data', (data) => {
     *   console.error(`grep stderr: ${data}`);
     * });
     *
     * grep.on('close', (code) => {
     *   if (code !== 0) {
     *     console.log(`grep process exited with code ${code}`);
     *   }
     * });
     * ```
     *
     * Example of checking for failed `spawn`:
     *
     * ```js
     * const { spawn } = require('child_process');
     * const subprocess = spawn('bad_command');
     *
     * subprocess.on('error', (err) => {
     *   console.error('Failed to start subprocess.');
     * });
     * ```
     *
     * Certain platforms (macOS, Linux) will use the value of `argv[0]` for the process
     * title while others (Windows, SunOS) will use `command`.
     *
     * Node.js currently overwrites `argv[0]` with `process.execPath` on startup, so`process.argv[0]` in a Node.js child process will not match the `argv0`parameter passed to `spawn` from the parent,
     * retrieve it with the`process.argv0` property instead.
     *
     * If the `signal` option is enabled, calling `.abort()` on the corresponding`AbortController` is similar to calling `.kill()` on the child process except
     * the error passed to the callback will be an `AbortError`:
     *
     * ```js
     * const { spawn } = require('child_process');
     * const controller = new AbortController();
     * const { signal } = controller;
     * const grep = spawn('grep', ['ssh'], { signal });
     * grep.on('error', (err) => {
     *   // This will be called with err being an AbortError if the controller aborts
     * });
     * controller.abort(); // Stops the child process
     * ```
     * @since v0.1.90
     * @param command The command to run.
     * @param args List of string arguments.
     */
    function spawn(command: string, options?: SpawnOptionsWithoutStdio): ChildProcessWithoutNullStreams;
    function spawn(command: string, options: SpawnOptionsWithStdioTuple<StdioPipe, StdioPipe, StdioPipe>): ChildProcessByStdio<Writable, Readable, Readable>;
    function spawn(command: string, options: SpawnOptionsWithStdioTuple<StdioPipe, StdioPipe, StdioNull>): ChildProcessByStdio<Writable, Readable, null>;
    function spawn(command: string, options: SpawnOptionsWithStdioTuple<StdioPipe, StdioNull, StdioPipe>): ChildProcessByStdio<Writable, null, Readable>;
    function spawn(command: string, options: SpawnOptionsWithStdioTuple<StdioNull, StdioPipe, StdioPipe>): ChildProcessByStdio<null, Readable, Readable>;
    function spawn(command: string, options: SpawnOptionsWithStdioTuple<StdioPipe, StdioNull, StdioNull>): ChildProcessByStdio<Writable, null, null>;
    function spawn(command: string, options: SpawnOptionsWithStdioTuple<StdioNull, StdioPipe, StdioNull>): ChildProcessByStdio<null, Readable, null>;
    function spawn(command: string, options: SpawnOptionsWithStdioTuple<StdioNull, StdioNull, StdioPipe>): ChildProcessByStdio<null, null, Readable>;
    function spawn(command: string, options: SpawnOptionsWithStdioTuple<StdioNull, StdioNull, StdioNull>): ChildProcessByStdio<null, null, null>;
    function spawn(command: string, options: SpawnOptions): ChildProcess;
    // overloads of spawn with 'args'
    function spawn(command: string, args?: ReadonlyArray<string>, options?: SpawnOptionsWithoutStdio): ChildProcessWithoutNullStreams;
    function spawn(command: string, args: ReadonlyArray<string>, options: SpawnOptionsWithStdioTuple<StdioPipe, StdioPipe, StdioPipe>): ChildProcessByStdio<Writable, Readable, Readable>;
    function spawn(command: string, args: ReadonlyArray<string>, options: SpawnOptionsWithStdioTuple<StdioPipe, StdioPipe, StdioNull>): ChildProcessByStdio<Writable, Readable, null>;
    function spawn(command: string, args: ReadonlyArray<string>, options: SpawnOptionsWithStdioTuple<StdioPipe, StdioNull, StdioPipe>): ChildProcessByStdio<Writable, null, Readable>;
    function spawn(command: string, args: ReadonlyArray<string>, options: SpawnOptionsWithStdioTuple<StdioNull, StdioPipe, StdioPipe>): ChildProcessByStdio<null, Readable, Readable>;
    function spawn(command: string, args: ReadonlyArray<string>, options: SpawnOptionsWithStdioTuple<StdioPipe, StdioNull, StdioNull>): ChildProcessByStdio<Writable, null, null>;
    function spawn(command: string, args: ReadonlyArray<string>, options: SpawnOptionsWithStdioTuple<StdioNull, StdioPipe, StdioNull>): ChildProcessByStdio<null, Readable, null>;
    function spawn(command: string, args: ReadonlyArray<string>, options: SpawnOptionsWithStdioTuple<StdioNull, StdioNull, StdioPipe>): ChildProcessByStdio<null, null, Readable>;
    function spawn(command: string, args: ReadonlyArray<string>, options: SpawnOptionsWithStdioTuple<StdioNull, StdioNull, StdioNull>): ChildProcessByStdio<null, null, null>;
    function spawn(command: string, args: ReadonlyArray<string>, options: SpawnOptions): ChildProcess;
    interface ExecOptions extends CommonOptions {
        shell?: string | undefined;
        signal?: AbortSignal | undefined;
        maxBuffer?: number | undefined;
        killSignal?: NodeJS.Signals | number | undefined;
    }
    interface ExecOptionsWithStringEncoding extends ExecOptions {
        encoding: BufferEncoding;
    }
    interface ExecOptionsWithBufferEncoding extends ExecOptions {
        encoding: BufferEncoding | null; // specify `null`.
    }
    interface ExecException extends Error {
        cmd?: string | undefined;
        killed?: boolean | undefined;
        code?: number | undefined;
        signal?: NodeJS.Signals | undefined;
    }
    /**
     * Spawns a shell then executes the `command` within that shell, buffering any
     * generated output. The `command` string passed to the exec function is processed
     * directly by the shell and special characters (vary based on [shell](https://en.wikipedia.org/wiki/List_of_command-line_interpreters))
     * need to be dealt with accordingly:
     *
     * ```js
     * const { exec } = require('child_process');
     *
     * exec('"/path/to/test file/test.sh" arg1 arg2');
     * // Double quotes are used so that the space in the path is not interpreted as
     * // a delimiter of multiple arguments.
     *
     * exec('echo "The \\$HOME variable is $HOME"');
     * // The $HOME variable is escaped in the first instance, but not in the second.
     * ```
     *
     * **Never pass unsanitized user input to this function. Any input containing shell**
     * **metacharacters may be used to trigger arbitrary command execution.**
     *
     * If a `callback` function is provided, it is called with the arguments`(error, stdout, stderr)`. On success, `error` will be `null`. On error,`error` will be an instance of `Error`. The
     * `error.code` property will be
     * the exit code of the process. By convention, any exit code other than `0`indicates an error. `error.signal` will be the signal that terminated the
     * process.
     *
     * The `stdout` and `stderr` arguments passed to the callback will contain the
     * stdout and stderr output of the child process. By default, Node.js will decode
     * the output as UTF-8 and pass strings to the callback. The `encoding` option
     * can be used to specify the character encoding used to decode the stdout and
     * stderr output. If `encoding` is `'buffer'`, or an unrecognized character
     * encoding, `Buffer` objects will be passed to the callback instead.
     *
     * ```js
     * const { exec } = require('child_process');
     * exec('cat *.js missing_file | wc -l', (error, stdout, stderr) => {
     *   if (error) {
     *     console.error(`exec error: ${error}`);
     *     return;
     *   }
     *   console.log(`stdout: ${stdout}`);
     *   console.error(`stderr: ${stderr}`);
     * });
     * ```
     *
     * If `timeout` is greater than `0`, the parent will send the signal
     * identified by the `killSignal` property (the default is `'SIGTERM'`) if the
     * child runs longer than `timeout` milliseconds.
     *
     * Unlike the [`exec(3)`](http://man7.org/linux/man-pages/man3/exec.3.html) POSIX system call, `child_process.exec()` does not replace
     * the existing process and uses a shell to execute the command.
     *
     * If this method is invoked as its `util.promisify()` ed version, it returns
     * a `Promise` for an `Object` with `stdout` and `stderr` properties. The returned`ChildProcess` instance is attached to the `Promise` as a `child` property. In
     * case of an error (including any error resulting in an exit code other than 0), a
     * rejected promise is returned, with the same `error` object given in the
     * callback, but with two additional properties `stdout` and `stderr`.
     *
     * ```js
     * const util = require('util');
     * const exec = util.promisify(require('child_process').exec);
     *
     * async function lsExample() {
     *   const { stdout, stderr } = await exec('ls');
     *   console.log('stdout:', stdout);
     *   console.error('stderr:', stderr);
     * }
     * lsExample();
     * ```
     *
     * If the `signal` option is enabled, calling `.abort()` on the corresponding`AbortController` is similar to calling `.kill()` on the child process except
     * the error passed to the callback will be an `AbortError`:
     *
     * ```js
     * const { exec } = require('child_process');
     * const controller = new AbortController();
     * const { signal } = controller;
     * const child = exec('grep ssh', { signal }, (error) => {
     *   console.log(error); // an AbortError
     * });
     * controller.abort();
     * ```
     * @since v0.1.90
     * @param command The command to run, with space-separated arguments.
     * @param callback called with the output when process terminates.
     */
    function exec(command: string, callback?: (error: ExecException | null, stdout: string, stderr: string) => void): ChildProcess;
    // `options` with `"buffer"` or `null` for `encoding` means stdout/stderr are definitely `Buffer`.
    function exec(
        command: string,
        options: {
            encoding: 'buffer' | null;
        } & ExecOptions,
        callback?: (error: ExecException | null, stdout: Buffer, stderr: Buffer) => void
    ): ChildProcess;
    // `options` with well known `encoding` means stdout/stderr are definitely `string`.
    function exec(
        command: string,
        options: {
            encoding: BufferEncoding;
        } & ExecOptions,
        callback?: (error: ExecException | null, stdout: string, stderr: string) => void
    ): ChildProcess;
    // `options` with an `encoding` whose type is `string` means stdout/stderr could either be `Buffer` or `string`.
    // There is no guarantee the `encoding` is unknown as `string` is a superset of `BufferEncoding`.
    function exec(
        command: string,
        options: {
            encoding: BufferEncoding;
        } & ExecOptions,
        callback?: (error: ExecException | null, stdout: string | Buffer, stderr: string | Buffer) => void
    ): ChildProcess;
    // `options` without an `encoding` means stdout/stderr are definitely `string`.
    function exec(command: string, options: ExecOptions, callback?: (error: ExecException | null, stdout: string, stderr: string) => void): ChildProcess;
    // fallback if nothing else matches. Worst case is always `string | Buffer`.
    function exec(
        command: string,
        options: (ObjectEncodingOptions & ExecOptions) | undefined | null,
        callback?: (error: ExecException | null, stdout: string | Buffer, stderr: string | Buffer) => void
    ): ChildProcess;
    interface PromiseWithChild<T> extends Promise<T> {
        child: ChildProcess;
    }
    namespace exec {
        function __promisify__(command: string): PromiseWithChild<{
            stdout: string;
            stderr: string;
        }>;
        function __promisify__(
            command: string,
            options: {
                encoding: 'buffer' | null;
            } & ExecOptions
        ): PromiseWithChild<{
            stdout: Buffer;
            stderr: Buffer;
        }>;
        function __promisify__(
            command: string,
            options: {
                encoding: BufferEncoding;
            } & ExecOptions
        ): PromiseWithChild<{
            stdout: string;
            stderr: string;
        }>;
        function __promisify__(
            command: string,
            options: ExecOptions
        ): PromiseWithChild<{
            stdout: string;
            stderr: string;
        }>;
        function __promisify__(
            command: string,
            options?: (ObjectEncodingOptions & ExecOptions) | null
        ): PromiseWithChild<{
            stdout: string | Buffer;
            stderr: string | Buffer;
        }>;
    }
    interface ExecFileOptions extends CommonOptions, Abortable {
        maxBuffer?: number | undefined;
        killSignal?: NodeJS.Signals | number | undefined;
        windowsVerbatimArguments?: boolean | undefined;
        shell?: boolean | string | undefined;
        signal?: AbortSignal | undefined;
    }
    interface ExecFileOptionsWithStringEncoding extends ExecFileOptions {
        encoding: BufferEncoding;
    }
    interface ExecFileOptionsWithBufferEncoding extends ExecFileOptions {
        encoding: 'buffer' | null;
    }
    interface ExecFileOptionsWithOtherEncoding extends ExecFileOptions {
        encoding: BufferEncoding;
    }
    type ExecFileException = ExecException & NodeJS.ErrnoException;
    /**
     * The `child_process.execFile()` function is similar to {@link exec} except that it does not spawn a shell by default. Rather, the specified
     * executable `file` is spawned directly as a new process making it slightly more
     * efficient than {@link exec}.
     *
     * The same options as {@link exec} are supported. Since a shell is
     * not spawned, behaviors such as I/O redirection and file globbing are not
     * supported.
     *
     * ```js
     * const { execFile } = require('child_process');
     * const child = execFile('node', ['--version'], (error, stdout, stderr) => {
     *   if (error) {
     *     throw error;
     *   }
     *   console.log(stdout);
     * });
     * ```
     *
     * The `stdout` and `stderr` arguments passed to the callback will contain the
     * stdout and stderr output of the child process. By default, Node.js will decode
     * the output as UTF-8 and pass strings to the callback. The `encoding` option
     * can be used to specify the character encoding used to decode the stdout and
     * stderr output. If `encoding` is `'buffer'`, or an unrecognized character
     * encoding, `Buffer` objects will be passed to the callback instead.
     *
     * If this method is invoked as its `util.promisify()` ed version, it returns
     * a `Promise` for an `Object` with `stdout` and `stderr` properties. The returned`ChildProcess` instance is attached to the `Promise` as a `child` property. In
     * case of an error (including any error resulting in an exit code other than 0), a
     * rejected promise is returned, with the same `error` object given in the
     * callback, but with two additional properties `stdout` and `stderr`.
     *
     * ```js
     * const util = require('util');
     * const execFile = util.promisify(require('child_process').execFile);
     * async function getVersion() {
     *   const { stdout } = await execFile('node', ['--version']);
     *   console.log(stdout);
     * }
     * getVersion();
     * ```
     *
     * **If the `shell` option is enabled, do not pass unsanitized user input to this**
     * **function. Any input containing shell metacharacters may be used to trigger**
     * **arbitrary command execution.**
     *
     * If the `signal` option is enabled, calling `.abort()` on the corresponding`AbortController` is similar to calling `.kill()` on the child process except
     * the error passed to the callback will be an `AbortError`:
     *
     * ```js
     * const { execFile } = require('child_process');
     * const controller = new AbortController();
     * const { signal } = controller;
     * const child = execFile('node', ['--version'], { signal }, (error) => {
     *   console.log(error); // an AbortError
     * });
     * controller.abort();
     * ```
     * @since v0.1.91
     * @param file The name or path of the executable file to run.
     * @param args List of string arguments.
     * @param callback Called with the output when process terminates.
     */
    function execFile(file: string): ChildProcess;
    function execFile(file: string, options: (ObjectEncodingOptions & ExecFileOptions) | undefined | null): ChildProcess;
    function execFile(file: string, args?: ReadonlyArray<string> | null): ChildProcess;
    function execFile(file: string, args: ReadonlyArray<string> | undefined | null, options: (ObjectEncodingOptions & ExecFileOptions) | undefined | null): ChildProcess;
    // no `options` definitely means stdout/stderr are `string`.
    function execFile(file: string, callback: (error: ExecFileException | null, stdout: string, stderr: string) => void): ChildProcess;
    function execFile(file: string, args: ReadonlyArray<string> | undefined | null, callback: (error: ExecFileException | null, stdout: string, stderr: string) => void): ChildProcess;
    // `options` with `"buffer"` or `null` for `encoding` means stdout/stderr are definitely `Buffer`.
    function execFile(file: string, options: ExecFileOptionsWithBufferEncoding, callback: (error: ExecFileException | null, stdout: Buffer, stderr: Buffer) => void): ChildProcess;
    function execFile(
        file: string,
        args: ReadonlyArray<string> | undefined | null,
        options: ExecFileOptionsWithBufferEncoding,
        callback: (error: ExecFileException | null, stdout: Buffer, stderr: Buffer) => void
    ): ChildProcess;
    // `options` with well known `encoding` means stdout/stderr are definitely `string`.
    function execFile(file: string, options: ExecFileOptionsWithStringEncoding, callback: (error: ExecFileException | null, stdout: string, stderr: string) => void): ChildProcess;
    function execFile(
        file: string,
        args: ReadonlyArray<string> | undefined | null,
        options: ExecFileOptionsWithStringEncoding,
        callback: (error: ExecFileException | null, stdout: string, stderr: string) => void
    ): ChildProcess;
    // `options` with an `encoding` whose type is `string` means stdout/stderr could either be `Buffer` or `string`.
    // There is no guarantee the `encoding` is unknown as `string` is a superset of `BufferEncoding`.
    function execFile(file: string, options: ExecFileOptionsWithOtherEncoding, callback: (error: ExecFileException | null, stdout: string | Buffer, stderr: string | Buffer) => void): ChildProcess;
    function execFile(
        file: string,
        args: ReadonlyArray<string> | undefined | null,
        options: ExecFileOptionsWithOtherEncoding,
        callback: (error: ExecFileException | null, stdout: string | Buffer, stderr: string | Buffer) => void
    ): ChildProcess;
    // `options` without an `encoding` means stdout/stderr are definitely `string`.
    function execFile(file: string, options: ExecFileOptions, callback: (error: ExecFileException | null, stdout: string, stderr: string) => void): ChildProcess;
    function execFile(
        file: string,
        args: ReadonlyArray<string> | undefined | null,
        options: ExecFileOptions,
        callback: (error: ExecFileException | null, stdout: string, stderr: string) => void
    ): ChildProcess;
    // fallback if nothing else matches. Worst case is always `string | Buffer`.
    function execFile(
        file: string,
        options: (ObjectEncodingOptions & ExecFileOptions) | undefined | null,
        callback: ((error: ExecFileException | null, stdout: string | Buffer, stderr: string | Buffer) => void) | undefined | null
    ): ChildProcess;
    function execFile(
        file: string,
        args: ReadonlyArray<string> | undefined | null,
        options: (ObjectEncodingOptions & ExecFileOptions) | undefined | null,
        callback: ((error: ExecFileException | null, stdout: string | Buffer, stderr: string | Buffer) => void) | undefined | null
    ): ChildProcess;
    namespace execFile {
        function __promisify__(file: string): PromiseWithChild<{
            stdout: string;
            stderr: string;
        }>;
        function __promisify__(
            file: string,
            args: ReadonlyArray<string> | undefined | null
        ): PromiseWithChild<{
            stdout: string;
            stderr: string;
        }>;
        function __promisify__(
            file: string,
            options: ExecFileOptionsWithBufferEncoding
        ): PromiseWithChild<{
            stdout: Buffer;
            stderr: Buffer;
        }>;
        function __promisify__(
            file: string,
            args: ReadonlyArray<string> | undefined | null,
            options: ExecFileOptionsWithBufferEncoding
        ): PromiseWithChild<{
            stdout: Buffer;
            stderr: Buffer;
        }>;
        function __promisify__(
            file: string,
            options: ExecFileOptionsWithStringEncoding
        ): PromiseWithChild<{
            stdout: string;
            stderr: string;
        }>;
        function __promisify__(
            file: string,
            args: ReadonlyArray<string> | undefined | null,
            options: ExecFileOptionsWithStringEncoding
        ): PromiseWithChild<{
            stdout: string;
            stderr: string;
        }>;
        function __promisify__(
            file: string,
            options: ExecFileOptionsWithOtherEncoding
        ): PromiseWithChild<{
            stdout: string | Buffer;
            stderr: string | Buffer;
        }>;
        function __promisify__(
            file: string,
            args: ReadonlyArray<string> | undefined | null,
            options: ExecFileOptionsWithOtherEncoding
        ): PromiseWithChild<{
            stdout: string | Buffer;
            stderr: string | Buffer;
        }>;
        function __promisify__(
            file: string,
            options: ExecFileOptions
        ): PromiseWithChild<{
            stdout: string;
            stderr: string;
        }>;
        function __promisify__(
            file: string,
            args: ReadonlyArray<string> | undefined | null,
            options: ExecFileOptions
        ): PromiseWithChild<{
            stdout: string;
            stderr: string;
        }>;
        function __promisify__(
            file: string,
            options: (ObjectEncodingOptions & ExecFileOptions) | undefined | null
        ): PromiseWithChild<{
            stdout: string | Buffer;
            stderr: string | Buffer;
        }>;
        function __promisify__(
            file: string,
            args: ReadonlyArray<string> | undefined | null,
            options: (ObjectEncodingOptions & ExecFileOptions) | undefined | null
        ): PromiseWithChild<{
            stdout: string | Buffer;
            stderr: string | Buffer;
        }>;
    }
    interface ForkOptions extends ProcessEnvOptions, MessagingOptions, Abortable {
        execPath?: string | undefined;
        execArgv?: string[] | undefined;
        silent?: boolean | undefined;
        stdio?: StdioOptions | undefined;
        detached?: boolean | undefined;
        windowsVerbatimArguments?: boolean | undefined;
    }
    /**
     * The `child_process.fork()` method is a special case of {@link spawn} used specifically to spawn new Node.js processes.
     * Like {@link spawn}, a `ChildProcess` object is returned. The
     * returned `ChildProcess` will have an additional communication channel
     * built-in that allows messages to be passed back and forth between the parent and
     * child. See `subprocess.send()` for details.
     *
     * Keep in mind that spawned Node.js child processes are
     * independent of the parent with exception of the IPC communication channel
     * that is established between the two. Each process has its own memory, with
     * their own V8 instances. Because of the additional resource allocations
     * required, spawning a large number of child Node.js processes is not
     * recommended.
     *
     * By default, `child_process.fork()` will spawn new Node.js instances using the `process.execPath` of the parent process. The `execPath` property in the`options` object allows for an alternative
     * execution path to be used.
     *
     * Node.js processes launched with a custom `execPath` will communicate with the
     * parent process using the file descriptor (fd) identified using the
     * environment variable `NODE_CHANNEL_FD` on the child process.
     *
     * Unlike the [`fork(2)`](http://man7.org/linux/man-pages/man2/fork.2.html) POSIX system call, `child_process.fork()` does not clone the
     * current process.
     *
     * The `shell` option available in {@link spawn} is not supported by`child_process.fork()` and will be ignored if set.
     *
     * If the `signal` option is enabled, calling `.abort()` on the corresponding`AbortController` is similar to calling `.kill()` on the child process except
     * the error passed to the callback will be an `AbortError`:
     *
     * ```js
     * if (process.argv[2] === 'child') {
     *   setTimeout(() => {
     *     console.log(`Hello from ${process.argv[2]}!`);
     *   }, 1_000);
     * } else {
     *   const { fork } = require('child_process');
     *   const controller = new AbortController();
     *   const { signal } = controller;
     *   const child = fork(__filename, ['child'], { signal });
     *   child.on('error', (err) => {
     *     // This will be called with err being an AbortError if the controller aborts
     *   });
     *   controller.abort(); // Stops the child process
     * }
     * ```
     * @since v0.5.0
     * @param modulePath The module to run in the child.
     * @param args List of string arguments.
     */
    function fork(modulePath: string, options?: ForkOptions): ChildProcess;
    function fork(modulePath: string, args?: ReadonlyArray<string>, options?: ForkOptions): ChildProcess;
    interface SpawnSyncOptions extends CommonSpawnOptions {
        input?: string | NodeJS.ArrayBufferView | undefined;
        maxBuffer?: number | undefined;
        encoding?: BufferEncoding | 'buffer' | null | undefined;
    }
    interface SpawnSyncOptionsWithStringEncoding extends SpawnSyncOptions {
        encoding: BufferEncoding;
    }
    interface SpawnSyncOptionsWithBufferEncoding extends SpawnSyncOptions {
        encoding?: 'buffer' | null | undefined;
    }
    interface SpawnSyncReturns<T> {
        pid: number;
        output: Array<T | null>;
        stdout: T;
        stderr: T;
        status: number | null;
        signal: NodeJS.Signals | null;
        error?: Error | undefined;
    }
    /**
     * The `child_process.spawnSync()` method is generally identical to {@link spawn} with the exception that the function will not return
     * until the child process has fully closed. When a timeout has been encountered
     * and `killSignal` is sent, the method won't return until the process has
     * completely exited. If the process intercepts and handles the `SIGTERM` signal
     * and doesn't exit, the parent process will wait until the child process has
     * exited.
     *
     * **If the `shell` option is enabled, do not pass unsanitized user input to this**
     * **function. Any input containing shell metacharacters may be used to trigger**
     * **arbitrary command execution.**
     * @since v0.11.12
     * @param command The command to run.
     * @param args List of string arguments.
     */
    function spawnSync(command: string): SpawnSyncReturns<Buffer>;
    function spawnSync(command: string, options: SpawnSyncOptionsWithStringEncoding): SpawnSyncReturns<string>;
    function spawnSync(command: string, options: SpawnSyncOptionsWithBufferEncoding): SpawnSyncReturns<Buffer>;
    function spawnSync(command: string, options?: SpawnSyncOptions): SpawnSyncReturns<string | Buffer>;
    function spawnSync(command: string, args: ReadonlyArray<string>): SpawnSyncReturns<Buffer>;
    function spawnSync(command: string, args: ReadonlyArray<string>, options: SpawnSyncOptionsWithStringEncoding): SpawnSyncReturns<string>;
    function spawnSync(command: string, args: ReadonlyArray<string>, options: SpawnSyncOptionsWithBufferEncoding): SpawnSyncReturns<Buffer>;
    function spawnSync(command: string, args?: ReadonlyArray<string>, options?: SpawnSyncOptions): SpawnSyncReturns<string | Buffer>;
    interface CommonExecOptions extends CommonOptions {
        input?: string | NodeJS.ArrayBufferView | undefined;
        stdio?: StdioOptions | undefined;
        killSignal?: NodeJS.Signals | number | undefined;
        maxBuffer?: number | undefined;
        encoding?: BufferEncoding | 'buffer' | null | undefined;
    }
    interface ExecSyncOptions extends CommonExecOptions {
        shell?: string | undefined;
    }
    interface ExecSyncOptionsWithStringEncoding extends ExecSyncOptions {
        encoding: BufferEncoding;
    }
    interface ExecSyncOptionsWithBufferEncoding extends ExecSyncOptions {
        encoding?: 'buffer' | null | undefined;
    }
    /**
     * The `child_process.execSync()` method is generally identical to {@link exec} with the exception that the method will not return
     * until the child process has fully closed. When a timeout has been encountered
     * and `killSignal` is sent, the method won't return until the process has
     * completely exited. If the child process intercepts and handles the `SIGTERM`signal and doesn't exit, the parent process will wait until the child process
     * has exited.
     *
     * If the process times out or has a non-zero exit code, this method will throw.
     * The `Error` object will contain the entire result from {@link spawnSync}.
     *
     * **Never pass unsanitized user input to this function. Any input containing shell**
     * **metacharacters may be used to trigger arbitrary command execution.**
     * @since v0.11.12
     * @param command The command to run.
     * @return The stdout from the command.
     */
    function execSync(command: string): Buffer;
    function execSync(command: string, options: ExecSyncOptionsWithStringEncoding): string;
    function execSync(command: string, options: ExecSyncOptionsWithBufferEncoding): Buffer;
    function execSync(command: string, options?: ExecSyncOptions): string | Buffer;
    interface ExecFileSyncOptions extends CommonExecOptions {
        shell?: boolean | string | undefined;
    }
    interface ExecFileSyncOptionsWithStringEncoding extends ExecFileSyncOptions {
        encoding: BufferEncoding;
    }
    interface ExecFileSyncOptionsWithBufferEncoding extends ExecFileSyncOptions {
        encoding?: 'buffer' | null; // specify `null`.
    }
    /**
     * The `child_process.execFileSync()` method is generally identical to {@link execFile} with the exception that the method will not
     * return until the child process has fully closed. When a timeout has been
     * encountered and `killSignal` is sent, the method won't return until the process
     * has completely exited.
     *
     * If the child process intercepts and handles the `SIGTERM` signal and
     * does not exit, the parent process will still wait until the child process has
     * exited.
     *
     * If the process times out or has a non-zero exit code, this method will throw an `Error` that will include the full result of the underlying {@link spawnSync}.
     *
     * **If the `shell` option is enabled, do not pass unsanitized user input to this**
     * **function. Any input containing shell metacharacters may be used to trigger**
     * **arbitrary command execution.**
     * @since v0.11.12
     * @param file The name or path of the executable file to run.
     * @param args List of string arguments.
     * @return The stdout from the command.
     */
    function execFileSync(file: string): Buffer;
    function execFileSync(file: string, options: ExecFileSyncOptionsWithStringEncoding): string;
    function execFileSync(file: string, options: ExecFileSyncOptionsWithBufferEncoding): Buffer;
    function execFileSync(file: string, options?: ExecFileSyncOptions): string | Buffer;
    function execFileSync(file: string, args: ReadonlyArray<string>): Buffer;
    function execFileSync(file: string, args: ReadonlyArray<string>, options: ExecFileSyncOptionsWithStringEncoding): string;
    function execFileSync(file: string, args: ReadonlyArray<string>, options: ExecFileSyncOptionsWithBufferEncoding): Buffer;
    function execFileSync(file: string, args?: ReadonlyArray<string>, options?: ExecFileSyncOptions): string | Buffer;
}
declare module 'node:child_process' {
    export * from 'child_process';
}