net.d.ts

/**
 * > Stability: 2 - Stable
 *
 * The `net` module provides an asynchronous network API for creating stream-based
 * TCP or `IPC` servers ({@link createServer}) and clients
 * ({@link createConnection}).
 *
 * It can be accessed using:
 *
 * ```js
 * const net = require('net');
 * ```
 * @see [source](https://github.com/nodejs/node/blob/v17.0.0/lib/net.js)
 */
declare module 'net' {
    import * as stream from 'node:stream';
    import { Abortable, EventEmitter } from 'node:events';
    import * as dns from 'node:dns';
    type LookupFunction = (hostname: string, options: dns.LookupOneOptions, callback: (err: NodeJS.ErrnoException | null, address: string, family: number) => void) => void;
    interface AddressInfo {
        address: string;
        family: string;
        port: number;
    }
    interface SocketConstructorOpts {
        fd?: number | undefined;
        allowHalfOpen?: boolean | undefined;
        readable?: boolean | undefined;
        writable?: boolean | undefined;
        signal?: AbortSignal;
    }
    interface OnReadOpts {
        buffer: Uint8Array | (() => Uint8Array);
        /**
         * This function is called for every chunk of incoming data.
         * Two arguments are passed to it: the number of bytes written to buffer and a reference to buffer.
         * Return false from this function to implicitly pause() the socket.
         */
        callback(bytesWritten: number, buf: Uint8Array): boolean;
    }
    interface ConnectOpts {
        /**
         * If specified, incoming data is stored in a single buffer and passed to the supplied callback when data arrives on the socket.
         * Note: this will cause the streaming functionality to not provide any data, however events like 'error', 'end', and 'close' will
         * still be emitted as normal and methods like pause() and resume() will also behave as expected.
         */
        onread?: OnReadOpts | undefined;
    }
    interface TcpSocketConnectOpts extends ConnectOpts {
        port: number;
        host?: string | undefined;
        localAddress?: string | undefined;
        localPort?: number | undefined;
        hints?: number | undefined;
        family?: number | undefined;
        lookup?: LookupFunction | undefined;
    }
    interface IpcSocketConnectOpts extends ConnectOpts {
        path: string;
    }
    type SocketConnectOpts = TcpSocketConnectOpts | IpcSocketConnectOpts;
    /**
     * This class is an abstraction of a TCP socket or a streaming `IPC` endpoint
     * (uses named pipes on Windows, and Unix domain sockets otherwise). It is also
     * an `EventEmitter`.
     *
     * A `net.Socket` can be created by the user and used directly to interact with
     * a server. For example, it is returned by {@link createConnection},
     * so the user can use it to talk to the server.
     *
     * It can also be created by Node.js and passed to the user when a connection
     * is received. For example, it is passed to the listeners of a `'connection'` event emitted on a {@link Server}, so the user can use
     * it to interact with the client.
     * @since v0.3.4
     */
    class Socket extends stream.Duplex {
        constructor(options?: SocketConstructorOpts);
        /**
         * Sends data on the socket. The second parameter specifies the encoding in the
         * case of a string. It defaults to UTF8 encoding.
         *
         * Returns `true` if the entire data was flushed successfully to the kernel
         * buffer. Returns `false` if all or part of the data was queued in user memory.`'drain'` will be emitted when the buffer is again free.
         *
         * The optional `callback` parameter will be executed when the data is finally
         * written out, which may not be immediately.
         *
         * See `Writable` stream `write()` method for more
         * information.
         * @since v0.1.90
         * @param [encoding='utf8'] Only used when data is `string`.
         */
        write(buffer: Uint8Array | string, cb?: (err?: Error) => void): boolean;
        write(str: Uint8Array | string, encoding?: BufferEncoding, cb?: (err?: Error) => void): boolean;
        /**
         * Initiate a connection on a given socket.
         *
         * Possible signatures:
         *
         * * `socket.connect(options[, connectListener])`
         * * `socket.connect(path[, connectListener])` for `IPC` connections.
         * * `socket.connect(port[, host][, connectListener])` for TCP connections.
         * * Returns: `net.Socket` The socket itself.
         *
         * This function is asynchronous. When the connection is established, the `'connect'` event will be emitted. If there is a problem connecting,
         * instead of a `'connect'` event, an `'error'` event will be emitted with
         * the error passed to the `'error'` listener.
         * The last parameter `connectListener`, if supplied, will be added as a listener
         * for the `'connect'` event **once**.
         *
         * This function should only be used for reconnecting a socket after`'close'` has been emitted or otherwise it may lead to undefined
         * behavior.
         */
        connect(options: SocketConnectOpts, connectionListener?: () => void): this;
        connect(port: number, host: string, connectionListener?: () => void): this;
        connect(port: number, connectionListener?: () => void): this;
        connect(path: string, connectionListener?: () => void): this;
        /**
         * Set the encoding for the socket as a `Readable Stream`. See `readable.setEncoding()` for more information.
         * @since v0.1.90
         * @return The socket itself.
         */
        setEncoding(encoding?: BufferEncoding): this;
        /**
         * Pauses the reading of data. That is, `'data'` events will not be emitted.
         * Useful to throttle back an upload.
         * @return The socket itself.
         */
        pause(): this;
        /**
         * Resumes reading after a call to `socket.pause()`.
         * @return The socket itself.
         */
        resume(): this;
        /**
         * Sets the socket to timeout after `timeout` milliseconds of inactivity on
         * the socket. By default `net.Socket` do not have a timeout.
         *
         * When an idle timeout is triggered the socket will receive a `'timeout'` event but the connection will not be severed. The user must manually call `socket.end()` or `socket.destroy()` to
         * end the connection.
         *
         * ```js
         * socket.setTimeout(3000);
         * socket.on('timeout', () => {
         *   console.log('socket timeout');
         *   socket.end();
         * });
         * ```
         *
         * If `timeout` is 0, then the existing idle timeout is disabled.
         *
         * The optional `callback` parameter will be added as a one-time listener for the `'timeout'` event.
         * @since v0.1.90
         * @return The socket itself.
         */
        setTimeout(timeout: number, callback?: () => void): this;
        /**
         * Enable/disable the use of Nagle's algorithm.
         *
         * When a TCP connection is created, it will have Nagle's algorithm enabled.
         *
         * Nagle's algorithm delays data before it is sent via the network. It attempts
         * to optimize throughput at the expense of latency.
         *
         * Passing `true` for `noDelay` or not passing an argument will disable Nagle's
         * algorithm for the socket. Passing `false` for `noDelay` will enable Nagle's
         * algorithm.
         * @since v0.1.90
         * @param [noDelay=true]
         * @return The socket itself.
         */
        setNoDelay(noDelay?: boolean): this;
        /**
         * Enable/disable keep-alive functionality, and optionally set the initial
         * delay before the first keepalive probe is sent on an idle socket.
         *
         * Set `initialDelay` (in milliseconds) to set the delay between the last
         * data packet received and the first keepalive probe. Setting `0` for`initialDelay` will leave the value unchanged from the default
         * (or previous) setting.
         *
         * Enabling the keep-alive functionality will set the following socket options:
         *
         * * `SO_KEEPALIVE=1`
         * * `TCP_KEEPIDLE=initialDelay`
         * * `TCP_KEEPCNT=10`
         * * `TCP_KEEPINTVL=1`
         * @since v0.1.92
         * @param [enable=false]
         * @param [initialDelay=0]
         * @return The socket itself.
         */
        setKeepAlive(enable?: boolean, initialDelay?: number): this;
        /**
         * Returns the bound `address`, the address `family` name and `port` of the
         * socket as reported by the operating system:`{ port: 12346, family: 'IPv4', address: '127.0.0.1' }`
         * @since v0.1.90
         */
        address(): AddressInfo | {};
        /**
         * Calling `unref()` on a socket will allow the program to exit if this is the only
         * active socket in the event system. If the socket is already `unref`ed calling`unref()` again will have no effect.
         * @since v0.9.1
         * @return The socket itself.
         */
        unref(): this;
        /**
         * Opposite of `unref()`, calling `ref()` on a previously `unref`ed socket will_not_ let the program exit if it's the only socket left (the default behavior).
         * If the socket is `ref`ed calling `ref` again will have no effect.
         * @since v0.9.1
         * @return The socket itself.
         */
        ref(): this;
        /**
         * This property shows the number of characters buffered for writing. The buffer
         * may contain strings whose length after encoding is not yet known. So this number
         * is only an approximation of the number of bytes in the buffer.
         *
         * `net.Socket` has the property that `socket.write()` always works. This is to
         * help users get up and running quickly. The computer cannot always keep up
         * with the amount of data that is written to a socket. The network connection
         * simply might be too slow. Node.js will internally queue up the data written to a
         * socket and send it out over the wire when it is possible.
         *
         * The consequence of this internal buffering is that memory may grow.
         * Users who experience large or growing `bufferSize` should attempt to
         * "throttle" the data flows in their program with `socket.pause()` and `socket.resume()`.
         * @since v0.3.8
         * @deprecated Since v14.6.0 - Use `writableLength` instead.
         */
        readonly bufferSize: number;
        /**
         * The amount of received bytes.
         * @since v0.5.3
         */
        readonly bytesRead: number;
        /**
         * The amount of bytes sent.
         * @since v0.5.3
         */
        readonly bytesWritten: number;
        /**
         * If `true`,`socket.connect(options[, connectListener])` was
         * called and has not yet finished. It will stay `true` until the socket becomes
         * connected, then it is set to `false` and the `'connect'` event is emitted. Note
         * that the `socket.connect(options[, connectListener])` callback is a listener for the `'connect'` event.
         * @since v6.1.0
         */
        readonly connecting: boolean;
        /**
         * See `writable.destroyed` for further details.
         */
        readonly destroyed: boolean;
        /**
         * The string representation of the local IP address the remote client is
         * connecting on. For example, in a server listening on `'0.0.0.0'`, if a client
         * connects on `'192.168.1.1'`, the value of `socket.localAddress` would be`'192.168.1.1'`.
         * @since v0.9.6
         */
        readonly localAddress?: string;
        /**
         * The numeric representation of the local port. For example, `80` or `21`.
         * @since v0.9.6
         */
        readonly localPort?: number;
        /**
         * The string representation of the remote IP address. For example,`'74.125.127.100'` or `'2001:4860:a005::68'`. Value may be `undefined` if
         * the socket is destroyed (for example, if the client disconnected).
         * @since v0.5.10
         */
        readonly remoteAddress?: string | undefined;
        /**
         * The string representation of the remote IP family. `'IPv4'` or `'IPv6'`.
         * @since v0.11.14
         */
        readonly remoteFamily?: string | undefined;
        /**
         * The numeric representation of the remote port. For example, `80` or `21`.
         * @since v0.5.10
         */
        readonly remotePort?: number | undefined;
        /**
         * Half-closes the socket. i.e., it sends a FIN packet. It is possible the
         * server will still send some data.
         *
         * See `writable.end()` for further details.
         * @since v0.1.90
         * @param [encoding='utf8'] Only used when data is `string`.
         * @param callback Optional callback for when the socket is finished.
         * @return The socket itself.
         */
        end(callback?: () => void): this;
        end(buffer: Uint8Array | string, callback?: () => void): this;
        end(str: Uint8Array | string, encoding?: BufferEncoding, callback?: () => void): this;
        /**
         * events.EventEmitter
         *   1. close
         *   2. connect
         *   3. data
         *   4. drain
         *   5. end
         *   6. error
         *   7. lookup
         *   8. timeout
         */
        addListener(event: string, listener: (...args: any[]) => void): this;
        addListener(event: 'close', listener: (hadError: boolean) => void): this;
        addListener(event: 'connect', listener: () => void): this;
        addListener(event: 'data', listener: (data: Buffer) => void): this;
        addListener(event: 'drain', listener: () => void): this;
        addListener(event: 'end', listener: () => void): this;
        addListener(event: 'error', listener: (err: Error) => void): this;
        addListener(event: 'lookup', listener: (err: Error, address: string, family: string | number, host: string) => void): this;
        addListener(event: 'ready', listener: () => void): this;
        addListener(event: 'timeout', listener: () => void): this;
        emit(event: string | symbol, ...args: any[]): boolean;
        emit(event: 'close', hadError: boolean): boolean;
        emit(event: 'connect'): boolean;
        emit(event: 'data', data: Buffer): boolean;
        emit(event: 'drain'): boolean;
        emit(event: 'end'): boolean;
        emit(event: 'error', err: Error): boolean;
        emit(event: 'lookup', err: Error, address: string, family: string | number, host: string): boolean;
        emit(event: 'ready'): boolean;
        emit(event: 'timeout'): boolean;
        on(event: string, listener: (...args: any[]) => void): this;
        on(event: 'close', listener: (hadError: boolean) => void): this;
        on(event: 'connect', listener: () => void): this;
        on(event: 'data', listener: (data: Buffer) => void): this;
        on(event: 'drain', listener: () => void): this;
        on(event: 'end', listener: () => void): this;
        on(event: 'error', listener: (err: Error) => void): this;
        on(event: 'lookup', listener: (err: Error, address: string, family: string | number, host: string) => void): this;
        on(event: 'ready', listener: () => void): this;
        on(event: 'timeout', listener: () => void): this;
        once(event: string, listener: (...args: any[]) => void): this;
        once(event: 'close', listener: (hadError: boolean) => void): this;
        once(event: 'connect', listener: () => void): this;
        once(event: 'data', listener: (data: Buffer) => void): this;
        once(event: 'drain', listener: () => void): this;
        once(event: 'end', listener: () => void): this;
        once(event: 'error', listener: (err: Error) => void): this;
        once(event: 'lookup', listener: (err: Error, address: string, family: string | number, host: string) => void): this;
        once(event: 'ready', listener: () => void): this;
        once(event: 'timeout', listener: () => void): this;
        prependListener(event: string, listener: (...args: any[]) => void): this;
        prependListener(event: 'close', listener: (hadError: boolean) => void): this;
        prependListener(event: 'connect', listener: () => void): this;
        prependListener(event: 'data', listener: (data: Buffer) => void): this;
        prependListener(event: 'drain', listener: () => void): this;
        prependListener(event: 'end', listener: () => void): this;
        prependListener(event: 'error', listener: (err: Error) => void): this;
        prependListener(event: 'lookup', listener: (err: Error, address: string, family: string | number, host: string) => void): this;
        prependListener(event: 'ready', listener: () => void): this;
        prependListener(event: 'timeout', listener: () => void): this;
        prependOnceListener(event: string, listener: (...args: any[]) => void): this;
        prependOnceListener(event: 'close', listener: (hadError: boolean) => void): this;
        prependOnceListener(event: 'connect', listener: () => void): this;
        prependOnceListener(event: 'data', listener: (data: Buffer) => void): this;
        prependOnceListener(event: 'drain', listener: () => void): this;
        prependOnceListener(event: 'end', listener: () => void): this;
        prependOnceListener(event: 'error', listener: (err: Error) => void): this;
        prependOnceListener(event: 'lookup', listener: (err: Error, address: string, family: string | number, host: string) => void): this;
        prependOnceListener(event: 'ready', listener: () => void): this;
        prependOnceListener(event: 'timeout', listener: () => void): this;
    }
    interface ListenOptions extends Abortable {
        port?: number | undefined;
        host?: string | undefined;
        backlog?: number | undefined;
        path?: string | undefined;
        exclusive?: boolean | undefined;
        readableAll?: boolean | undefined;
        writableAll?: boolean | undefined;
        /**
         * @default false
         */
        ipv6Only?: boolean | undefined;
    }
    interface ServerOpts {
        /**
         * Indicates whether half-opened TCP connections are allowed.
         * @default false
         */
        allowHalfOpen?: boolean | undefined;
        /**
         * Indicates whether the socket should be paused on incoming connections.
         * @default false
         */
        pauseOnConnect?: boolean | undefined;
    }
    /**
     * This class is used to create a TCP or `IPC` server.
     * @since v0.1.90
     */
    class Server extends EventEmitter {
        constructor(connectionListener?: (socket: Socket) => void);
        constructor(options?: ServerOpts, connectionListener?: (socket: Socket) => void);
        /**
         * Start a server listening for connections. A `net.Server` can be a TCP or
         * an `IPC` server depending on what it listens to.
         *
         * Possible signatures:
         *
         * * `server.listen(handle[, backlog][, callback])`
         * * `server.listen(options[, callback])`
         * * `server.listen(path[, backlog][, callback])` for `IPC` servers
         * * `server.listen([port[, host[, backlog]]][, callback])` for TCP servers
         *
         * This function is asynchronous. When the server starts listening, the `'listening'` event will be emitted. The last parameter `callback`will be added as a listener for the `'listening'`
         * event.
         *
         * All `listen()` methods can take a `backlog` parameter to specify the maximum
         * length of the queue of pending connections. The actual length will be determined
         * by the OS through sysctl settings such as `tcp_max_syn_backlog` and `somaxconn`on Linux. The default value of this parameter is 511 (not 512).
         *
         * All {@link Socket} are set to `SO_REUSEADDR` (see [`socket(7)`](https://man7.org/linux/man-pages/man7/socket.7.html) for
         * details).
         *
         * The `server.listen()` method can be called again if and only if there was an
         * error during the first `server.listen()` call or `server.close()` has been
         * called. Otherwise, an `ERR_SERVER_ALREADY_LISTEN` error will be thrown.
         *
         * One of the most common errors raised when listening is `EADDRINUSE`.
         * This happens when another server is already listening on the requested`port`/`path`/`handle`. One way to handle this would be to retry
         * after a certain amount of time:
         *
         * ```js
         * server.on('error', (e) => {
         *   if (e.code === 'EADDRINUSE') {
         *     console.log('Address in use, retrying...');
         *     setTimeout(() => {
         *       server.close();
         *       server.listen(PORT, HOST);
         *     }, 1000);
         *   }
         * });
         * ```
         */
        listen(port?: number, hostname?: string, backlog?: number, listeningListener?: () => void): this;
        listen(port?: number, hostname?: string, listeningListener?: () => void): this;
        listen(port?: number, backlog?: number, listeningListener?: () => void): this;
        listen(port?: number, listeningListener?: () => void): this;
        listen(path: string, backlog?: number, listeningListener?: () => void): this;
        listen(path: string, listeningListener?: () => void): this;
        listen(options: ListenOptions, listeningListener?: () => void): this;
        listen(handle: any, backlog?: number, listeningListener?: () => void): this;
        listen(handle: any, listeningListener?: () => void): this;
        /**
         * Stops the server from accepting new connections and keeps existing
         * connections. This function is asynchronous, the server is finally closed
         * when all connections are ended and the server emits a `'close'` event.
         * The optional `callback` will be called once the `'close'` event occurs. Unlike
         * that event, it will be called with an `Error` as its only argument if the server
         * was not open when it was closed.
         * @since v0.1.90
         * @param callback Called when the server is closed.
         */
        close(callback?: (err?: Error) => void): this;
        /**
         * Returns the bound `address`, the address `family` name, and `port` of the server
         * as reported by the operating system if listening on an IP socket
         * (useful to find which port was assigned when getting an OS-assigned address):`{ port: 12346, family: 'IPv4', address: '127.0.0.1' }`.
         *
         * For a server listening on a pipe or Unix domain socket, the name is returned
         * as a string.
         *
         * ```js
         * const server = net.createServer((socket) => {
         *   socket.end('goodbye\n');
         * }).on('error', (err) => {
         *   // Handle errors here.
         *   throw err;
         * });
         *
         * // Grab an arbitrary unused port.
         * server.listen(() => {
         *   console.log('opened server on', server.address());
         * });
         * ```
         *
         * `server.address()` returns `null` before the `'listening'` event has been
         * emitted or after calling `server.close()`.
         * @since v0.1.90
         */
        address(): AddressInfo | string | null;
        /**
         * Asynchronously get the number of concurrent connections on the server. Works
         * when sockets were sent to forks.
         *
         * Callback should take two arguments `err` and `count`.
         * @since v0.9.7
         */
        getConnections(cb: (error: Error | null, count: number) => void): void;
        /**
         * Opposite of `unref()`, calling `ref()` on a previously `unref`ed server will_not_ let the program exit if it's the only server left (the default behavior).
         * If the server is `ref`ed calling `ref()` again will have no effect.
         * @since v0.9.1
         */
        ref(): this;
        /**
         * Calling `unref()` on a server will allow the program to exit if this is the only
         * active server in the event system. If the server is already `unref`ed calling`unref()` again will have no effect.
         * @since v0.9.1
         */
        unref(): this;
        /**
         * Set this property to reject connections when the server's connection count gets
         * high.
         *
         * It is not recommended to use this option once a socket has been sent to a child
         * with `child_process.fork()`.
         * @since v0.2.0
         */
        maxConnections: number;
        connections: number;
        /**
         * Indicates whether or not the server is listening for connections.
         * @since v5.7.0
         */
        listening: boolean;
        /**
         * events.EventEmitter
         *   1. close
         *   2. connection
         *   3. error
         *   4. listening
         */
        addListener(event: string, listener: (...args: any[]) => void): this;
        addListener(event: 'close', listener: () => void): this;
        addListener(event: 'connection', listener: (socket: Socket) => void): this;
        addListener(event: 'error', listener: (err: Error) => void): this;
        addListener(event: 'listening', listener: () => void): this;
        emit(event: string | symbol, ...args: any[]): boolean;
        emit(event: 'close'): boolean;
        emit(event: 'connection', socket: Socket): boolean;
        emit(event: 'error', err: Error): boolean;
        emit(event: 'listening'): boolean;
        on(event: string, listener: (...args: any[]) => void): this;
        on(event: 'close', listener: () => void): this;
        on(event: 'connection', listener: (socket: Socket) => void): this;
        on(event: 'error', listener: (err: Error) => void): this;
        on(event: 'listening', listener: () => void): this;
        once(event: string, listener: (...args: any[]) => void): this;
        once(event: 'close', listener: () => void): this;
        once(event: 'connection', listener: (socket: Socket) => void): this;
        once(event: 'error', listener: (err: Error) => void): this;
        once(event: 'listening', listener: () => void): this;
        prependListener(event: string, listener: (...args: any[]) => void): this;
        prependListener(event: 'close', listener: () => void): this;
        prependListener(event: 'connection', listener: (socket: Socket) => void): this;
        prependListener(event: 'error', listener: (err: Error) => void): this;
        prependListener(event: 'listening', listener: () => void): this;
        prependOnceListener(event: string, listener: (...args: any[]) => void): this;
        prependOnceListener(event: 'close', listener: () => void): this;
        prependOnceListener(event: 'connection', listener: (socket: Socket) => void): this;
        prependOnceListener(event: 'error', listener: (err: Error) => void): this;
        prependOnceListener(event: 'listening', listener: () => void): this;
    }
    type IPVersion = 'ipv4' | 'ipv6';
    /**
     * The `BlockList` object can be used with some network APIs to specify rules for
     * disabling inbound or outbound access to specific IP addresses, IP ranges, or
     * IP subnets.
     * @since v15.0.0, v14.18.0
     */
    class BlockList {
        /**
         * Adds a rule to block the given IP address.
         * @since v15.0.0, v14.18.0
         * @param address An IPv4 or IPv6 address.
         * @param [type='ipv4'] Either `'ipv4'` or `'ipv6'`.
         */
        addAddress(address: string, type?: IPVersion): void;
        addAddress(address: SocketAddress): void;
        /**
         * Adds a rule to block a range of IP addresses from `start` (inclusive) to`end` (inclusive).
         * @since v15.0.0, v14.18.0
         * @param start The starting IPv4 or IPv6 address in the range.
         * @param end The ending IPv4 or IPv6 address in the range.
         * @param [type='ipv4'] Either `'ipv4'` or `'ipv6'`.
         */
        addRange(start: string, end: string, type?: IPVersion): void;
        addRange(start: SocketAddress, end: SocketAddress): void;
        /**
         * Adds a rule to block a range of IP addresses specified as a subnet mask.
         * @since v15.0.0, v14.18.0
         * @param net The network IPv4 or IPv6 address.
         * @param prefix The number of CIDR prefix bits. For IPv4, this must be a value between `0` and `32`. For IPv6, this must be between `0` and `128`.
         * @param [type='ipv4'] Either `'ipv4'` or `'ipv6'`.
         */
        addSubnet(net: SocketAddress, prefix: number): void;
        addSubnet(net: string, prefix: number, type?: IPVersion): void;
        /**
         * Returns `true` if the given IP address matches any of the rules added to the`BlockList`.
         *
         * ```js
         * const blockList = new net.BlockList();
         * blockList.addAddress('123.123.123.123');
         * blockList.addRange('10.0.0.1', '10.0.0.10');
         * blockList.addSubnet('8592:757c:efae:4e45::', 64, 'ipv6');
         *
         * console.log(blockList.check('123.123.123.123'));  // Prints: true
         * console.log(blockList.check('10.0.0.3'));  // Prints: true
         * console.log(blockList.check('222.111.111.222'));  // Prints: false
         *
         * // IPv6 notation for IPv4 addresses works:
         * console.log(blockList.check('::ffff:7b7b:7b7b', 'ipv6')); // Prints: true
         * console.log(blockList.check('::ffff:123.123.123.123', 'ipv6')); // Prints: true
         * ```
         * @since v15.0.0, v14.18.0
         * @param address The IP address to check
         * @param [type='ipv4'] Either `'ipv4'` or `'ipv6'`.
         */
        check(address: SocketAddress): boolean;
        check(address: string, type?: IPVersion): boolean;
    }
    interface TcpNetConnectOpts extends TcpSocketConnectOpts, SocketConstructorOpts {
        timeout?: number | undefined;
    }
    interface IpcNetConnectOpts extends IpcSocketConnectOpts, SocketConstructorOpts {
        timeout?: number | undefined;
    }
    type NetConnectOpts = TcpNetConnectOpts | IpcNetConnectOpts;
    /**
     * Creates a new TCP or `IPC` server.
     *
     * If `allowHalfOpen` is set to `true`, when the other end of the socket
     * signals the end of transmission, the server will only send back the end of
     * transmission when `socket.end()` is explicitly called. For example, in the
     * context of TCP, when a FIN packed is received, a FIN packed is sent
     * back only when `socket.end()` is explicitly called. Until then the
     * connection is half-closed (non-readable but still writable). See `'end'` event and [RFC 1122](https://tools.ietf.org/html/rfc1122) (section 4.2.2.13) for more information.
     *
     * If `pauseOnConnect` is set to `true`, then the socket associated with each
     * incoming connection will be paused, and no data will be read from its handle.
     * This allows connections to be passed between processes without any data being
     * read by the original process. To begin reading data from a paused socket, call `socket.resume()`.
     *
     * The server can be a TCP server or an `IPC` server, depending on what it `listen()` to.
     *
     * Here is an example of an TCP echo server which listens for connections
     * on port 8124:
     *
     * ```js
     * const net = require('net');
     * const server = net.createServer((c) => {
     *   // 'connection' listener.
     *   console.log('client connected');
     *   c.on('end', () => {
     *     console.log('client disconnected');
     *   });
     *   c.write('hello\r\n');
     *   c.pipe(c);
     * });
     * server.on('error', (err) => {
     *   throw err;
     * });
     * server.listen(8124, () => {
     *   console.log('server bound');
     * });
     * ```
     *
     * Test this by using `telnet`:
     *
     * ```console
     * $ telnet localhost 8124
     * ```
     *
     * To listen on the socket `/tmp/echo.sock`:
     *
     * ```js
     * server.listen('/tmp/echo.sock', () => {
     *   console.log('server bound');
     * });
     * ```
     *
     * Use `nc` to connect to a Unix domain socket server:
     *
     * ```console
     * $ nc -U /tmp/echo.sock
     * ```
     * @since v0.5.0
     * @param connectionListener Automatically set as a listener for the {@link 'connection'} event.
     */
    function createServer(connectionListener?: (socket: Socket) => void): Server;
    function createServer(options?: ServerOpts, connectionListener?: (socket: Socket) => void): Server;
    /**
     * Aliases to {@link createConnection}.
     *
     * Possible signatures:
     *
     * * {@link connect}
     * * {@link connect} for `IPC` connections.
     * * {@link connect} for TCP connections.
     */
    function connect(options: NetConnectOpts, connectionListener?: () => void): Socket;
    function connect(port: number, host?: string, connectionListener?: () => void): Socket;
    function connect(path: string, connectionListener?: () => void): Socket;
    /**
     * A factory function, which creates a new {@link Socket},
     * immediately initiates connection with `socket.connect()`,
     * then returns the `net.Socket` that starts the connection.
     *
     * When the connection is established, a `'connect'` event will be emitted
     * on the returned socket. The last parameter `connectListener`, if supplied,
     * will be added as a listener for the `'connect'` event **once**.
     *
     * Possible signatures:
     *
     * * {@link createConnection}
     * * {@link createConnection} for `IPC` connections.
     * * {@link createConnection} for TCP connections.
     *
     * The {@link connect} function is an alias to this function.
     */
    function createConnection(options: NetConnectOpts, connectionListener?: () => void): Socket;
    function createConnection(port: number, host?: string, connectionListener?: () => void): Socket;
    function createConnection(path: string, connectionListener?: () => void): Socket;
    /**
     * Tests if input is an IP address. Returns `0` for invalid strings,
     * returns `4` for IP version 4 addresses, and returns `6` for IP version 6
     * addresses.
     * @since v0.3.0
     */
    function isIP(input: string): number;
    /**
     * Returns `true` if input is a version 4 IP address, otherwise returns `false`.
     * @since v0.3.0
     */
    function isIPv4(input: string): boolean;
    /**
     * Returns `true` if input is a version 6 IP address, otherwise returns `false`.
     * @since v0.3.0
     */
    function isIPv6(input: string): boolean;
    interface SocketAddressInitOptions {
        /**
         * The network address as either an IPv4 or IPv6 string.
         * @default 127.0.0.1
         */
        address?: string | undefined;
        /**
         * @default `'ipv4'`
         */
        family?: IPVersion | undefined;
        /**
         * An IPv6 flow-label used only if `family` is `'ipv6'`.
         * @default 0
         */
        flowlabel?: number | undefined;
        /**
         * An IP port.
         * @default 0
         */
        port?: number | undefined;
    }
    /**
     * @since v15.14.0, v14.18.0
     */
    class SocketAddress {
        constructor(options: SocketAddressInitOptions);
        /**
         * Either \`'ipv4'\` or \`'ipv6'\`.
         * @since v15.14.0, v14.18.0
         */
        readonly address: string;
        /**
         * Either \`'ipv4'\` or \`'ipv6'\`.
         * @since v15.14.0, v14.18.0
         */
        readonly family: IPVersion;
        /**
         * @since v15.14.0, v14.18.0
         */
        readonly port: number;
        /**
         * @since v15.14.0, v14.18.0
         */
        readonly flowlabel: number;
    }
}
declare module 'node:net' {
    export * from 'net';
}