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545 lines
26 KiB
545 lines
26 KiB
/** |
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* The `dgram` module provides an implementation of UDP datagram sockets. |
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* |
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* ```js |
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* import dgram from 'dgram'; |
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* |
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* const server = dgram.createSocket('udp4'); |
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* |
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* server.on('error', (err) => { |
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* console.log(`server error:\n${err.stack}`); |
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* server.close(); |
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* }); |
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* |
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* server.on('message', (msg, rinfo) => { |
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* console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`); |
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* }); |
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* |
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* server.on('listening', () => { |
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* const address = server.address(); |
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* console.log(`server listening ${address.address}:${address.port}`); |
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* }); |
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* |
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* server.bind(41234); |
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* // Prints: server listening 0.0.0.0:41234 |
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* ``` |
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* @see [source](https://github.com/nodejs/node/blob/v17.0.0/lib/dgram.js) |
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*/ |
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declare module 'dgram' { |
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import { AddressInfo } from 'node:net'; |
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import * as dns from 'node:dns'; |
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import { EventEmitter, Abortable } from 'node:events'; |
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interface RemoteInfo { |
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address: string; |
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family: 'IPv4' | 'IPv6'; |
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port: number; |
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size: number; |
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} |
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interface BindOptions { |
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port?: number | undefined; |
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address?: string | undefined; |
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exclusive?: boolean | undefined; |
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fd?: number | undefined; |
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} |
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type SocketType = 'udp4' | 'udp6'; |
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interface SocketOptions extends Abortable { |
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type: SocketType; |
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reuseAddr?: boolean | undefined; |
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/** |
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* @default false |
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*/ |
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ipv6Only?: boolean | undefined; |
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recvBufferSize?: number | undefined; |
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sendBufferSize?: number | undefined; |
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lookup?: ((hostname: string, options: dns.LookupOneOptions, callback: (err: NodeJS.ErrnoException | null, address: string, family: number) => void) => void) | undefined; |
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} |
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/** |
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* Creates a `dgram.Socket` object. Once the socket is created, calling `socket.bind()` will instruct the socket to begin listening for datagram |
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* messages. When `address` and `port` are not passed to `socket.bind()` the |
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* method will bind the socket to the "all interfaces" address on a random port |
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* (it does the right thing for both `udp4` and `udp6` sockets). The bound address |
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* and port can be retrieved using `socket.address().address` and `socket.address().port`. |
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* |
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* If the `signal` option is enabled, calling `.abort()` on the corresponding`AbortController` is similar to calling `.close()` on the socket: |
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* |
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* ```js |
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* const controller = new AbortController(); |
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* const { signal } = controller; |
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* const server = dgram.createSocket({ type: 'udp4', signal }); |
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* server.on('message', (msg, rinfo) => { |
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* console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`); |
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* }); |
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* // Later, when you want to close the server. |
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* controller.abort(); |
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* ``` |
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* @since v0.11.13 |
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* @param options Available options are: |
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* @param callback Attached as a listener for `'message'` events. Optional. |
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*/ |
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function createSocket(type: SocketType, callback?: (msg: Buffer, rinfo: RemoteInfo) => void): Socket; |
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function createSocket(options: SocketOptions, callback?: (msg: Buffer, rinfo: RemoteInfo) => void): Socket; |
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/** |
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* Encapsulates the datagram functionality. |
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* |
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* New instances of `dgram.Socket` are created using {@link createSocket}. |
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* The `new` keyword is not to be used to create `dgram.Socket` instances. |
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* @since v0.1.99 |
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*/ |
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class Socket extends EventEmitter { |
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/** |
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* Tells the kernel to join a multicast group at the given `multicastAddress` and`multicastInterface` using the `IP_ADD_MEMBERSHIP` socket option. If the`multicastInterface` argument is not |
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* specified, the operating system will choose |
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* one interface and will add membership to it. To add membership to every |
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* available interface, call `addMembership` multiple times, once per interface. |
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* |
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* When called on an unbound socket, this method will implicitly bind to a random |
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* port, listening on all interfaces. |
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* |
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* When sharing a UDP socket across multiple `cluster` workers, the`socket.addMembership()` function must be called only once or an`EADDRINUSE` error will occur: |
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* |
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* ```js |
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* import cluster from 'cluster'; |
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* import dgram from 'dgram'; |
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* |
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* if (cluster.isPrimary) { |
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* cluster.fork(); // Works ok. |
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* cluster.fork(); // Fails with EADDRINUSE. |
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* } else { |
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* const s = dgram.createSocket('udp4'); |
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* s.bind(1234, () => { |
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* s.addMembership('224.0.0.114'); |
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* }); |
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* } |
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* ``` |
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* @since v0.6.9 |
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*/ |
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addMembership(multicastAddress: string, multicastInterface?: string): void; |
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/** |
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* Returns an object containing the address information for a socket. |
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* For UDP sockets, this object will contain `address`, `family` and `port`properties. |
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* |
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* This method throws `EBADF` if called on an unbound socket. |
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* @since v0.1.99 |
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*/ |
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address(): AddressInfo; |
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/** |
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* For UDP sockets, causes the `dgram.Socket` to listen for datagram |
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* messages on a named `port` and optional `address`. If `port` is not |
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* specified or is `0`, the operating system will attempt to bind to a |
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* random port. If `address` is not specified, the operating system will |
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* attempt to listen on all addresses. Once binding is complete, a`'listening'` event is emitted and the optional `callback` function is |
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* called. |
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* |
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* Specifying both a `'listening'` event listener and passing a`callback` to the `socket.bind()` method is not harmful but not very |
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* useful. |
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* |
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* A bound datagram socket keeps the Node.js process running to receive |
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* datagram messages. |
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* |
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* If binding fails, an `'error'` event is generated. In rare case (e.g. |
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* attempting to bind with a closed socket), an `Error` may be thrown. |
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* |
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* Example of a UDP server listening on port 41234: |
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* |
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* ```js |
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* import dgram from 'dgram'; |
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* |
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* const server = dgram.createSocket('udp4'); |
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* |
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* server.on('error', (err) => { |
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* console.log(`server error:\n${err.stack}`); |
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* server.close(); |
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* }); |
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* |
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* server.on('message', (msg, rinfo) => { |
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* console.log(`server got: ${msg} from ${rinfo.address}:${rinfo.port}`); |
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* }); |
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* |
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* server.on('listening', () => { |
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* const address = server.address(); |
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* console.log(`server listening ${address.address}:${address.port}`); |
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* }); |
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* |
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* server.bind(41234); |
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* // Prints: server listening 0.0.0.0:41234 |
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* ``` |
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* @since v0.1.99 |
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* @param callback with no parameters. Called when binding is complete. |
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*/ |
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bind(port?: number, address?: string, callback?: () => void): this; |
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bind(port?: number, callback?: () => void): this; |
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bind(callback?: () => void): this; |
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bind(options: BindOptions, callback?: () => void): this; |
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/** |
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* Close the underlying socket and stop listening for data on it. If a callback is |
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* provided, it is added as a listener for the `'close'` event. |
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* @since v0.1.99 |
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* @param callback Called when the socket has been closed. |
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*/ |
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close(callback?: () => void): this; |
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/** |
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* Associates the `dgram.Socket` to a remote address and port. Every |
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* message sent by this handle is automatically sent to that destination. Also, |
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* the socket will only receive messages from that remote peer. |
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* Trying to call `connect()` on an already connected socket will result |
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* in an `ERR_SOCKET_DGRAM_IS_CONNECTED` exception. If `address` is not |
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* provided, `'127.0.0.1'` (for `udp4` sockets) or `'::1'` (for `udp6` sockets) |
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* will be used by default. Once the connection is complete, a `'connect'` event |
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* is emitted and the optional `callback` function is called. In case of failure, |
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* the `callback` is called or, failing this, an `'error'` event is emitted. |
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* @since v12.0.0 |
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* @param callback Called when the connection is completed or on error. |
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*/ |
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connect(port: number, address?: string, callback?: () => void): void; |
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connect(port: number, callback: () => void): void; |
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/** |
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* A synchronous function that disassociates a connected `dgram.Socket` from |
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* its remote address. Trying to call `disconnect()` on an unbound or already |
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* disconnected socket will result in an `ERR_SOCKET_DGRAM_NOT_CONNECTED` exception. |
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* @since v12.0.0 |
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*/ |
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disconnect(): void; |
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/** |
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* Instructs the kernel to leave a multicast group at `multicastAddress` using the`IP_DROP_MEMBERSHIP` socket option. This method is automatically called by the |
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* kernel when the socket is closed or the process terminates, so most apps will |
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* never have reason to call this. |
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* |
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* If `multicastInterface` is not specified, the operating system will attempt to |
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* drop membership on all valid interfaces. |
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* @since v0.6.9 |
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*/ |
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dropMembership(multicastAddress: string, multicastInterface?: string): void; |
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/** |
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* This method throws `ERR_SOCKET_BUFFER_SIZE` if called on an unbound socket. |
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* @since v8.7.0 |
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* @return the `SO_RCVBUF` socket receive buffer size in bytes. |
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*/ |
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getRecvBufferSize(): number; |
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/** |
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* This method throws `ERR_SOCKET_BUFFER_SIZE` if called on an unbound socket. |
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* @since v8.7.0 |
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* @return the `SO_SNDBUF` socket send buffer size in bytes. |
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*/ |
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getSendBufferSize(): number; |
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/** |
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* By default, binding a socket will cause it to block the Node.js process from |
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* exiting as long as the socket is open. The `socket.unref()` method can be used |
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* to exclude the socket from the reference counting that keeps the Node.js |
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* process active. The `socket.ref()` method adds the socket back to the reference |
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* counting and restores the default behavior. |
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* |
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* Calling `socket.ref()` multiples times will have no additional effect. |
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* |
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* The `socket.ref()` method returns a reference to the socket so calls can be |
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* chained. |
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* @since v0.9.1 |
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*/ |
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ref(): this; |
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/** |
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* Returns an object containing the `address`, `family`, and `port` of the remote |
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* endpoint. This method throws an `ERR_SOCKET_DGRAM_NOT_CONNECTED` exception |
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* if the socket is not connected. |
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* @since v12.0.0 |
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*/ |
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remoteAddress(): AddressInfo; |
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/** |
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* Broadcasts a datagram on the socket. |
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* For connectionless sockets, the destination `port` and `address` must be |
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* specified. Connected sockets, on the other hand, will use their associated |
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* remote endpoint, so the `port` and `address` arguments must not be set. |
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* |
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* The `msg` argument contains the message to be sent. |
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* Depending on its type, different behavior can apply. If `msg` is a `Buffer`, |
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* any `TypedArray` or a `DataView`, |
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* the `offset` and `length` specify the offset within the `Buffer` where the |
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* message begins and the number of bytes in the message, respectively. |
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* If `msg` is a `String`, then it is automatically converted to a `Buffer`with `'utf8'` encoding. With messages that |
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* contain multi-byte characters, `offset` and `length` will be calculated with |
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* respect to `byte length` and not the character position. |
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* If `msg` is an array, `offset` and `length` must not be specified. |
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* |
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* The `address` argument is a string. If the value of `address` is a host name, |
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* DNS will be used to resolve the address of the host. If `address` is not |
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* provided or otherwise nullish, `'127.0.0.1'` (for `udp4` sockets) or `'::1'`(for `udp6` sockets) will be used by default. |
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* |
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* If the socket has not been previously bound with a call to `bind`, the socket |
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* is assigned a random port number and is bound to the "all interfaces" address |
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* (`'0.0.0.0'` for `udp4` sockets, `'::0'` for `udp6` sockets.) |
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* |
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* An optional `callback` function may be specified to as a way of reporting |
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* DNS errors or for determining when it is safe to reuse the `buf` object. |
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* DNS lookups delay the time to send for at least one tick of the |
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* Node.js event loop. |
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* |
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* The only way to know for sure that the datagram has been sent is by using a`callback`. If an error occurs and a `callback` is given, the error will be |
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* passed as the first argument to the `callback`. If a `callback` is not given, |
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* the error is emitted as an `'error'` event on the `socket` object. |
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* |
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* Offset and length are optional but both _must_ be set if either are used. |
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* They are supported only when the first argument is a `Buffer`, a `TypedArray`, |
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* or a `DataView`. |
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* |
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* This method throws `ERR_SOCKET_BAD_PORT` if called on an unbound socket. |
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* |
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* Example of sending a UDP packet to a port on `localhost`; |
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* |
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* ```js |
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* import dgram from 'dgram'; |
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* import { Buffer } from 'buffer'; |
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* |
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* const message = Buffer.from('Some bytes'); |
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* const client = dgram.createSocket('udp4'); |
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* client.send(message, 41234, 'localhost', (err) => { |
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* client.close(); |
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* }); |
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* ``` |
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* |
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* Example of sending a UDP packet composed of multiple buffers to a port on`127.0.0.1`; |
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* |
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* ```js |
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* import dgram from 'dgram'; |
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* import { Buffer } from 'buffer'; |
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* |
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* const buf1 = Buffer.from('Some '); |
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* const buf2 = Buffer.from('bytes'); |
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* const client = dgram.createSocket('udp4'); |
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* client.send([buf1, buf2], 41234, (err) => { |
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* client.close(); |
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* }); |
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* ``` |
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* |
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* Sending multiple buffers might be faster or slower depending on the |
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* application and operating system. Run benchmarks to |
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* determine the optimal strategy on a case-by-case basis. Generally speaking, |
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* however, sending multiple buffers is faster. |
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* |
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* Example of sending a UDP packet using a socket connected to a port on`localhost`: |
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* |
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* ```js |
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* import dgram from 'dgram'; |
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* import { Buffer } from 'buffer'; |
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* |
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* const message = Buffer.from('Some bytes'); |
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* const client = dgram.createSocket('udp4'); |
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* client.connect(41234, 'localhost', (err) => { |
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* client.send(message, (err) => { |
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* client.close(); |
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* }); |
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* }); |
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* ``` |
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* @since v0.1.99 |
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* @param msg Message to be sent. |
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* @param offset Offset in the buffer where the message starts. |
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* @param length Number of bytes in the message. |
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* @param port Destination port. |
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* @param address Destination host name or IP address. |
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* @param callback Called when the message has been sent. |
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*/ |
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send(msg: string | Uint8Array | ReadonlyArray<any>, port?: number, address?: string, callback?: (error: Error | null, bytes: number) => void): void; |
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send(msg: string | Uint8Array | ReadonlyArray<any>, port?: number, callback?: (error: Error | null, bytes: number) => void): void; |
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send(msg: string | Uint8Array | ReadonlyArray<any>, callback?: (error: Error | null, bytes: number) => void): void; |
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send(msg: string | Uint8Array, offset: number, length: number, port?: number, address?: string, callback?: (error: Error | null, bytes: number) => void): void; |
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send(msg: string | Uint8Array, offset: number, length: number, port?: number, callback?: (error: Error | null, bytes: number) => void): void; |
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send(msg: string | Uint8Array, offset: number, length: number, callback?: (error: Error | null, bytes: number) => void): void; |
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/** |
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* Sets or clears the `SO_BROADCAST` socket option. When set to `true`, UDP |
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* packets may be sent to a local interface's broadcast address. |
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* |
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* This method throws `EBADF` if called on an unbound socket. |
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* @since v0.6.9 |
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*/ |
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setBroadcast(flag: boolean): void; |
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/** |
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* _All references to scope in this section are referring to [IPv6 Zone Indices](https://en.wikipedia.org/wiki/IPv6_address#Scoped_literal_IPv6_addresses), which are defined by [RFC |
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* 4007](https://tools.ietf.org/html/rfc4007). In string form, an IP_ |
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* _with a scope index is written as `'IP%scope'` where scope is an interface name_ |
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* _or interface number._ |
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* |
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* Sets the default outgoing multicast interface of the socket to a chosen |
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* interface or back to system interface selection. The `multicastInterface` must |
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* be a valid string representation of an IP from the socket's family. |
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* |
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* For IPv4 sockets, this should be the IP configured for the desired physical |
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* interface. All packets sent to multicast on the socket will be sent on the |
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* interface determined by the most recent successful use of this call. |
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* |
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* For IPv6 sockets, `multicastInterface` should include a scope to indicate the |
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* interface as in the examples that follow. In IPv6, individual `send` calls can |
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* also use explicit scope in addresses, so only packets sent to a multicast |
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* address without specifying an explicit scope are affected by the most recent |
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* successful use of this call. |
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* |
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* This method throws `EBADF` if called on an unbound socket. |
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* |
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* #### Example: IPv6 outgoing multicast interface |
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* |
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* On most systems, where scope format uses the interface name: |
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* |
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* ```js |
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* const socket = dgram.createSocket('udp6'); |
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* |
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* socket.bind(1234, () => { |
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* socket.setMulticastInterface('::%eth1'); |
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* }); |
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* ``` |
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* |
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* On Windows, where scope format uses an interface number: |
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* |
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* ```js |
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* const socket = dgram.createSocket('udp6'); |
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* |
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* socket.bind(1234, () => { |
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* socket.setMulticastInterface('::%2'); |
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* }); |
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* ``` |
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* |
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* #### Example: IPv4 outgoing multicast interface |
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* |
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* All systems use an IP of the host on the desired physical interface: |
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* |
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* ```js |
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* const socket = dgram.createSocket('udp4'); |
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* |
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* socket.bind(1234, () => { |
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* socket.setMulticastInterface('10.0.0.2'); |
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* }); |
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* ``` |
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* @since v8.6.0 |
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*/ |
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setMulticastInterface(multicastInterface: string): void; |
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/** |
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* Sets or clears the `IP_MULTICAST_LOOP` socket option. When set to `true`, |
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* multicast packets will also be received on the local interface. |
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* |
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* This method throws `EBADF` if called on an unbound socket. |
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* @since v0.3.8 |
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*/ |
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setMulticastLoopback(flag: boolean): boolean; |
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/** |
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* Sets the `IP_MULTICAST_TTL` socket option. While TTL generally stands for |
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* "Time to Live", in this context it specifies the number of IP hops that a |
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* packet is allowed to travel through, specifically for multicast traffic. Each |
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* router or gateway that forwards a packet decrements the TTL. If the TTL is |
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* decremented to 0 by a router, it will not be forwarded. |
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* |
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* The `ttl` argument may be between 0 and 255\. The default on most systems is `1`. |
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* |
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* This method throws `EBADF` if called on an unbound socket. |
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* @since v0.3.8 |
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*/ |
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setMulticastTTL(ttl: number): number; |
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/** |
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* Sets the `SO_RCVBUF` socket option. Sets the maximum socket receive buffer |
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* in bytes. |
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* |
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* This method throws `ERR_SOCKET_BUFFER_SIZE` if called on an unbound socket. |
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* @since v8.7.0 |
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*/ |
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setRecvBufferSize(size: number): void; |
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/** |
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* Sets the `SO_SNDBUF` socket option. Sets the maximum socket send buffer |
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* in bytes. |
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* |
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* This method throws `ERR_SOCKET_BUFFER_SIZE` if called on an unbound socket. |
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* @since v8.7.0 |
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*/ |
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setSendBufferSize(size: number): void; |
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/** |
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* Sets the `IP_TTL` socket option. While TTL generally stands for "Time to Live", |
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* in this context it specifies the number of IP hops that a packet is allowed to |
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* travel through. Each router or gateway that forwards a packet decrements the |
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* TTL. If the TTL is decremented to 0 by a router, it will not be forwarded. |
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* Changing TTL values is typically done for network probes or when multicasting. |
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* |
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* The `ttl` argument may be between between 1 and 255\. The default on most systems |
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* is 64. |
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* |
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* This method throws `EBADF` if called on an unbound socket. |
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* @since v0.1.101 |
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*/ |
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setTTL(ttl: number): number; |
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/** |
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* By default, binding a socket will cause it to block the Node.js process from |
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* exiting as long as the socket is open. The `socket.unref()` method can be used |
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* to exclude the socket from the reference counting that keeps the Node.js |
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* process active, allowing the process to exit even if the socket is still |
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* listening. |
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* |
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* Calling `socket.unref()` multiple times will have no addition effect. |
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* |
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* The `socket.unref()` method returns a reference to the socket so calls can be |
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* chained. |
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* @since v0.9.1 |
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*/ |
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unref(): this; |
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/** |
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* Tells the kernel to join a source-specific multicast channel at the given`sourceAddress` and `groupAddress`, using the `multicastInterface` with the`IP_ADD_SOURCE_MEMBERSHIP` socket |
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* option. If the `multicastInterface` argument |
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* is not specified, the operating system will choose one interface and will add |
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* membership to it. To add membership to every available interface, call`socket.addSourceSpecificMembership()` multiple times, once per interface. |
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* |
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* When called on an unbound socket, this method will implicitly bind to a random |
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* port, listening on all interfaces. |
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* @since v13.1.0, v12.16.0 |
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*/ |
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addSourceSpecificMembership(sourceAddress: string, groupAddress: string, multicastInterface?: string): void; |
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/** |
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* Instructs the kernel to leave a source-specific multicast channel at the given`sourceAddress` and `groupAddress` using the `IP_DROP_SOURCE_MEMBERSHIP`socket option. This method is |
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* automatically called by the kernel when the |
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* socket is closed or the process terminates, so most apps will never have |
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* reason to call this. |
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* |
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* If `multicastInterface` is not specified, the operating system will attempt to |
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* drop membership on all valid interfaces. |
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* @since v13.1.0, v12.16.0 |
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*/ |
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dropSourceSpecificMembership(sourceAddress: string, groupAddress: string, multicastInterface?: string): void; |
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/** |
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* events.EventEmitter |
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* 1. close |
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* 2. connect |
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* 3. error |
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* 4. listening |
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* 5. message |
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*/ |
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addListener(event: string, listener: (...args: any[]) => void): this; |
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addListener(event: 'close', listener: () => void): this; |
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addListener(event: 'connect', listener: () => void): this; |
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addListener(event: 'error', listener: (err: Error) => void): this; |
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addListener(event: 'listening', listener: () => void): this; |
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addListener(event: 'message', listener: (msg: Buffer, rinfo: RemoteInfo) => void): this; |
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emit(event: string | symbol, ...args: any[]): boolean; |
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emit(event: 'close'): boolean; |
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emit(event: 'connect'): boolean; |
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emit(event: 'error', err: Error): boolean; |
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emit(event: 'listening'): boolean; |
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emit(event: 'message', msg: Buffer, rinfo: RemoteInfo): boolean; |
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on(event: string, listener: (...args: any[]) => void): this; |
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on(event: 'close', listener: () => void): this; |
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on(event: 'connect', listener: () => void): this; |
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on(event: 'error', listener: (err: Error) => void): this; |
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on(event: 'listening', listener: () => void): this; |
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on(event: 'message', listener: (msg: Buffer, rinfo: RemoteInfo) => void): this; |
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once(event: string, listener: (...args: any[]) => void): this; |
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once(event: 'close', listener: () => void): this; |
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once(event: 'connect', listener: () => void): this; |
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once(event: 'error', listener: (err: Error) => void): this; |
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once(event: 'listening', listener: () => void): this; |
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once(event: 'message', listener: (msg: Buffer, rinfo: RemoteInfo) => void): this; |
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prependListener(event: string, listener: (...args: any[]) => void): this; |
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prependListener(event: 'close', listener: () => void): this; |
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prependListener(event: 'connect', listener: () => void): this; |
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prependListener(event: 'error', listener: (err: Error) => void): this; |
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prependListener(event: 'listening', listener: () => void): this; |
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prependListener(event: 'message', listener: (msg: Buffer, rinfo: RemoteInfo) => void): this; |
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prependOnceListener(event: string, listener: (...args: any[]) => void): this; |
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prependOnceListener(event: 'close', listener: () => void): this; |
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prependOnceListener(event: 'connect', listener: () => void): this; |
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prependOnceListener(event: 'error', listener: (err: Error) => void): this; |
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prependOnceListener(event: 'listening', listener: () => void): this; |
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prependOnceListener(event: 'message', listener: (msg: Buffer, rinfo: RemoteInfo) => void): this; |
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} |
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} |
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declare module 'node:dgram' { |
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export * from 'dgram'; |
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}
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