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/**
* The `node:readline` module provides an interface for reading data from a [Readable](https://nodejs.org/docs/latest-v20.x/api/stream.html#readable-streams) stream
* (such as [`process.stdin`](https://nodejs.org/docs/latest-v20.x/api/process.html#processstdin)) one line at a time.
*
* To use the promise-based APIs:
*
* ```js
* import * as readline from 'node:readline/promises';
* ```
*
* To use the callback and sync APIs:
*
* ```js
* import * as readline from 'node:readline';
* ```
*
* The following simple example illustrates the basic use of the `node:readline` module.
*
* ```js
* import * as readline from 'node:readline/promises';
* import { stdin as input, stdout as output } from 'node:process';
*
* const rl = readline.createInterface({ input, output });
*
* const answer = await rl.question('What do you think of Node.js? ');
*
* console.log(`Thank you for your valuable feedback: ${answer}`);
*
* rl.close();
* ```
*
* Once this code is invoked, the Node.js application will not terminate until the `readline.Interface` is closed because the interface waits for data to be
* received on the `input` stream.
* @see [source](https://github.com/nodejs/node/blob/v20.13.1/lib/readline.js)
*/
declare module "readline" {
import { Abortable, EventEmitter } from "node:events";
import * as promises from "node:readline/promises";
export { promises };
export interface Key {
sequence?: string | undefined;
name?: string | undefined;
ctrl?: boolean | undefined;
meta?: boolean | undefined;
shift?: boolean | undefined;
}
/**
* Instances of the `readline.Interface` class are constructed using the `readline.createInterface()` method. Every instance is associated with a
* single `input` [Readable](https://nodejs.org/docs/latest-v20.x/api/stream.html#readable-streams) stream and a single `output` [Writable](https://nodejs.org/docs/latest-v20.x/api/stream.html#writable-streams) stream.
* The `output` stream is used to print prompts for user input that arrives on,
* and is read from, the `input` stream.
* @since v0.1.104
*/
export class Interface extends EventEmitter {
readonly terminal: boolean;
/**
* The current input data being processed by node.
*
* This can be used when collecting input from a TTY stream to retrieve the
* current value that has been processed thus far, prior to the `line` event
* being emitted. Once the `line` event has been emitted, this property will
* be an empty string.
*
* Be aware that modifying the value during the instance runtime may have
* unintended consequences if `rl.cursor` is not also controlled.
*
* **If not using a TTY stream for input, use the `'line'` event.**
*
* One possible use case would be as follows:
*
* ```js
* const values = ['lorem ipsum', 'dolor sit amet'];
* const rl = readline.createInterface(process.stdin);
* const showResults = debounce(() => {
* console.log(
* '\n',
* values.filter((val) => val.startsWith(rl.line)).join(' '),
* );
* }, 300);
* process.stdin.on('keypress', (c, k) => {
* showResults();
* });
* ```
* @since v0.1.98
*/
readonly line: string;
/**
* The cursor position relative to `rl.line`.
*
* This will track where the current cursor lands in the input string, when
* reading input from a TTY stream. The position of cursor determines the
* portion of the input string that will be modified as input is processed,
* as well as the column where the terminal caret will be rendered.
* @since v0.1.98
*/
readonly cursor: number;
/**
* NOTE: According to the documentation:
*
* > Instances of the `readline.Interface` class are constructed using the
* > `readline.createInterface()` method.
*
* @see https://nodejs.org/dist/latest-v20.x/docs/api/readline.html#class-interfaceconstructor
*/
protected constructor(
input: NodeJS.ReadableStream,
output?: NodeJS.WritableStream,
completer?: Completer | AsyncCompleter,
terminal?: boolean,
);
/**
* NOTE: According to the documentation:
*
* > Instances of the `readline.Interface` class are constructed using the
* > `readline.createInterface()` method.
*
* @see https://nodejs.org/dist/latest-v20.x/docs/api/readline.html#class-interfaceconstructor
*/
protected constructor(options: ReadLineOptions);
/**
* The `rl.getPrompt()` method returns the current prompt used by `rl.prompt()`.
* @since v15.3.0, v14.17.0
* @return the current prompt string
*/
getPrompt(): string;
/**
* The `rl.setPrompt()` method sets the prompt that will be written to `output` whenever `rl.prompt()` is called.
* @since v0.1.98
*/
setPrompt(prompt: string): void;
/**
* The `rl.prompt()` method writes the `Interface` instances configured`prompt` to a new line in `output` in order to provide a user with a new
* location at which to provide input.
*
* When called, `rl.prompt()` will resume the `input` stream if it has been
* paused.
*
* If the `Interface` was created with `output` set to `null` or `undefined` the prompt is not written.
* @since v0.1.98
* @param preserveCursor If `true`, prevents the cursor placement from being reset to `0`.
*/
prompt(preserveCursor?: boolean): void;
/**
* The `rl.question()` method displays the `query` by writing it to the `output`,
* waits for user input to be provided on `input`, then invokes the `callback` function passing the provided input as the first argument.
*
* When called, `rl.question()` will resume the `input` stream if it has been
* paused.
*
* If the `Interface` was created with `output` set to `null` or `undefined` the `query` is not written.
*
* The `callback` function passed to `rl.question()` does not follow the typical
* pattern of accepting an `Error` object or `null` as the first argument.
* The `callback` is called with the provided answer as the only argument.
*
* An error will be thrown if calling `rl.question()` after `rl.close()`.
*
* Example usage:
*
* ```js
* rl.question('What is your favorite food? ', (answer) => {
* console.log(`Oh, so your favorite food is ${answer}`);
* });
* ```
*
* Using an `AbortController` to cancel a question.
*
* ```js
* const ac = new AbortController();
* const signal = ac.signal;
*
* rl.question('What is your favorite food? ', { signal }, (answer) => {
* console.log(`Oh, so your favorite food is ${answer}`);
* });
*
* signal.addEventListener('abort', () => {
* console.log('The food question timed out');
* }, { once: true });
*
* setTimeout(() => ac.abort(), 10000);
* ```
* @since v0.3.3
* @param query A statement or query to write to `output`, prepended to the prompt.
* @param callback A callback function that is invoked with the user's input in response to the `query`.
*/
question(query: string, callback: (answer: string) => void): void;
question(query: string, options: Abortable, callback: (answer: string) => void): void;
/**
* The `rl.pause()` method pauses the `input` stream, allowing it to be resumed
* later if necessary.
*
* Calling `rl.pause()` does not immediately pause other events (including `'line'`) from being emitted by the `Interface` instance.
* @since v0.3.4
*/
pause(): this;
/**
* The `rl.resume()` method resumes the `input` stream if it has been paused.
* @since v0.3.4
*/
resume(): this;
/**
* The `rl.close()` method closes the `Interface` instance and
* relinquishes control over the `input` and `output` streams. When called,
* the `'close'` event will be emitted.
*
* Calling `rl.close()` does not immediately stop other events (including `'line'`)
* from being emitted by the `Interface` instance.
* @since v0.1.98
*/
close(): void;
/**
* The `rl.write()` method will write either `data` or a key sequence identified
* by `key` to the `output`. The `key` argument is supported only if `output` is
* a `TTY` text terminal. See `TTY keybindings` for a list of key
* combinations.
*
* If `key` is specified, `data` is ignored.
*
* When called, `rl.write()` will resume the `input` stream if it has been
* paused.
*
* If the `Interface` was created with `output` set to `null` or `undefined` the `data` and `key` are not written.
*
* ```js
* rl.write('Delete this!');
* // Simulate Ctrl+U to delete the line written previously
* rl.write(null, { ctrl: true, name: 'u' });
* ```
*
* The `rl.write()` method will write the data to the `readline` `Interface`'s `input` _as if it were provided by the user_.
* @since v0.1.98
*/
write(data: string | Buffer, key?: Key): void;
write(data: undefined | null | string | Buffer, key: Key): void;
/**
* Returns the real position of the cursor in relation to the input
* prompt + string. Long input (wrapping) strings, as well as multiple
* line prompts are included in the calculations.
* @since v13.5.0, v12.16.0
*/
getCursorPos(): CursorPos;
/**
* events.EventEmitter
* 1. close
* 2. line
* 3. pause
* 4. resume
* 5. SIGCONT
* 6. SIGINT
* 7. SIGTSTP
* 8. history
*/
addListener(event: string, listener: (...args: any[]) => void): this;
addListener(event: "close", listener: () => void): this;
addListener(event: "line", listener: (input: string) => void): this;
addListener(event: "pause", listener: () => void): this;
addListener(event: "resume", listener: () => void): this;
addListener(event: "SIGCONT", listener: () => void): this;
addListener(event: "SIGINT", listener: () => void): this;
addListener(event: "SIGTSTP", listener: () => void): this;
addListener(event: "history", listener: (history: string[]) => void): this;
emit(event: string | symbol, ...args: any[]): boolean;
emit(event: "close"): boolean;
emit(event: "line", input: string): boolean;
emit(event: "pause"): boolean;
emit(event: "resume"): boolean;
emit(event: "SIGCONT"): boolean;
emit(event: "SIGINT"): boolean;
emit(event: "SIGTSTP"): boolean;
emit(event: "history", history: string[]): boolean;
on(event: string, listener: (...args: any[]) => void): this;
on(event: "close", listener: () => void): this;
on(event: "line", listener: (input: string) => void): this;
on(event: "pause", listener: () => void): this;
on(event: "resume", listener: () => void): this;
on(event: "SIGCONT", listener: () => void): this;
on(event: "SIGINT", listener: () => void): this;
on(event: "SIGTSTP", listener: () => void): this;
on(event: "history", listener: (history: string[]) => void): this;
once(event: string, listener: (...args: any[]) => void): this;
once(event: "close", listener: () => void): this;
once(event: "line", listener: (input: string) => void): this;
once(event: "pause", listener: () => void): this;
once(event: "resume", listener: () => void): this;
once(event: "SIGCONT", listener: () => void): this;
once(event: "SIGINT", listener: () => void): this;
once(event: "SIGTSTP", listener: () => void): this;
once(event: "history", listener: (history: string[]) => void): this;
prependListener(event: string, listener: (...args: any[]) => void): this;
prependListener(event: "close", listener: () => void): this;
prependListener(event: "line", listener: (input: string) => void): this;
prependListener(event: "pause", listener: () => void): this;
prependListener(event: "resume", listener: () => void): this;
prependListener(event: "SIGCONT", listener: () => void): this;
prependListener(event: "SIGINT", listener: () => void): this;
prependListener(event: "SIGTSTP", listener: () => void): this;
prependListener(event: "history", listener: (history: string[]) => void): this;
prependOnceListener(event: string, listener: (...args: any[]) => void): this;
prependOnceListener(event: "close", listener: () => void): this;
prependOnceListener(event: "line", listener: (input: string) => void): this;
prependOnceListener(event: "pause", listener: () => void): this;
prependOnceListener(event: "resume", listener: () => void): this;
prependOnceListener(event: "SIGCONT", listener: () => void): this;
prependOnceListener(event: "SIGINT", listener: () => void): this;
prependOnceListener(event: "SIGTSTP", listener: () => void): this;
prependOnceListener(event: "history", listener: (history: string[]) => void): this;
[Symbol.asyncIterator](): AsyncIterableIterator<string>;
}
export type ReadLine = Interface; // type forwarded for backwards compatibility
export type Completer = (line: string) => CompleterResult;
export type AsyncCompleter = (
line: string,
callback: (err?: null | Error, result?: CompleterResult) => void,
) => void;
export type CompleterResult = [string[], string];
export interface ReadLineOptions {
input: NodeJS.ReadableStream;
output?: NodeJS.WritableStream | undefined;
completer?: Completer | AsyncCompleter | undefined;
terminal?: boolean | undefined;
/**
* Initial list of history lines. This option makes sense
* only if `terminal` is set to `true` by the user or by an internal `output`
* check, otherwise the history caching mechanism is not initialized at all.
* @default []
*/
history?: string[] | undefined;
historySize?: number | undefined;
prompt?: string | undefined;
crlfDelay?: number | undefined;
/**
* If `true`, when a new input line added
* to the history list duplicates an older one, this removes the older line
* from the list.
* @default false
*/
removeHistoryDuplicates?: boolean | undefined;
escapeCodeTimeout?: number | undefined;
tabSize?: number | undefined;
}
/**
* The `readline.createInterface()` method creates a new `readline.Interface` instance.
*
* ```js
* const readline = require('node:readline');
* const rl = readline.createInterface({
* input: process.stdin,
* output: process.stdout,
* });
* ```
*
* Once the `readline.Interface` instance is created, the most common case is to
* listen for the `'line'` event:
*
* ```js
* rl.on('line', (line) => {
* console.log(`Received: ${line}`);
* });
* ```
*
* If `terminal` is `true` for this instance then the `output` stream will get
* the best compatibility if it defines an `output.columns` property and emits
* a `'resize'` event on the `output` if or when the columns ever change
* (`process.stdout` does this automatically when it is a TTY).
*
* When creating a `readline.Interface` using `stdin` as input, the program
* will not terminate until it receives an [EOF character](https://en.wikipedia.org/wiki/End-of-file#EOF_character). To exit without
* waiting for user input, call `process.stdin.unref()`.
* @since v0.1.98
*/
export function createInterface(
input: NodeJS.ReadableStream,
output?: NodeJS.WritableStream,
completer?: Completer | AsyncCompleter,
terminal?: boolean,
): Interface;
export function createInterface(options: ReadLineOptions): Interface;
/**
* The `readline.emitKeypressEvents()` method causes the given `Readable` stream to begin emitting `'keypress'` events corresponding to received input.
*
* Optionally, `interface` specifies a `readline.Interface` instance for which
* autocompletion is disabled when copy-pasted input is detected.
*
* If the `stream` is a `TTY`, then it must be in raw mode.
*
* This is automatically called by any readline instance on its `input` if the `input` is a terminal. Closing the `readline` instance does not stop
* the `input` from emitting `'keypress'` events.
*
* ```js
* readline.emitKeypressEvents(process.stdin);
* if (process.stdin.isTTY)
* process.stdin.setRawMode(true);
* ```
*
* ## Example: Tiny CLI
*
* The following example illustrates the use of `readline.Interface` class to
* implement a small command-line interface:
*
* ```js
* const readline = require('node:readline');
* const rl = readline.createInterface({
* input: process.stdin,
* output: process.stdout,
* prompt: 'OHAI> ',
* });
*
* rl.prompt();
*
* rl.on('line', (line) => {
* switch (line.trim()) {
* case 'hello':
* console.log('world!');
* break;
* default:
* console.log(`Say what? I might have heard '${line.trim()}'`);
* break;
* }
* rl.prompt();
* }).on('close', () => {
* console.log('Have a great day!');
* process.exit(0);
* });
* ```
*
* ## Example: Read file stream line-by-Line
*
* A common use case for `readline` is to consume an input file one line at a
* time. The easiest way to do so is leveraging the `fs.ReadStream` API as
* well as a `for await...of` loop:
*
* ```js
* const fs = require('node:fs');
* const readline = require('node:readline');
*
* async function processLineByLine() {
* const fileStream = fs.createReadStream('input.txt');
*
* const rl = readline.createInterface({
* input: fileStream,
* crlfDelay: Infinity,
* });
* // Note: we use the crlfDelay option to recognize all instances of CR LF
* // ('\r\n') in input.txt as a single line break.
*
* for await (const line of rl) {
* // Each line in input.txt will be successively available here as `line`.
* console.log(`Line from file: ${line}`);
* }
* }
*
* processLineByLine();
* ```
*
* Alternatively, one could use the `'line'` event:
*
* ```js
* const fs = require('node:fs');
* const readline = require('node:readline');
*
* const rl = readline.createInterface({
* input: fs.createReadStream('sample.txt'),
* crlfDelay: Infinity,
* });
*
* rl.on('line', (line) => {
* console.log(`Line from file: ${line}`);
* });
* ```
*
* Currently, `for await...of` loop can be a bit slower. If `async` / `await` flow and speed are both essential, a mixed approach can be applied:
*
* ```js
* const { once } = require('node:events');
* const { createReadStream } = require('node:fs');
* const { createInterface } = require('node:readline');
*
* (async function processLineByLine() {
* try {
* const rl = createInterface({
* input: createReadStream('big-file.txt'),
* crlfDelay: Infinity,
* });
*
* rl.on('line', (line) => {
* // Process the line.
* });
*
* await once(rl, 'close');
*
* console.log('File processed.');
* } catch (err) {
* console.error(err);
* }
* })();
* ```
* @since v0.7.7
*/
export function emitKeypressEvents(stream: NodeJS.ReadableStream, readlineInterface?: Interface): void;
export type Direction = -1 | 0 | 1;
export interface CursorPos {
rows: number;
cols: number;
}
/**
* The `readline.clearLine()` method clears current line of given [TTY](https://nodejs.org/docs/latest-v20.x/api/tty.html) stream
* in a specified direction identified by `dir`.
* @since v0.7.7
* @param callback Invoked once the operation completes.
* @return `false` if `stream` wishes for the calling code to wait for the `'drain'` event to be emitted before continuing to write additional data; otherwise `true`.
*/
export function clearLine(stream: NodeJS.WritableStream, dir: Direction, callback?: () => void): boolean;
/**
* The `readline.clearScreenDown()` method clears the given [TTY](https://nodejs.org/docs/latest-v20.x/api/tty.html) stream from
* the current position of the cursor down.
* @since v0.7.7
* @param callback Invoked once the operation completes.
* @return `false` if `stream` wishes for the calling code to wait for the `'drain'` event to be emitted before continuing to write additional data; otherwise `true`.
*/
export function clearScreenDown(stream: NodeJS.WritableStream, callback?: () => void): boolean;
/**
* The `readline.cursorTo()` method moves cursor to the specified position in a
* given [TTY](https://nodejs.org/docs/latest-v20.x/api/tty.html) `stream`.
* @since v0.7.7
* @param callback Invoked once the operation completes.
* @return `false` if `stream` wishes for the calling code to wait for the `'drain'` event to be emitted before continuing to write additional data; otherwise `true`.
*/
export function cursorTo(stream: NodeJS.WritableStream, x: number, y?: number, callback?: () => void): boolean;
/**
* The `readline.moveCursor()` method moves the cursor _relative_ to its current
* position in a given [TTY](https://nodejs.org/docs/latest-v20.x/api/tty.html) `stream`.
* @since v0.7.7
* @param callback Invoked once the operation completes.
* @return `false` if `stream` wishes for the calling code to wait for the `'drain'` event to be emitted before continuing to write additional data; otherwise `true`.
*/
export function moveCursor(stream: NodeJS.WritableStream, dx: number, dy: number, callback?: () => void): boolean;
}
declare module "node:readline" {
export * from "readline";
}