/**
|
* The `readline` module provides an interface for reading data from a `Readable` stream (such as `process.stdin`) 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 `readline` module.
|
*
|
* ```js
|
* import * as readline from 'node:readline/promises';
|
* import { stdin as input, stdout as output } from '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/v17.0.0/lib/readline.js)
|
*/
|
declare module 'readline' {
|
import { Abortable, EventEmitter } from 'node:events';
|
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` stream and a single `output` `Writable` 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
|
*/
|
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-v10.x/docs/api/readline.html#readline_class_interface
|
*/
|
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-v10.x/docs/api/readline.html#readline_class_interface
|
*/
|
protected constructor(options: ReadLineOptions);
|
/**
|
* The `rl.getPrompt()` method returns the current prompt used by `rl.prompt()`.
|
* @since v15.3.0
|
* @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 `readline.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 `readline.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 `readline.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.
|
*
|
* 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);
|
* ```
|
*
|
* If this method is invoked as it's util.promisify()ed version, it returns a
|
* Promise that fulfills with the answer. If the question is canceled using
|
* an `AbortController` it will reject with an `AbortError`.
|
*
|
* ```js
|
* const util = require('util');
|
* const question = util.promisify(rl.question).bind(rl);
|
*
|
* async function questionExample() {
|
* try {
|
* const answer = await question('What is you favorite food? ');
|
* console.log(`Oh, so your favorite food is ${answer}`);
|
* } catch (err) {
|
* console.error('Question rejected', err);
|
* }
|
* }
|
* questionExample();
|
* ```
|
* @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 `readline.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 `readline.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 `readline.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 `readline.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>;
|
}
|
type ReadLine = Interface; // type forwarded for backwards compatibility
|
type Completer = (line: string) => CompleterResult;
|
type AsyncCompleter = (line: string, callback: (err?: null | Error, result?: CompleterResult) => void) => void;
|
type CompleterResult = [string[], string];
|
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('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 `EOF` (Ctrl+D on
|
* Linux/macOS, Ctrl+Z followed by Return on
|
* Windows).
|
* If you want your application to exit without waiting for user input, you can `unref()` the standard input stream:
|
*
|
* ```js
|
* process.stdin.unref();
|
* ```
|
* @since v0.1.98
|
*/
|
function createInterface(input: NodeJS.ReadableStream, output?: NodeJS.WritableStream, completer?: Completer | AsyncCompleter, terminal?: boolean): Interface;
|
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('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('fs');
|
* const readline = require('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('fs');
|
* const readline = require('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('events');
|
* const { createReadStream } = require('fs');
|
* const { createInterface } = require('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
|
*/
|
function emitKeypressEvents(stream: NodeJS.ReadableStream, readlineInterface?: Interface): void;
|
type Direction = -1 | 0 | 1;
|
interface CursorPos {
|
rows: number;
|
cols: number;
|
}
|
/**
|
* The `readline.clearLine()` method clears current line of given `TTY` 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`.
|
*/
|
function clearLine(stream: NodeJS.WritableStream, dir: Direction, callback?: () => void): boolean;
|
/**
|
* The `readline.clearScreenDown()` method clears the given `TTY` 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`.
|
*/
|
function clearScreenDown(stream: NodeJS.WritableStream, callback?: () => void): boolean;
|
/**
|
* The `readline.cursorTo()` method moves cursor to the specified position in a
|
* given `TTY` `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`.
|
*/
|
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` `stream`.
|
*
|
* ## Example: Tiny CLI
|
*
|
* The following example illustrates the use of `readline.Interface` class to
|
* implement a small command-line interface:
|
*
|
* ```js
|
* const readline = require('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('fs');
|
* const readline = require('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('fs');
|
* const readline = require('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('events');
|
* const { createReadStream } = require('fs');
|
* const { createInterface } = require('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
|
* @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`.
|
*/
|
function moveCursor(stream: NodeJS.WritableStream, dx: number, dy: number, callback?: () => void): boolean;
|
}
|
declare module 'node:readline' {
|
export * from 'readline';
|
}
|
