emit-keypress

Drop-dead simple keypress event emitter for Node.js. Create powerful CLI applications and experiences with ease.

Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your :heart: and support.

Install

Install with npm:

$ npm install --save emit-keypress

Usage

import { emitKeypress } from 'emit-keypress';

emitKeypress({ input: process.stdin });

process.stdin.on('keypress', (input, key) => {
  console.log({ input, key });

  if (input === '\x03' || input === '\r') {
    process.stdin.pause();
  }
});

API

onKeypress

Pass an onKeypress function to emitKeypress to handle keypress events.

// The "close" function is passed as the third argument
const onKeypress = async (input, key, close) => {
  // do stuff with keypress events
  console.log({ input, key });

  // Close the stream if the user presses `Ctrl+C` or `Enter`
  if (input === '\x03' || input === '\r') {
    close();
  }
};

emitKeypress({ onKeypress });

A close function is also returned from emitKeypress that can be called to close the stream.

const { close } = emitKeypress({ onKeypress });

// close the stream
setTimeout(() => {
  close();
}, 10_000);

keymap

Pass a keymap array to map keypress events to specific shortcuts.

emitKeypress({
  keymap: [
    { sequence: '\x03', shortcut: 'ctrl+c' },
    { sequence: '\r', shortcut: 'return' }
  ],
  onKeypress: async (input, key, close) => {
    // do stuff with keypress events
    console.log({ input, key });

    if (key.shortcut === 'return' || key.shortcut === 'ctrl+c') {
      close();
    }
  }
});

input

Pass a ReadableStream to input to listen for keypress events on the stream.

emitKeypress({
  input: process.stdin,
  onKeypress: async (input, key, close) => {
    // do stuff with keypress events
    console.log({ input, key });

    if (key.shortcut === 'return' || key.shortcut === 'ctrl+c') {
      close();
    }
  }
});

About

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

$ npm install && npm test

(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

Author

Jon Schlinkert

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License

Copyright © 2024, Jon Schlinkert. Released under the MIT License.

This file was generated by verb-generate-readme, v0.8.0, on July 24, 2024.