LiteDebounce

A lightweight, dependency-free debounce utility for JavaScript functions. Supports both leading and trailing edge execution. Perfect for input handlers, resize events, and performance optimization in modern web apps.

View Demo • View on GitHub

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Features

• Zero dependencies
• ESM build
• Leading/trailing edge debounce
• Context (this) support
• Tiny & fast

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Installation

npm install lite-debounce-js

Or simply copy the file from dist/ into your project.

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Usage

Import

// ESM (from npm)
import { LiteDebounce } from 'lite-debounce-js';
// Or import from local build:
import { LiteDebounce } from './dist/lite-debounce.min.js';

Basic trailing debounce (default)

const debouncer = new LiteDebounce(() => {
  console.log('Debounced!');
}, 300); // 300ms delay

window.addEventListener('resize', debouncer.fnDebounced);

Leading debounce

const debouncer = new LiteDebounce(() => {
  console.log('Leading call!');
}, 500, { leading: true });

const debouncedFn = debouncer.fnDebounced;
debouncedFn(); // will be called immediately

With arguments and context

const obj = {
  value: 42,
  log() {
    console.log(this.value);
  }
};
const debouncer = new LiteDebounce(obj.log, 200);
const debouncedFn = debouncer.fnDebounced.bind(obj);
debouncedFn(); // logs: 42

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API

new LiteDebounce(fn, delay = 300, options = {})

• fn — function to debounce
• delay — debounce delay in ms (default: 300)
• options.leading — if true, call on the leading edge (default: false)

Instance property:

• .fnDebounced — debounced function, use it in event listeners or anywhere

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Demo

Open demo/index.html in your browser (with a local server) or run the dev server:

npm run dev

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Testing

npm test

Tests are written with Vitest.