A tiny (364b) JavaScript utility for debouncing, throttling, and dynamic rate-limiting. Built for performance and simplicity, micro-flow helps developers optimize event-driven applications with minimal overhead.

Introduction

micro-flow is a lightweight library designed to handle rate-limiting tasks in JavaScript with ease. Whether you're optimizing scroll events, search inputs, or API calls, this package provides three core functions—debounce, throttle, and dynamic—to ensure your code runs efficiently. With a focus on modern JavaScript, TypeScript support, and a tiny footprint, micro-flow is perfect for projects where performance and bundle size matter.

Why I Built This Package

As a developer, I noticed that many rate-limiting libraries were either bloated with dependencies or lacked flexibility for modern workflows. I wanted to create a solution that was:

• Ultra-lightweight: At under 500 bytes, it adds negligible weight to your bundle.
• Modern: Built with ES Modules and TypeScript for seamless integration in contemporary projects.
• Unique: The dynamic function adapts wait times based on call frequency, a feature not commonly found in other libraries.
• Simple: Clear APIs and zero dependencies make it easy to adopt and maintain.

This package was also a way for me to deepen my understanding of JavaScript performance patterns while contributing a practical tool to the open-source community. It’s a showcase of clean code, rigorous testing, and developer-friendly design.

How It Differs from Other Packages

While there are other debounce and throttle libraries like lodash.debounce, throttle-debounce, or just-debounce-it, @abuhasanrumi/micro-flow stands out in several ways:

• Smaller Size: Most alternatives range from 1-70KB (e.g., Lodash is ~70KB). micro-flow is under 364b minified, ideal for performance-critical apps.
• Dynamic Mode: Unlike traditional debounce or throttle, the dynamic function adjusts wait times based on how frequently it’s called, offering smarter rate-limiting for variable workloads (e.g., search inputs with bursts of typing).
• TypeScript-First: Built with TypeScript definitions included, ensuring a great developer experience without extra setup.
• No Dependencies: Unlike some libraries that pull in large utilities, micro-flow is standalone, reducing bloat and security risks.
• Modern JavaScript: Uses ES Modules and is tree-shakable, unlike older libraries with CommonJS or UMD formats.
• Focused Scope: Instead of being a kitchen-sink utility, it does three things well, keeping your project lean.

If you need a minimal, flexible, and forward-thinking rate-limiting solution, micro-flow is designed for you.

Installation

Install via npm:

npm install @abuhasanrumi/micro-flow

Usage

Debounce

Prevents a function from running until a specified delay has passed since its last call. Great for search inputs or resize events.

import { debounce } from '@abuhasanrumi/micro-flow';

const log = debounce(() => console.log('Debounced!'), 200);
window.addEventListener('resize', log);
// Rapid resizes trigger only one console.log after 200ms

Throttle

Limits a function to run at most once every specified interval. Perfect for scroll or mouse-move events.

import { throttle } from '@abuhasanrumi/micro-flow';

const update = throttle(() => console.log('Throttled!'), 100);
window.addEventListener('scroll', update);
// Logs at most once every 100ms during scrolling

Dynamic

Adapts the wait time based on call frequency, using a base wait and scaling up to a maximum. Ideal for dynamic inputs like typing or IoT events.

import { dynamic } from '@abuhasanrumi/micro-flow';

const search = dynamic(() => console.log('Searching...'), { baseWait: 200, maxWait: 1000 });
document.getElementById('search').addEventListener('input', search);
// Frequent typing uses ~200ms wait; sparse typing extends up to 1000ms

Features

• Ultra-Tiny: 364 bytes minified, ensuring minimal impact on bundle size.
• TypeScript Support: Full type definitions for better IDE integration.
• Dynamic Rate-Limiting: Unique dynamic function adjusts wait times for smarter performance.
• Zero Dependencies: No external libraries, reducing complexity and risks.
• Tree-Shakable: ES Modules ensure only used functions are bundled.
• 100% Test Coverage: Rigorous tests with Vitest for reliability.
• Modern Workflow: Built for Node.js 18+ and compatible with frameworks like React, Vue, or Svelte.

Live Demo

Try @abuhasanrumi/micro-flow in action:

Live Demo on CodeSandbox

See debounce on a search input, throttle on scroll events, and dynamic with adaptive typing—all in a simple, interactive example.

API Reference

debounce(fn, wait)

• fn: Function to debounce.
• wait: Delay in milliseconds.
• Returns: Debounced function that runs fn after wait ms of inactivity.

throttle(fn, wait)

• fn: Function to throttle.
• wait: Minimum interval in milliseconds.
• Returns: Throttled function that runs fn at most once per wait ms.

dynamic(fn, options)

• fn: Function to rate-limit.
• options:
  • baseWait: Minimum wait time in milliseconds (e.g., 200).
  • maxWait: Maximum wait time in milliseconds (e.g., 1000).
• Returns: Function that schedules fn with a wait time that adapts based on call frequency.

Development

To contribute or run locally:

1. Clone the repo:

   git clone https://github.com/abuhasanrumi/micro-flow.git
   cd micro-flow

2. Install dependencies:

   npm install

3. Run tests:

   npm test

4. Build the package:

   npm run build

License

Copyright (c) 2025 Abu Hasan Rumi

Acknowledgments

Built as a learning project to explore JavaScript performance patterns and contribute to the open-source community. Feedback and contributions are welcome!