# react-sub-unsub
> Manage React effect listeners with ease.
Latest version **2.2.8** (published 2025-02-18) · MIT license · 0 weekly downloads
## Install
```sh
npm install react-sub-unsub
pnpm add react-sub-unsub
yarn add react-sub-unsub
bun add react-sub-unsub
```
## Health
**Score 35/100 (D)** — status: maintenance-mode.
Positive: has types; no vulnerabilities; high quality score.
Warnings: low downloads; no esm support.
Negative: stale; low maintenance score.
## Facts
| | |
|---|---|
| Version | 2.2.8 |
| Published | 2025-02-18 |
| First published | 2022-12-26 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | bundled |
| Module format | CommonJS |
| Dependencies | 0 |
| Unpacked size | 35.8 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Author | Justin Mahar |
| Maintainers | justinmahar |
| Keywords | subscribe, unsubscribe, node, event, events, subscription, subscriptions, listener, listeners, timeout, timer, interval, setTimeout, setInterval |
## Links
- npm: https://www.npmjs.com/package/react-sub-unsub
- Repository: https://github.com/justinmahar/react-sub-unsub
- Homepage: https://justinmahar.github.io/react-sub-unsub/
- Issues: https://github.com/justinmahar/react-sub-unsub/issues
- npm.io page: https://npm.io/package/react-sub-unsub
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## Recent versions
- 2.2.8 (latest) — 2025-02-18
- 2.2.7 — 2024-02-10
- 2.2.6 — 2024-02-09
- 2.2.5 — 2024-02-09
- 2.2.4 — 2024-02-09
- 2.2.3 — 2024-02-09
- 2.2.2 — 2024-02-09
- 2.2.1 — 2024-02-05
- 2.1.11 — 2023-01-11
- 2.1.10 — 2022-12-28
- 2.1.9 — 2022-12-27
- 2.1.8 — 2022-12-27
- 2.1.7 — 2022-12-27
- 2.1.6 — 2022-12-27
- 2.1.5 — 2022-12-27
- … 4 more at https://npm.io/package/react-sub-unsub/versions
## README
🔔 react-sub-unsub
Manage React effect listeners with ease.
## Documentation
Read the **[official documentation](https://justinmahar.github.io/react-sub-unsub/)**.
## Overview
Take all the frustration (and memory leaks) out of adding and removing listeners in React!
With this library, you can easily manage listeners, JS timers (intervals, timeouts), and anything else that follows the subscribe/unsubscribe pattern in your React effects.
Simply use an instance of the `Subs` class in this library to subscribe to events or timers. All unsubscribe functions are stored for later.
When it's time to unsubscribe all listeners, just call `unsubAll()` to remove all listeners and clear all timers. Easy as that.
You can also create a cleanup function using `createCleanup()` that will unsubscribe all listeners when called. This is particularly handy when used as the return value for [React effects](https://reactjs.org/docs/hooks-effect.html).
For finer control or one-off subscriptions, you can use the static functions in the `Subscribe` class.
See below for examples and more.
### Features include:
- **🔔 Quickly and easily subscribe and unsubscribe to and from events**
- An easy way to subscribe and unsubscribe to/from events in JavaScript.
- **💁♀️ Covers common use cases, as well as custom ones**
- Built-in support for [EventEmitter](https://nodejs.org/api/events.html#class-eventemitter) and DOM events, and custom.
- **⏰ Timeout and interval support**
- Includes support for [setTimeout](https://developer.mozilla.org/en-US/docs/Web/API/setTimeout) and [setInterval](https://developer.mozilla.org/en-US/docs/Web/API/setInterval) to make life easier.
- **⚛️ Perfect for React effects**
- Makes adding/removing listeners and timers in React effects a breeze.
- **👍 Simple, flexible, and convenient**
- Use static functions yourself via `Subscribe`, or a `Subs` instance for ultimate convenience.
## Donate
If this project helped save you time, please consider buying me a coffee, which powers my development (and life). Your support is much appreciated!
## Table of Contents
- [Documentation](#documentation)
- [Overview](#overview)
- [Features include:](#features-include)
- [Donate](#donate)
- [Table of Contents](#table-of-contents)
- [Installation](#installation)
- [Quick Start](#quick-start)
- [Static Functions](#static-functions)
- [TypeScript](#typescript)
- [Icon Attribution](#icon-attribution)
- [Contributing](#contributing)
- [⭐ Found It Helpful? Star It!](#-found-it-helpful-star-it)
- [License](#license)
## Installation
```
npm i react-sub-unsub
```
## Quick Start
Below is a full example of adding/removing listeners in a React effect using the `Subs` class.
In this example, we will subscribe to an event emitter, a DOM event, and a custom listener interface, as well as some
timers.
At the end of the effect, we will return a cleanup function that unsubscribes all listeners and timers using `createCleanup()`.
```jsx
import React from 'react';
import { EventEmitter } from 'events';
import { Subs } from 'react-sub-unsub';
export const eventEmitter = new EventEmitter();
export const MyComponent = (props: any) => {
React.useEffect(() => {
// Listener functions
const myEventListener = () => {
console.log('My event fired!');
};
const keyPressListener = (e: any) => {
console.log('Key pressed!', e);
};
const bodySizeListener = (e: any) => {
console.log('Body size changed!', e);
};
// Use this object to subscribe and unsubscribe
const subs = new Subs();
// ➡️ Event emitter subscription
subs.subscribeEvent(eventEmitter, 'my-event', myEventListener);
// ➡️ DOM event subscription
subs.subscribeDOMEvent(document, 'keypress', keyPressListener);
// ➡️ Custom listener interface subscription
subs.subscribe(() => {
const resizeObserver = new ResizeObserver(bodySizeListener);
const targetElement = document.getElementsByTagName('body')[0];
resizeObserver.observe(targetElement);
return () => resizeObserver.unobserve(targetElement);
});
// ➡️ setTimeout subscription
subs.setTimeout(() => {
console.log('Timeout fired!');
}, 2000);
// ➡️ setInterval subscription
subs.setInterval(() => {
console.log('Interval fired!');
}, 1000);
// You can access all unsubscribe functions directly via `subs.list`
console.log(`There are ${subs.list.length} subscriptions!`);
// Return a cleanup function that unsubscribes all listeners and timers
return subs.createCleanup();
}, []);
// ...
return My Component!
;
};
```
If you need to perform other cleanup in your effect's return function, you can unsubscribe all listeners manually by calling `subs.unsubAll()`, like so:
```jsx
// Effect cleanup function
return () => {
subs.unsubAll();
// ... Custom cleanup
};
```
## Static Functions
If you'd like to call the functions used by `Subs` manually, you can use the static functions available in the `Subscribe` class:
```js
import { Subscribe } from 'react-sub-unsub';
```
Call any of the following:
- `Subscribe.subscribe` - Call provided function to subscribe to an event and return an unsubscribe function.
- `Subscribe.subscribeEvent` - Subscribe to an emitter event and return an unsubscribe function.
- `Subscribe.subscribeDOMEvent` - Subscribe to a DOM event and return an unsubscribe function.
- `Subscribe.setTimeout` - Create a subscription using `setTimeout`, return an unsubscribe function.
- `Subscribe.setInterval` - Create a subscription using `setInterval`, return an unsubscribe function.
- `Subscribe.unsubAll` - Call all provided unsubscribe functions (array or single unsubscribe).
- `Subscribe.createCleanup` - Create and return a cleanup function that, when called, calls all unsubscribe functions provided.
See the JS docs for each for more details.
## TypeScript
Type definitions have been included for [TypeScript](https://www.typescriptlang.org/) support.
## Icon Attribution
Favicon by [Twemoji](https://github.com/twitter/twemoji).
## Contributing
Open source software is awesome and so are you. 😎
Feel free to submit a pull request for bugs or additions, and make sure to update tests as appropriate. If you find a mistake in the docs, send a PR! Even the smallest changes help.
For major changes, open an issue first to discuss what you'd like to change.
## ⭐ Found It Helpful? [Star It!](https://github.com/justinmahar/react-sub-unsub/stargazers)
If you found this project helpful, let the community know by giving it a [star](https://github.com/justinmahar/react-sub-unsub/stargazers): [👉⭐](https://github.com/justinmahar/react-sub-unsub/stargazers)
Want to support the project? Feel free to grab me a coffee, which is my main source of fuel for development:
## License
See [LICENSE.md](https://justinmahar.github.io/react-sub-unsub/?path=/docs/license--docs).
---
_Source: https://npm.io/package/react-sub-unsub · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._