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eventmit

★ 61 Open GitHub ↗

Simple EventEmitter. A single event object per an event.

// repository documentation

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# eventmit [![Actions Status](https://github.com/azu/eventmit/workflows/test/badge.svg)](https://github.com/azu/eventmit/actions?query=workflow%3A"test")

A single event object per an event.

## Feature

- A single event object per an event
- Tiny code base - less 1kb
- Written by TypeScript

## Install

Install with [npm](https://www.npmjs.com/):

npm install eventmit

Requirement: ECMAScript 2015 because this library use [`Set`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Set).

## Usage

Create an eventmit object and register handler and invoke handlers.

```ts
import { eventmit } from "eventmit";
const event = eventmit<{ key: string }>();
// Register handler
event.on((value) => {
    console.log(1, value);
});
event.on((value) => {
    console.log(2, value);
});
// Invoke handler
event.emit({
    key: "value"
});
// Unregister handler
event.offAll();
```

## API

```ts
export declare type EventmitHandler<T> = (value: T) => any;
export declare type Eventmitter<T> = {
    /**
     * Register an event handler
     */
    on: (handler: EventmitHandler<T>) => void;
    /**
     * Remove an event handler
     */
    off: (handler: EventmitHandler<T>) => void;
    /**
     * Remove all event handlers
     */
    offAll: () => void;
    /**
     * Invoke all handlers
     */
    emit: (value: T) => void;
};
export declare const eventmit: <T>() => Eventmitter<T>;
```

## ECMAScript Modules

You can import `eventmit` as ES Modules.

```js
import { eventmit } from "https://unpkg.com/eventmit?module";
const event = eventmit();
// Register handler
event.on((value) => {
    console.log(value);
});
// Invoke handler
event.emit("value");
```

It means that eventmit work on Browser and [Deno](https://deno.land/).

### Import at Deno
If you are using Deno, import `eventmit` from a URL.  
For example, using a CDN:

```typescript
import { eventmit } from "https://cdn.skypack.dev/eventmit?dts";
```

## Changelog

See [Releases page](https://github.com/azu/eventmit/releases).

## Running tests

Install devDependencies and Run `npm test`:

npm test

## Contributing

Pull requests and stars are always welcome.

For bugs and feature requests, [please create an issue](https://github.com/azu/eventmit/issues).

1. Fork it!
2. Create your feature branch: `git checkout -b my-new-feature`
3. Commit your changes: `git commit -am 'Add some feature'`
4. Push to the branch: `git push origin my-new-feature`
5. Submit a pull request :D

## Author

- [github/azu](https://github.com/azu)
- [twitter/azu_re](https://twitter.com/azu_re)

## License

MIT © azu

## Related

- [developit/mitt: 🥊 Tiny 200 byte functional event emitter / pubsub.](https://github.com/developit/mitt)
    - Support multiple event type

eventmit

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