https://github.com/mnasyrov/pubsub

Simple PubSub for Typescript
https://github.com/mnasyrov/pubsub

emitter pubsub typescript

Last synced: 11 months ago
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Simple PubSub for Typescript

• Host: GitHub
• URL: https://github.com/mnasyrov/pubsub
• Owner: mnasyrov
• License: mit
• Created: 2019-08-19T14:50:54.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2023-01-04T07:35:55.000Z (over 3 years ago)
• Last Synced: 2025-07-11T18:30:57.698Z (12 months ago)
• Topics: emitter, pubsub, typescript
• Language: TypeScript
• Homepage:
• Size: 1.17 MB
• Stars: 5
• Watchers: 2
• Forks: 1
• Open Issues: 15
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

          
# Simple PubSub

_Implements Publisher/Subscriber pattern. Provides a value emitter, subscription and consumer interface. Supports Typescript._

[![npm version](https://badge.fury.io/js/%40mnasyrov%2Fpubsub.svg)](https://www.npmjs.com/@mnasyrov/pubsub)

[![Actions Status](https://github.com/mnasyrov/pubsub/workflows/build/badge.svg)](https://github.com/mnasyrov/pubsub/actions)

[![Conventional Commits](https://img.shields.io/badge/Conventional%20Commits-1.0.0-yellow.svg)](https://conventionalcommits.org)

## Usage

Install dependencies:

```bash

$ npm install --save @mnasyrov/pubsub

```

Create an emitter and publish a value to consumers:

```typescript

import {Emitter} from '@mnasyrov/pubsub';

// Declare a value emitter.

const emitter = new Emitter();

// Subscribe by a listener.

const subscription = emitter.subscribe(value => {

  console.log(value);

});

// Emit a value.

emitter.emit(42);

// Cancel a subscription.

subscription.unsubscribe();

```

## Public API

```typescript

/** Allows to cancel a subscription. It is compatible with RxJS/Subscription. */

export interface Subscription {

  unsubscribe(): void;

}

export type Consumer = (value: T) => any;

export interface Publisher {

  subscribe(consumer: Consumer): Subscription;

}

export interface Emitter {

  constructor();

  /** A number of subscribed consumers. */

  readonly size: number;

  /** Subscribes a consumer of values. */

  subscribe(consumer: Consumer): Subscription;

  /** Emits a value to subscribed consumers. */

  emit(value: T);

  /** Removes all subscribed consumers. */

  clear();

}

```

## License

[MIT](LICENSE)