event-mitter-js

A tiny (less than 1k) event emitter library.

Install

npm

npm install event-mitter-js --save

Usage

const Emitter = require('event-mitter-js');
const emitter = new Emitter();

emitter.on('some-event', function (arg1, arg2, arg3) {
 //
});

emitter.emit('some-event', 'arg1 value', 'arg2 value', 'arg3 value');

Alternatively, you can skip the initialization step by requiring event-mitter-js/instance instead. This pulls in an already initialized emitter.

const emitter = require('event-mitter-js/instance');

emitter.on('some-event', function (arg1, arg2, arg3) {
 //
});

emitter.emit('some-event', 'arg1 value', 'arg2 value', 'arg3 value');

Instance Methods

on(event, callback[, context])

Subscribe to an event

• event - the name of the event to subscribe to
• callback - the function to call when event is emitted
• context - (OPTIONAL) - the context to bind the event callback to

once(event, callback[, context])

Subscribe to an event only once

• event - the name of the event to subscribe to
• callback - the function to call when event is emitted
• context - (OPTIONAL) - the context to bind the event callback to

off(event[, callback])

Unsubscribe from an event or all events. If no callback is provided, it unsubscribes you from all events.

• event - the name of the event to unsubscribe from
• callback - the function used when binding to the event

emit(event[, arguments...])

Trigger a named event

• event - the event name to emit
• arguments... - any number of arguments to pass to the event subscribers

Test and Build

Build (Tests, Browserifies, and minifies)

npm install
npm run build

Test

npm install
npm test

License

MIT