emitter20


An event emitter that used to be 20 lines of code but is still quite small. No dependencies.

Install

``sh
$ npm install --save emitter20
`

Methods

- on: (eventName: string, callback: Function) => void - Subscribe a callback to the given event type.
- off: (eventName: string, callback: Function) => void - Remove a callback from the given event type.
- trigger: (eventName: string, callback: Function) => void - Trigger an event, invoking all subscribers.
- clear: (eventName?: string) => void - Remove all subscribers from the given event type, or all subscribers if no event type is specified.




Usage

`js
var Emitter = require('emitter20')

var emitter = new Emitter()

emitter.on('karate-chop', function() {
console.log('Haiaaaaaa!')
})

emitter.trigger('karate-chop') // Haiaaaaa!'
`

Pass arbitrary data to the event handler:

`js
var emitter = new Emitter()

emitter.on('welcome', function(name) {
console.log(Welcome {name}!)
})

emitter.trigger('welcome', 'bob') // Welcome bob!
`

Can be used as a mixin:

`js
var assign = require('lodash.assign')

var obj = { a: 1, b: 2 }
assign(obj, new Emitter())

obj.on('karate-chop', function() {
console.log('Haiaaaaaa!')
})

obj.trigger('karate-chop') // Haiaaaaa!'
``

License

ISC © Raine Revere