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Simple and tiny event emitter library for JavaScript, support wildcard event name.
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| /* | |
| fork from https://github.com/ai/nanoevents | |
| changes: | |
| - support listening wildcard event name | |
| - return handler result, use Promise.all() to wait task done. | |
| */ | |
| ( | |
| /** | |
| * Interface for event subscription. | |
| * | |
| * @example | |
| * var NanoEvents = require('nanoevents') | |
| * | |
| * class Ticker { | |
| * constructor() { | |
| * this.emitter = new NanoEvents() | |
| * } | |
| * on() { | |
| * return this.emitter.on.apply(this.emitter, arguments) | |
| * } | |
| * tick() { | |
| * this.emitter.emit('tick') | |
| * } | |
| * } | |
| * | |
| * @alias NanoEvents | |
| * @class | |
| */ | |
| module.exports = function NanoEvents() { | |
| /** | |
| * Event names in keys and arrays with listeners in values. | |
| * @type {object} | |
| * | |
| * @example | |
| * Object.keys(ee.events) | |
| * | |
| * @alias NanoEvents#events | |
| */ | |
| this.events = {}; | |
| } | |
| ).prototype = { | |
| /** | |
| * Calls each of the listeners registered for a given event. | |
| * | |
| * @param {string} event The event name. | |
| * @param {...*} arguments The arguments for listeners. | |
| * | |
| * @return {undefined} | |
| * | |
| * @example | |
| * ee.emit('tick', tickType, tickDuration) | |
| * | |
| * @alias NanoEvents#emit | |
| * @method | |
| */ | |
| emit: function emit(event) { | |
| var args = [].slice.call(arguments, 1); | |
| // Array.prototype.call() returns empty array if context is not array-like | |
| return event | |
| .split('.') | |
| .reduce(function (h, e, i, arr) { | |
| return h.concat(this.events[arr.slice(0, i).concat('*').join('.')] || []); | |
| }.bind(this), this.events[event] || []) | |
| .map(function (i) { | |
| i.apply(null, args); | |
| }); | |
| }, | |
| /** | |
| * Add a listener for a given event. | |
| * | |
| * @param {string} event The event name. | |
| * @param {function} cb The listener function. | |
| * | |
| * @return {function} Unbind listener from event. | |
| * | |
| * @example | |
| * const unbind = ee.on('tick', (tickType, tickDuration) => { | |
| * count += 1 | |
| * }) | |
| * | |
| * disable () { | |
| * unbind() | |
| * } | |
| * | |
| * @alias NanoEvents#on | |
| * @method | |
| */ | |
| on: function on(event, cb) { | |
| if (process.env.NODE_ENV !== 'production' && typeof cb !== 'function') { | |
| throw new Error('Listener must be a function'); | |
| } | |
| (this.events[event] = this.events[event] || []).push(cb); | |
| return function () { | |
| this.events[event] = this.events[event].filter(function (i) { | |
| return i !== cb; | |
| }); | |
| }.bind(this); | |
| }, | |
| }; |
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