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/lib/node_modules/pm2/node_modules/eventemitter2/

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lib	dir	drwxr-xr-x	2022-01-07 17:38	R D
CHANGELOG.md	1.628 KB	-rw-r--r--	2022-01-07 17:38	R E G D
LICENSE.txt	1.131 KB	-rw-r--r--	2022-01-07 17:38	R E G D
README.md	10.175 KB	-rw-r--r--	2022-01-07 17:38	R E G D
eventemitter2.d.ts	2.237 KB	-rw-r--r--	2022-01-07 17:38	R E G D
index.js	0.049 KB	-rw-r--r--	2022-01-07 17:38	R E G D
package.json	1.672 KB	-rw-r--r--	2022-01-07 17:38	R E G D
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[![Codeship](https://img.shields.io/codeship/3ad58940-4c7d-0131-15d5-5a8cd3f550f8.svg?maxAge=2592000)]() [![NPM version](https://badge.fury.io/js/eventemitter2.svg)](http://badge.fury.io/js/eventemitter2) [![Dependency Status](https://img.shields.io/david/asyncly/eventemitter2.svg)](https://david-dm.org/asyncly/eventemitter2) [![npm](https://img.shields.io/npm/dm/eventemitter2.svg?maxAge=2592000)]() # SYNOPSIS EventEmitter2 is an implementation of the EventEmitter module found in Node.js. In addition to having a better benchmark performance than EventEmitter and being browser-compatible, it also extends the interface of EventEmitter with additional non-breaking features. # DESCRIPTION ### FEATURES - Namespaces/Wildcards. - Times To Listen (TTL), extends the `once` concept with `many`. - Browser environment compatibility. - Demonstrates good performance in benchmarks ``` EventEmitterHeatUp x 3,728,965 ops/sec \302\2610.68% (60 runs sampled) EventEmitter x 2,822,904 ops/sec \302\2610.74% (63 runs sampled) EventEmitter2 x 7,251,227 ops/sec \302\2610.55% (58 runs sampled) EventEmitter2 (wild) x 3,220,268 ops/sec \302\2610.44% (65 runs sampled) Fastest is EventEmitter2 ``` ### Differences (Non-breaking, compatible with existing EventEmitter) - The EventEmitter2 constructor takes an optional configuration object. ```javascript var EventEmitter2 = require('eventemitter2').EventEmitter2; var server = new EventEmitter2({ // // set this to `true` to use wildcards. It defaults to `false`. // wildcard: true, // // the delimiter used to segment namespaces, defaults to `.`. // delimiter: '::', // // set this to `true` if you want to emit the newListener event. The default value is `true`. // newListener: false, // // the maximum amount of listeners that can be assigned to an event, default 10. // maxListeners: 20, // // show event name in memory leak message when more than maximum amount of listeners is assigned, default false // verboseMemoryLeak: false }); ``` - Getting the actual event that fired. ```javascript server.on('foo.*', function(value1, value2) { console.log(this.event, value1, value2); }); ``` - Fire an event N times and then remove it, an extension of the `once` concept. ```javascript server.many('foo', 4, function() { console.log('hello'); }); ``` - Pass in a namespaced event as an array rather than a delimited string. ```javascript server.many(['foo', 'bar', 'bazz'], 4, function() { console.log('hello'); }); ``` # Installing ```console $ npm install --save eventemitter2 ``` # API When an `EventEmitter` instance experiences an error, the typical action is to emit an `error` event. Error events are treated as a special case. If there is no listener for it, then the default action is to print a stack trace and exit the program. All EventEmitters emit the event `newListener` when new listeners are added. EventEmitters also emit the event `removeListener` when listeners are removed, and `removeListenerAny` when listeners added through `onAny` are removed. **Namespaces** with **Wildcards** To use namespaces/wildcards, pass the `wildcard` option into the EventEmitter constructor. When namespaces/wildcards are enabled, events can either be strings (`foo.bar`) separated by a delimiter or arrays (`['foo', 'bar']`). The delimiter is also configurable as a constructor option. An event name passed to any event emitter method can contain a wild card (the `*` character). If the event name is a string, a wildcard may appear as `foo.*`. If the event name is an array, the wildcard may appear as `['foo', '*']`. If either of the above described events were passed to the `on` method, subsequent emits such as the following would be observed... ```javascript emitter.emit('foo.bazz'); emitter.emit(['foo', 'bar']); ``` **NOTE:** An event name may use more than one wildcard. For example, `foo.*.bar.*` is a valid event name, and would match events such as `foo.x.bar.y`, or `['foo', 'bazz', 'bar', 'test']` # Multi-level Wildcards A double wildcard (the string `**`) matches any number of levels (zero or more) of events. So if for example `'foo.**'` is passed to the `on` method, the following events would be observed: ````javascript emitter.emit('foo'); emitter.emit('foo.bar'); emitter.emit('foo.bar.baz'); ```` On the other hand, if the single-wildcard event name was passed to the on method, the callback would only observe the second of these events. ### emitter.addListener(event, listener) ### emitter.on(event, listener) Adds a listener to the end of the listeners array for the specified event. ```javascript server.on('data', function(value1, value2, value3, ...) { console.log('The event was raised!'); }); ``` ```javascript server.on('data', function(value) { console.log('The event was raised!'); }); ``` ### emitter.prependListener(event, listener) Adds a listener to the beginning of the listeners array for the specified event. ```javascript server.prependListener('data', function(value1, value2, value3, ...) { console.log('The event was raised!'); }); ``` ### emitter.onAny(listener) Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the callback. ```javascript server.onAny(function(event, value) { console.log('All events trigger this.'); }); ``` ### emitter.prependAny(listener) Adds a listener that will be fired when any event is emitted. The event name is passed as the first argument to the callback. The listener is added to the beginning of the listeners array ```javascript server.prependAny(function(event, value) { console.log('All events trigger this.'); }); ``` ### emitter.offAny(listener) Removes the listener that will be fired when any event is emitted. ```javascript server.offAny(function(value) { console.log('The event was raised!'); }); ``` #### emitter.once(event, listener) Adds a **one time** listener for the event. The listener is invoked only the first time the event is fired, after which it is removed. ```javascript server.once('get', function (value) { console.log('Ah, we have our first value!'); }); ``` #### emitter.prependOnceListener(event, listener) Adds a **one time** listener for the event. The listener is invoked only the first time the event is fired, after which it is removed. The listener is added to the beginning of the listeners array ```javascript server.prependOnceListener('get', function (value) { console.log('Ah, we have our first value!'); }); ``` ### emitter.many(event, timesToListen, listener) Adds a listener that will execute **n times** for the event before being removed. The listener is invoked only the first **n times** the event is fired, after which it is removed. ```javascript server.many('get', 4, function (value) { console.log('This event will be listened to exactly four times.'); }); ``` ### emitter.prependMany(event, timesToListen, listener) Adds a listener that will execute **n times** for the event before being removed. The listener is invoked only the first **n times** the event is fired, after which it is removed. The listener is added to the beginning of the listeners array. ```javascript server.many('get', 4, function (value) { console.log('This event will be listened to exactly four times.'); }); ``` ### emitter.removeListener(event, listener) ### emitter.off(event, listener) Remove a listener from the listener array for the specified event. **Caution**: Calling this method changes the array indices in the listener array behind the listener. ```javascript var callback = function(value) { console.log('someone connected!'); }; server.on('get', callback); // ... server.removeListener('get', callback); ``` ### emitter.removeAllListeners([event]) Removes all listeners, or those of the specified event. ### emitter.setMaxListeners(n) By default EventEmitters will print a warning if more than 10 listeners are added to it. This is a useful default which helps finding memory leaks. Obviously not all Emitters should be limited to 10. This function allows that to be increased. Set to zero for unlimited. ### emitter.listeners(event) Returns an array of listeners for the specified event. This array can be manipulated, e.g. to remove listeners. ```javascript server.on('get', function(value) { console.log('someone connected!'); }); console.log(server.listeners('get')); // [ [Function] ] ``` ### emitter.listenersAny() Returns an array of listeners that are listening for any event that is specified. This array can be manipulated, e.g. to remove listeners. ```javascript server.onAny(function(value) { console.log('someone connected!'); }); console.log(server.listenersAny()[0]); // [ [Function] ] ``` ### emitter.emit(event, [arg1], [arg2], [...]) Execute each of the listeners that may be listening for the specified event name in order with the list of arguments. ### emitter.emitAsync(event, [arg1], [arg2], [...]) Return the results of the listeners via [Promise.all](https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Promise/all). Only this method doesn't work [IE](http://caniuse.com/#search=promise). ```javascript emitter.on('get',function(i) { return new Promise(function(resolve){ setTimeout(function(){ resolve(i+3); },50); }); }); emitter.on('get',function(i) { return new Promise(function(resolve){ resolve(i+2) }); }); emitter.on('get',function(i) { return Promise.resolve(i+1); }); emitter.on('get',function(i) { return i+0; }); emitter.on('get',function(i) { // noop }); emitter.emitAsync('get',0) .then(function(results){ console.log(results); // [3,2,1,0,undefined] }); ``` ### emitter.eventNames() Returns an array listing the events for which the emitter has registered listeners. The values in the array will be strings. ```javascript emitter.on('foo', () => {}); emitter.on('bar', () => {}); console.log(emitter.eventNames()); // Prints: [ 'foo', 'bar' ] ```