This commit is contained in:
Stephen Franceschelli 2019-07-30 13:41:05 -04:00
parent 596a6da241
commit c1a589c5b6
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1.3.0 / 2018-04-15
==================
* removed bower support
* expose emitter on `exports`
* prevent de-optimization from using `arguments`
1.2.1 / 2016-04-18
==================
* enable client side use
1.2.0 / 2014-02-12
==================
* prefix events with `$` to support object prototype method names
1.1.3 / 2014-06-20
==================
* republish for npm
* add LICENSE file
1.1.2 / 2014-02-10
==================
* package: rename to "component-emitter"
* package: update "main" and "component" fields
* Add license to Readme (same format as the other components)
* created .npmignore
* travis stuff
1.1.1 / 2013-12-01
==================
* fix .once adding .on to the listener
* docs: Emitter#off()
* component: add `.repo` prop
1.1.0 / 2013-10-20
==================
* add `.addEventListener()` and `.removeEventListener()` aliases
1.0.1 / 2013-06-27
==================
* add support for legacy ie
1.0.0 / 2013-02-26
==================
* add `.off()` support for removing all listeners
0.0.6 / 2012-10-08
==================
* add `this._callbacks` initialization to prevent funky gotcha
0.0.5 / 2012-09-07
==================
* fix `Emitter.call(this)` usage
0.0.3 / 2012-07-11
==================
* add `.listeners()`
* rename `.has()` to `.hasListeners()`
0.0.2 / 2012-06-28
==================
* fix `.off()` with `.once()`-registered callbacks

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(The MIT License)
Copyright (c) 2014 Component contributors <dev@component.io>
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

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# Emitter [![Build Status](https://travis-ci.org/component/emitter.png)](https://travis-ci.org/component/emitter)
Event emitter component.
## Installation
```
$ component install component/emitter
```
## API
### Emitter(obj)
The `Emitter` may also be used as a mixin. For example
a "plain" object may become an emitter, or you may
extend an existing prototype.
As an `Emitter` instance:
```js
var Emitter = require('emitter');
var emitter = new Emitter;
emitter.emit('something');
```
As a mixin:
```js
var Emitter = require('emitter');
var user = { name: 'tobi' };
Emitter(user);
user.emit('im a user');
```
As a prototype mixin:
```js
var Emitter = require('emitter');
Emitter(User.prototype);
```
### Emitter#on(event, fn)
Register an `event` handler `fn`.
### Emitter#once(event, fn)
Register a single-shot `event` handler `fn`,
removed immediately after it is invoked the
first time.
### Emitter#off(event, fn)
* Pass `event` and `fn` to remove a listener.
* Pass `event` to remove all listeners on that event.
* Pass nothing to remove all listeners on all events.
### Emitter#emit(event, ...)
Emit an `event` with variable option args.
### Emitter#listeners(event)
Return an array of callbacks, or an empty array.
### Emitter#hasListeners(event)
Check if this emitter has `event` handlers.
## License
MIT

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/**
* Expose `Emitter`.
*/
if (typeof module !== 'undefined') {
module.exports = Emitter;
}
/**
* Initialize a new `Emitter`.
*
* @api public
*/
function Emitter(obj) {
if (obj) return mixin(obj);
};
/**
* Mixin the emitter properties.
*
* @param {Object} obj
* @return {Object}
* @api private
*/
function mixin(obj) {
for (var key in Emitter.prototype) {
obj[key] = Emitter.prototype[key];
}
return obj;
}
/**
* Listen on the given `event` with `fn`.
*
* @param {String} event
* @param {Function} fn
* @return {Emitter}
* @api public
*/
Emitter.prototype.on =
Emitter.prototype.addEventListener = function(event, fn){
this._callbacks = this._callbacks || {};
(this._callbacks['$' + event] = this._callbacks['$' + event] || [])
.push(fn);
return this;
};
/**
* Adds an `event` listener that will be invoked a single
* time then automatically removed.
*
* @param {String} event
* @param {Function} fn
* @return {Emitter}
* @api public
*/
Emitter.prototype.once = function(event, fn){
function on() {
this.off(event, on);
fn.apply(this, arguments);
}
on.fn = fn;
this.on(event, on);
return this;
};
/**
* Remove the given callback for `event` or all
* registered callbacks.
*
* @param {String} event
* @param {Function} fn
* @return {Emitter}
* @api public
*/
Emitter.prototype.off =
Emitter.prototype.removeListener =
Emitter.prototype.removeAllListeners =
Emitter.prototype.removeEventListener = function(event, fn){
this._callbacks = this._callbacks || {};
// all
if (0 == arguments.length) {
this._callbacks = {};
return this;
}
// specific event
var callbacks = this._callbacks['$' + event];
if (!callbacks) return this;
// remove all handlers
if (1 == arguments.length) {
delete this._callbacks['$' + event];
return this;
}
// remove specific handler
var cb;
for (var i = 0; i < callbacks.length; i++) {
cb = callbacks[i];
if (cb === fn || cb.fn === fn) {
callbacks.splice(i, 1);
break;
}
}
// Remove event specific arrays for event types that no
// one is subscribed for to avoid memory leak.
if (callbacks.length === 0) {
delete this._callbacks['$' + event];
}
return this;
};
/**
* Emit `event` with the given args.
*
* @param {String} event
* @param {Mixed} ...
* @return {Emitter}
*/
Emitter.prototype.emit = function(event){
this._callbacks = this._callbacks || {};
var args = new Array(arguments.length - 1)
, callbacks = this._callbacks['$' + event];
for (var i = 1; i < arguments.length; i++) {
args[i - 1] = arguments[i];
}
if (callbacks) {
callbacks = callbacks.slice(0);
for (var i = 0, len = callbacks.length; i < len; ++i) {
callbacks[i].apply(this, args);
}
}
return this;
};
/**
* Return array of callbacks for `event`.
*
* @param {String} event
* @return {Array}
* @api public
*/
Emitter.prototype.listeners = function(event){
this._callbacks = this._callbacks || {};
return this._callbacks['$' + event] || [];
};
/**
* Check if this emitter has `event` handlers.
*
* @param {String} event
* @return {Boolean}
* @api public
*/
Emitter.prototype.hasListeners = function(event){
return !! this.listeners(event).length;
};

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{
"_from": "component-emitter@^1.2.1",
"_id": "component-emitter@1.3.0",
"_inBundle": false,
"_integrity": "sha512-Rd3se6QB+sO1TwqZjscQrurpEPIfO0/yYnSin6Q/rD3mOutHvUrCAhJub3r90uNb+SESBuE0QYoB90YdfatsRg==",
"_location": "/component-emitter",
"_phantomChildren": {},
"_requested": {
"type": "range",
"registry": true,
"raw": "component-emitter@^1.2.1",
"name": "component-emitter",
"escapedName": "component-emitter",
"rawSpec": "^1.2.1",
"saveSpec": null,
"fetchSpec": "^1.2.1"
},
"_requiredBy": [
"/base",
"/cache-base"
],
"_resolved": "https://registry.npmjs.org/component-emitter/-/component-emitter-1.3.0.tgz",
"_shasum": "16e4070fba8ae29b679f2215853ee181ab2eabc0",
"_spec": "component-emitter@^1.2.1",
"_where": "E:\\github\\setup-java\\node_modules\\base",
"bugs": {
"url": "https://github.com/component/emitter/issues"
},
"bundleDependencies": false,
"component": {
"scripts": {
"emitter/index.js": "index.js"
}
},
"deprecated": false,
"description": "Event emitter",
"devDependencies": {
"mocha": "*",
"should": "*"
},
"files": [
"index.js",
"LICENSE"
],
"homepage": "https://github.com/component/emitter#readme",
"license": "MIT",
"main": "index.js",
"name": "component-emitter",
"repository": {
"type": "git",
"url": "git+https://github.com/component/emitter.git"
},
"scripts": {
"test": "make test"
},
"version": "1.3.0"
}