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# Emitter [](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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