| 1 |
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| 2 | const Emitter = require('tiny-emitter')
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| 3 |
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| 4 | /**
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| 5 | * Extend given object with emitter functions `on`, `off`, `once`, `emit`
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| 6 | * @param {Object} obj
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| 7 | * @return {Object} obj
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| 8 | */
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| 9 | exports.mixin = function (obj) {
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| 10 | // create event emitter
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| 11 | const emitter = new Emitter()
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| 12 |
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| 13 | // bind methods to obj (we don't want to expose the emitter.e Array...)
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| 14 | obj.on = emitter.on.bind(emitter)
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| 15 | obj.off = emitter.off.bind(emitter)
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| 16 | obj.once = emitter.once.bind(emitter)
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| 17 | obj.emit = emitter.emit.bind(emitter)
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| 18 |
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| 19 | return obj
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| 20 | }
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