60 lines
1.4 KiB
JavaScript
60 lines
1.4 KiB
JavaScript
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/* NODEIFY
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* Modified from original npm package "nodeify"
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* https://github.com/then/nodeify
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*
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* Removed Promise dependency, to only support
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* native Promises and reduce bundle size.
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*/
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var isPromise = require('is-promise')
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var nextTick
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if (typeof setImmediate === 'function') nextTick = setImmediate
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else if (typeof process === 'object' && process && process.nextTick) nextTick = process.nextTick
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else nextTick = function (cb) { setTimeout(cb, 0) }
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module.exports = nodeify
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function nodeify(promise, cb) {
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if (typeof cb !== 'function') return promise
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return promise
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.then(function (res) {
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nextTick(function () {
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cb(null, res)
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})
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}, function (err) {
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nextTick(function () {
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cb(err)
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})
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})
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}
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function nodeifyThis(cb) {
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return nodeify(this, cb)
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}
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nodeify.extend = extend
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nodeify.Promise = NodeifyPromise
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function extend(prom) {
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if (prom && isPromise(prom)) {
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prom.nodeify = nodeifyThis
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var then = prom.then
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prom.then = function () {
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return extend(then.apply(this, arguments))
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}
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return prom
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} else if (typeof prom === 'function') {
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prom.prototype.nodeify = nodeifyThis
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}
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}
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function NodeifyPromise(fn) {
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if (!(this instanceof NodeifyPromise)) {
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return new NodeifyPromise(fn)
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}
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Promise.call(this, fn)
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extend(this)
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}
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NodeifyPromise.prototype = Object.create(Promise.prototype)
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NodeifyPromise.prototype.constructor = NodeifyPromise
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