30 lines
861 B
JavaScript
30 lines
861 B
JavaScript
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'use strict'
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exports.fromCallback = function (fn) {
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return Object.defineProperty(function () {
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if (typeof arguments[arguments.length - 1] === 'function') fn.apply(this, arguments)
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else {
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return new Promise((resolve, reject) => {
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arguments[arguments.length] = (err, res) => {
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if (err) return reject(err)
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resolve(res)
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}
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arguments.length++
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fn.apply(this, arguments)
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})
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}
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}, 'name', { value: fn.name })
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}
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exports.fromPromise = function (fn) {
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return Object.defineProperty(function () {
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const cb = arguments[arguments.length - 1]
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if (typeof cb !== 'function') return fn.apply(this, arguments)
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else {
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delete arguments[arguments.length - 1]
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arguments.length--
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fn.apply(this, arguments).then(r => cb(null, r), cb)
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}
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}, 'name', { value: fn.name })
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}
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