37 lines
967 B
JavaScript
37 lines
967 B
JavaScript
'use strict'
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const { promisify } = require('util')
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const handler = {
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get: function (target, prop, receiver) {
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if (typeof target[prop] !== 'function') {
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return target[prop]
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}
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if (target[prop][promisify.custom]) {
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return function () {
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return Reflect.get(target, prop, receiver)[promisify.custom].apply(target, arguments)
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}
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}
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return function () {
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return new Promise((resolve, reject) => {
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Reflect.get(target, prop, receiver).apply(target, [...arguments, function (err, result) {
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if (err) {
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return reject(err)
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}
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resolve(result)
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}])
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})
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}
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}
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}
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module.exports = function (thingToPromisify) {
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if (typeof thingToPromisify === 'function') {
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return promisify(thingToPromisify)
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}
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if (typeof thingToPromisify === 'object') {
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return new Proxy(thingToPromisify, handler)
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}
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throw new TypeError('Can only promisify functions or objects')
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}
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