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