index.js•706 B
'use strict'
exports.fromCallback = function (fn) {
return Object.defineProperty(function (...args) {
if (typeof args[args.length - 1] === 'function') fn.apply(this, args)
else {
return new Promise((resolve, reject) => {
args.push((err, res) => (err != null) ? reject(err) : resolve(res))
fn.apply(this, args)
})
}
}, 'name', { value: fn.name })
}
exports.fromPromise = function (fn) {
return Object.defineProperty(function (...args) {
const cb = args[args.length - 1]
if (typeof cb !== 'function') return fn.apply(this, args)
else {
args.pop()
fn.apply(this, args).then(r => cb(null, r), cb)
}
}, 'name', { value: fn.name })
}