Little module to let callBack'ed functions return a Promise.

denodeify.js

'use strict'

function denodeifySpecial (func, callBack) {
    return function () {
        let _this = this
        let len = arguments.length
        let args = new Array(len+1)
        for (let i = 0; i<len; i++)
            args[i] = arguments[i]
        return new Promise((resolve, reject)=> {
            args[len] = function() {
                try {
                    resolve(callBack.apply(this, arguments))
                } catch(e) {
                    reject(e)
                }
            }
            func.apply(_this, args)
        })
    }
}

function standardCallBack (err, data) {
    if (err)
        throw err
    else
        return data
}

function denodeify (func) {
    return denodeifySpecial(func, standardCallBack)
}

module.exports = denodeify
module.exports.special = denodeifySpecial