becky/lib/index.js

Promisify and callbackify functions

"use strict";

module.exports = {};

module.exports.callbackify = module.exports.cb = function (func) {
	return function () {
		var _this = this;

		var args = [].slice.call(arguments);
		var cb = args.pop();
		func.apply(this, args).then(function (res) {
			return cb.call(_this, null, res);
		}).catch(function (err) {
			return cb.call(_this, err);
		});
	};
};

module.exports.promisify = module.exports.p = function (func) {
	return function () {
		var _this2 = this;

		var args = [].slice.call(arguments);
		return new Promise(function (resolve, reject) {
			args.push(function (err, res) {
				err ? reject(err) : resolve(res);
			});
			func.apply(_this2, args);
		});
	};
};

module.exports.promisifyMulti = module.exports.pm = function (func) {
	return function () {
		var _this3 = this;

		var args = [].slice.call(arguments);
		return new Promise(function (resolve, reject) {
			args.push(function (err) {
				err ? reject(err) : resolve([].slice.call(arguments, 1));
			});
			func.apply(_this3, args);
		});
	};
};