/** * Code refactored from Mozilla Developer Network: * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign */ 'use strict'; function assign(target, firstSource) { if (target === undefined || target === null) { throw new TypeError('Cannot convert first argument to object'); } var to = Object(target); for (var i = 1; i < arguments.length; i++) { var nextSource = arguments[i]; if (nextSource === undefined || nextSource === null) { continue; } var keysArray = Object.keys(Object(nextSource)); for (var nextIndex = 0, len = keysArray.length; nextIndex < len; nextIndex++) { var nextKey = keysArray[nextIndex]; var desc = Object.getOwnPropertyDescriptor(nextSource, nextKey); if (desc !== undefined && desc.enumerable) { to[nextKey] = nextSource[nextKey]; } } } return to; } function polyfill() { if (!Object.assign) { Object.defineProperty(Object, 'assign', { enumerable: false, configurable: true, writable: true, value: assign }); } } module.exports = { assign: assign, polyfill: polyfill };