sp-boilerplate/apps/app/client/critical.extra-old-ie.js

Superproject Demo.

(() => {
    require('es5-shim')
    require('es5-shim/es5-sham')

    // http://fedvic.com/2016/01/15/extendInBabel/
    if (!(Object.setPrototypeOf || {}.__proto__)) {
        var nativeGetPrototypeOf = Object.getPrototypeOf;

        Object.getPrototypeOf = function (object) {
            if (object.__proto__) {
                return object.__proto__;
            } else {
                return nativeGetPrototypeOf.call(Object, object);
            }
        }
    }

    if (typeof Object.assign != 'function') {
        Object.assign = function (target, varArgs) { // .length of function is 2
            'use strict';
            if (target == null) { // TypeError if undefined or null
                throw new TypeError('Cannot convert undefined or null to object');
            }

            var to = Object(target);

            for (var index = 1; index < arguments.length; index++) {
                var nextSource = arguments[index];

                if (nextSource != null) { // Skip over if undefined or null
                    for (var nextKey in nextSource) {
                        // Avoid bugs when hasOwnProperty is shadowed
                        if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
                            to[nextKey] = nextSource[nextKey];
                        }
                    }
                }
            }
            return to;
        };
    }

    if (typeof requestAnimationFrame === 'undefined')
        window.requestAnimationFrame = function (callback) {
            setTimeout(callback, 0);
        };
})()

require('classlist-polyfill')