domotz-remote-pawn/src/utils/polyfills.js

Domotz Agent

module.exports.load = function () {
    /* String.startswith */
    if (!String.prototype.startsWith) {
        String.prototype.startsWith = function (searchString, position) {
            return this.substr(position || 0, searchString.length) === searchString;
        };
    }

    // From https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/some
    if (!Array.prototype.some) {
        Array.prototype.some = function (fun, thisArg) {
            'use strict';

            if (this == null) {
                throw new TypeError('Array.prototype.some called on null or undefined');
            }

            if (typeof fun !== 'function') {
                throw new TypeError();
            }

            var t = Object(this);
            var len = t.length >>> 0;

            for (var i = 0; i < len; i++) {
                if (i in t && fun.call(thisArg, t[i], i, t)) {
                    return true;
                }
            }

            return false;
        };
    }


// Production steps of ECMA-262, Edition 6, 22.1.2.1
    if (!Array.from) {
        Array.from = (function () {
            var symbolIterator;
            try {
                symbolIterator = Symbol.iterator
                    ? Symbol.iterator
                    : 'Symbol(Symbol.iterator)';
            } catch (e) {
                symbolIterator = 'Symbol(Symbol.iterator)';
            }

            var toStr = Object.prototype.toString;
            var isCallable = function (fn) {
                return (
                    typeof fn === 'function' ||
                    toStr.call(fn) === '[object Function]'
                );
            };
            var toInteger = function (value) {
                var number = Number(value);
                if (isNaN(number)) {
                    return 0;
                }
                if (number === 0 || !isFinite(number)) {
                    return number;
                }
                return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number));
            };
            var maxSafeInteger = Math.pow(2, 53) - 1;
            var toLength = function (value) {
                var len = toInteger(value);
                return Math.min(Math.max(len, 0), maxSafeInteger);
            };

            var setGetItemHandler = function setGetItemHandler(isIterator, items) {
                var iterator = isIterator && items[symbolIterator]();
                return function getItem(k) {
                    return isIterator ? iterator.next() : items[k];
                };
            };

            var getArray = function getArray(
                T,
                A,
                len,
                getItem,
                isIterator,
                mapFn
            ) {
                // 16. Let k be 0.
                var k = 0;

                // 17. Repeat, while k < len… or while iterator is done (also steps a - h)
                while (k < len || isIterator) {
                    var item = getItem(k);
                    var kValue = isIterator ? item.value : item;

                    if (isIterator && item.done) {
                        return A;
                    } else {
                        if (mapFn) {
                            A[k] =
                                typeof T === 'undefined'
                                    ? mapFn(kValue, k)
                                    : mapFn.call(T, kValue, k);
                        } else {
                            A[k] = kValue;
                        }
                    }
                    k += 1;
                }

                if (isIterator) {
                    throw new TypeError(
                        'Array.from: provided arrayLike or iterator has length more then 2 ** 52 - 1'
                    );
                } else {
                    A.length = len;
                }

                return A;
            };

            // The length property of the from method is 1.
            return function from(arrayLikeOrIterator /*, mapFn, thisArg */) {
                // 1. Let C be the this value.
                var C = this;

                // 2. Let items be ToObject(arrayLikeOrIterator).
                var items = Object(arrayLikeOrIterator);
                var isIterator = isCallable(items[symbolIterator]);

                // 3. ReturnIfAbrupt(items).
                if (arrayLikeOrIterator == null && !isIterator) {
                    throw new TypeError(
                        'Array.from requires an array-like object or iterator - not null or undefined'
                    );
                }

                // 4. If mapfn is undefined, then let mapping be false.
                var mapFn = arguments.length > 1 ? arguments[1] : void undefined;
                var T;
                if (typeof mapFn !== 'undefined') {
                    // 5. else
                    // 5. a If IsCallable(mapfn) is false, throw a TypeError exception.
                    if (!isCallable(mapFn)) {
                        throw new TypeError(
                            'Array.from: when provided, the second argument must be a function'
                        );
                    }

                    // 5. b. If thisArg was supplied, let T be thisArg; else let T be undefined.
                    if (arguments.length > 2) {
                        T = arguments[2];
                    }
                }

                // 10. Let lenValue be Get(items, "length").
                // 11. Let len be ToLength(lenValue).
                var len = toLength(items.length);

                // 13. If IsConstructor(C) is true, then
                // 13. a. Let A be the result of calling the [[Construct]] internal method
                // of C with an argument list containing the single item len.
                // 14. a. Else, Let A be ArrayCreate(len).
                var A = isCallable(C) ? Object(new C(len)) : new Array(len);

                return getArray(
                    T,
                    A,
                    len,
                    setGetItemHandler(isIterator, items),
                    isIterator,
                    mapFn
                );
            };
        }());
    }

    if (typeof Object.assign !== 'function') {
        // Must be writable: true, enumerable: false, configurable: true
        Object.defineProperty(Object, 'assign', {
            value: function assign(target, varArgs) { // .length of function is 2
                'use strict';
                if (target === null || target === undefined) {
                    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 && nextSource !== undefined) {
                        for (var nextKey in nextSource) {
                            // Avoid bugs when hasOwnProperty is shadowed
                            if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
                                to[nextKey] = nextSource[nextKey];
                            }
                        }
                    }
                }
                return to;
            },
            writable: true,
            configurable: true
        });
    }

    if (!String.prototype.includes) {
        String.prototype.includes = function (search, start) {
            'use strict';

            if (search instanceof RegExp) {
                throw TypeError('first argument must not be a RegExp');
            }
            if (start === undefined) {
                start = 0;
            }
            return this.indexOf(search, start) !== -1;
        };
    }

    if (!Array.prototype.includes) {
        //or use Object.defineProperty
        Array.prototype.includes = function (search) {
            return !!~this.indexOf(search);
        }
    }
};