app-decorators/src/helpers/lazyPolyfillLoader.js

Collection of useful ES7 Decorators, writtin in ES6, that can be used for building webapps

System.register(['app-decorators/src/libs/element-to-function'], function (_export, _context) {
    "use strict";

    var _elementToFunc, _slicedToArray, promises, lazyPolyfillLoader;

    return {
        setters: [function (_appDecoratorsSrcLibsElementToFunction) {
            _elementToFunc = _appDecoratorsSrcLibsElementToFunction.default;
        }],
        execute: function () {
            _slicedToArray = function () {
                function sliceIterator(arr, i) {
                    var _arr = [];
                    var _n = true;
                    var _d = false;
                    var _e = undefined;

                    try {
                        for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
                            _arr.push(_s.value);

                            if (i && _arr.length === i) break;
                        }
                    } catch (err) {
                        _d = true;
                        _e = err;
                    } finally {
                        try {
                            if (!_n && _i["return"]) _i["return"]();
                        } finally {
                            if (_d) throw _e;
                        }
                    }

                    return _arr;
                }

                return function (arr, i) {
                    if (Array.isArray(arr)) {
                        return arr;
                    } else if (Symbol.iterator in Object(arr)) {
                        return sliceIterator(arr, i);
                    } else {
                        throw new TypeError("Invalid attempt to destructure non-iterable instance");
                    }
                };
            }();

            promises = null;

            _export('lazyPolyfillLoader', lazyPolyfillLoader = function lazyPolyfillLoader(Loader, modules) {
                var basePath = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : '';


                // when already resolved
                if (promises) {
                    return promises;
                }

                // determine which polyfills needed
                var _modules = modules.filter(function (_ref) {
                    var _ref2 = _slicedToArray(_ref, 2),
                        global = _ref2[0],
                        property = _ref2[1];

                    return !global[property];
                });

                // when nothing to do
                if (!_modules.length) {
                    return Promise.resolve([]);
                }

                var _basePath = basePath ? basePath + '/' : basePath;

                // resolve polyfills
                promises = Promise.all(_modules.map(function (_ref3) {
                    var _ref4 = _slicedToArray(_ref3, 4),
                        global = _ref4[0],
                        property = _ref4[1],
                        path = _ref4[2],
                        assign = _ref4[3];

                    return Loader.import('' + _basePath + path).then(function (module) {
                        return !assign ? global[property] = module : null;
                    });
                }));

                promises.catch(function (error) {
                    throw new Error(error);
                });

                return promises;
            });

            _export('lazyPolyfillLoader', lazyPolyfillLoader);
        }
    };
});
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