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/ answers: 1 / hits: 20610
/ 8 Years ago, fri, august 19, 2016, 12:00:00
I got the following TypeScript program transpiled to ES5:
File 1:
class BaseElement extends HTMLElement {
constructor() {
super();
}
}
File 2:
import {BaseElement} from './BaseElement';
class MyElement extends BaseElement {
constructor() {
super();
}
}
var el = new MyElement();
Putting everything manually within a file, the code works fine and executes in the browser, the HTMLElement is constructed without problems. However, as soon as I pack it via webpack, I get the following error message:
Uncaught TypeError: Failed to construct 'HTMLElement': Please use the 'new' operator, this DOM object constructor cannot be called as a function.
Without webpack, the following JS code is constructed:
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var BaseElement = (function (_super) {
__extends(BaseElement, _super);
function BaseElement() {
_super.call(this);
}
return BaseElement;
}(HTMLElement));
var MyElement = (function (_super) {
__extends(MyElement, _super);
function MyElement() {
_super.call(this);
}
MyElement.prototype.createdCallback = function () {
this.innerHTML = lol;
};
return MyElement;
}(BaseElement));
var el = new MyElement();
Using webpack, the following code is constructed:
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
/******/ (function(modules) { // webpackBootstrap
/******/ // The module cache
/******/ var installedModules = {};
/******/ // The require function
/******/ function __webpack_require__(moduleId) {
/******/ // Check if module is in cache
/******/ if(installedModules[moduleId])
/******/ return installedModules[moduleId].exports;
/******/ // Create a new module (and put it into the cache)
/******/ var module = installedModules[moduleId] = {
/******/ exports: {},
/******/ id: moduleId,
/******/ loaded: false
/******/ };
/******/ // Execute the module function
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/ // Flag the module as loaded
/******/ module.loaded = true;
/******/ // Return the exports of the module
/******/ return module.exports;
/******/ }
/******/ // expose the modules object (__webpack_modules__)
/******/ __webpack_require__.m = modules;
/******/ // expose the module cache
/******/ __webpack_require__.c = installedModules;
/******/ // __webpack_public_path__
/******/ __webpack_require__.p = ;
/******/ // Load entry module and return exports
/******/ return __webpack_require__(0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ function(module, exports, __webpack_require__) {
__webpack_require__(1);
__webpack_require__(2);
/***/ },
/* 1 */
/***/ function(module, exports) {
use strict;
var BaseElement = (function (_super) {
__extends(BaseElement, _super);
function BaseElement() {
_super.call(this);
}
return BaseElement;
}(HTMLElement));
exports.BaseElement = BaseElement;
/***/ },
/* 2 */
/***/ function(module, exports, __webpack_require__) {
use strict;
var BaseElement_1 = __webpack_require__(1);
var MyElement = (function (_super) {
__extends(MyElement, _super);
function MyElement() {
_super.call(this);
}
MyElement.prototype.createdCallback = function () {
this.innerHTML = lol;
};
return MyElement;
}(BaseElement_1.BaseElement));
exports.MyElement = MyElement;
// TODO: inject
var p = new MyElement();
/***/ }
/******/ ]);
Basically, webpack puts any module into a function and maintains an export variable between them, however the construction of HTMLElement fails. Without webpack (code above), it works fine.
Any ideas?
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