角7：未捕获的ReferenceError：添加包时未定义全局

Question

我正在构建一个Angular 7应用程序，当我添加一个包npm install dragula --save并将其导入pollyfills.ts文件时，出现此错误：

index.js：2未捕获的ReferenceError：在Object ../ node_modules / crossvent / src 处的webpack_require（bootstrap：83）处的Object ../ node_modules / custom-event / index.js（index.js：2）处未定义全局/crossvent.js（crossvent.js：3）在webpack_require（自举：83）在对象../ node_modules / dragula / dragula.js（dragula.js：4）在webpack_require（自举：83）在模块../ SRC在webpack_require（bootstrap：83）上的/polyfills.ts（polyfills.ts：1）在object.1（polyfills.ts：92）在webpack_require（bootstrap：83）

当我用谷歌搜索时，每个人都说要添加(window as any).global = window;到pollyfills.ts我已经做到这一点，但我仍然收到错误。我也准备删除node_modules文件夹，并且npm i我也已经完成了。

我不知道还要在这里做什么。谁能告诉我一些建议或至少解释为什么会这样？

这可能无关紧要，但我也将添加它。在将它们导入之前，还存在一个错误pollyfills.ts

Accordion-group.component.ts：9 Uncaught ReferenceError：未在webpack_require（../src/app/components/accordion/accordion-group.component.ts（accordion-group.component.ts：9）上定义全局变量 bootstrap：83）在Module ../ src / app / components / accordion / accordion.module.ts（accordion.component.ts：10）在webpack_require（bootstrap：83）在Module ../ src / app / shared / shared .module.ts（window.extensions.ts：15）在webpack_require（自举：83）在模块../ SRC /应用/ app.module.ts（app.constants.ts：17）在webpack_require（自举：83）在Module ../ src / main.ts（main.ts：1）在webpack_require（bootstrap：83）

Answer 1

也可以通过添加来解决

(window as any).global = window;

到您的polyfills.ts.

参考：https : //github.com/angular/angular-cli/issues/9827#issuecomment-386154063

Answer 2

几周前我遇到了类似的问题，现在我在polyfills.ts中更改了几个沉降值时就解决了，它看起来像：

/**
 * This file includes polyfills needed by Angular and is loaded before the app.
 * You can add your own extra polyfills to this file.
 *
 * This file is divided into 2 sections:
 *   1. Browser polyfills. These are applied before loading ZoneJS and are sorted by browsers.
 *   2. Application imports. Files imported after ZoneJS that should be loaded before your main
 *      file.
 *
 * The current setup is for so-called "evergreen" browsers; the last versions of browsers that
 * automatically update themselves. This includes Safari >= 10, Chrome >= 55 (including Opera),
 * Edge >= 13 on the desktop, and iOS 10 and Chrome on mobile.
 *
 * Learn more in https://angular.io/docs/ts/latest/guide/browser-support.html
 */

/***************************************************************************************************
 * BROWSER POLYFILLS
 */

/** IE9, IE10 and IE11 requires all of the following polyfills. **/
// import 'core-js/es6/symbol';
// import 'core-js/es6/object';
// import 'core-js/es6/function';
// import 'core-js/es6/parse-int';
// import 'core-js/es6/parse-float';
// import 'core-js/es6/number';
// import 'core-js/es6/math';
// import 'core-js/es6/string';
// import 'core-js/es6/date';
// import 'core-js/es6/array';
// import 'core-js/es6/regexp';
// import 'core-js/es6/map';
// import 'core-js/es6/weak-map';
// import 'core-js/es6/set';

/** IE10 and IE11 requires the following for NgClass support on SVG elements */
// import 'classlist.js';  // Run `npm install --save classlist.js`.

/** IE10 and IE11 requires the following for the Reflect API. */
// import 'core-js/es6/reflect';


/** Evergreen browsers require these. **/
// Used for reflect-metadata in JIT. If you use AOT (and only Angular decorators), you can remove.
import 'core-js/es7/reflect';


/**
 * Required to support Web Animations `@angular/platform-browser/animations`.
 * Needed for: All but Chrome, Firefox and Opera. http://caniuse.com/#feat=web-animation
 **/
import 'web-animations-js';  // Run `npm install --save web-animations-js`.

/**
 * By default, zone.js will patch all possible macroTask and DomEvents
 * user can disable parts of macroTask/DomEvents patch by setting following flags
 */

 // (window as any).__Zone_disable_requestAnimationFrame = true; // disable patch requestAnimationFrame
 // (window as any).__Zone_disable_on_property = true; // disable patch onProperty such as onclick
 // (window as any).__zone_symbol__BLACK_LISTED_EVENTS = ['scroll', 'mousemove']; // disable patch specified eventNames

 /*
 * in IE/Edge developer tools, the addEventListener will also be wrapped by zone.js
 * with the following flag, it will bypass `zone.js` patch for IE/Edge
 */
// (window as any).__Zone_enable_cross_context_check = true;

/***************************************************************************************************
 * Zone JS is required by default for Angular itself.
 */
import 'zone.js/dist/zone';  // Included with Angular CLI.



/***************************************************************************************************
 * APPLICATION IMPORTS
 */

(window as any)['global'] = window;

试试这个方法，让我知道。

app.module.ts还要看一下-您是否以良好的方式导入了Dragula？

@NgModule({
    declarations: [
        ...
    ],
    imports: [
        ...
        DragulaModule.forRoot(),
        ...
    ],
    exports: [
        ...
    ],
    providers: [
       ...    ],
    bootstrap: [AppComponent]
})

请注意，这应该是app.module.ts您应用的主要版本，而不是任何子模块或延迟加载的模块。

Answer 3

在我看来，最好的解决方案是将此代码添加到 index.html 中以进行测试

<script>
  if (global === undefined) {
    var global = window;
  }
</script>

以及为生产构建的这段代码（安装多米诺骨牌......首先使用 npm install）

const domino = require('domino');
const fs = require('fs');
const path = require('path');
const template = fs
  .readFileSync(path.join('dist/browser', 'index.html'))
  .toString();
const window = domino.createWindow(template);

// Ignite UI browser objects abstractions
(global as any).window = window;
(global as any).document = window.document;
(global as any).Event = window.Event;
(global as any).KeyboardEvent = window.KeyboardEvent;
(global as any).MouseEvent = window.MouseEvent;
(global as any).FocusEvent = window.FocusEvent;
(global as any).PointerEvent = window.PointerEvent;
(global as any).HTMLElement = window.HTMLElement;
(global as any).HTMLElement.prototype.getBoundingClientRect = () => {
    return {
      left: '',
      right: '',
      top: '',
      bottom: ''
  };
};

// If using IgxIconService to register icons
(global as any).XMLHttpRequest = require('xmlhttprequest').XMLHttpRequest;

// Other optional depending on your application configuration
(global as any).object = window.object;
(global as any).navigator = window.navigator;
(global as any).localStorage = window.localStorage;
(global as any).DOMTokenList = window.DOMTokenList;