我有一个与.Net Core框架集成的Angular 7项目。这种情况很少发生，但是有时当我使用“ ng build --watch”构建应用程序文件时，main.js和polyfills.js文件无法正确编译。我不了解的部分是为什么它只发生在main.js和polyfills.js文件中，而不是项目中每个生成的文件中都发生。
在浏览器开发工具中发现控制台错误：
polyfills.js：SELECT
a.name,
a.id,
SUM(CASE WHEN a.sourceId = 'INTERNAL' THEN a.amount ELSE -a.amount END) AS total,
a.description,
DATEDIFF(day, a.startDate, a.endDate) AS days,
a.location,
a.linkId,
a.isMatch
FROM
DataHistory a
GROUP BY
a.name, a.id, a.description, DATEDIFF(day, a.startDate, a.endDate), a.location, a.linkId, a.isMatch
main.js：Uncaught SyntaxError: Unexpected string
我将工作中的“ dist”文件夹与损坏的“ dist”文件夹进行了比较，构建文件存放在该文件夹中，这两个文件看上去完全不同。如果我运行另一个“ ng build”，通常可以解决该问题，我很好。
这实际上不是本地问题，因为我可以使用替代方法，但是由于此错误，我的构建和部署通常会失败。任何帮助表示赞赏。
这是文件失败时的样子：
polyfills.js
Uncaught SyntaxError: Unexpected token {main.js
/**
* 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/guide/browser-support
*/
/***************************************************************************************************
* BROWSER POLYFILLS
*/
/** IE10 and IE11 requires the following for NgClass support on SVG elements */
// import 'classlist.js'; // Run `npm install --save classlist.js`.
/**
* Web Animations `@angular/platform-browser/animations`
* Only required if AnimationBuilder is used within the application and using IE/Edge or Safari.
* Standard animation support in Angular DOES NOT require any polyfills (as of Angular 6.0).
*/
// 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
* because those flags need to be set before `zone.js` being loaded, and webpack
* will put import in the top of bundle, so user need to create a separate file
* in this directory (for example: zone-flags.ts), and put the following flags
* into that file, and then add the following code before importing zone.js.
* import './zone-flags.ts';
*
* The flags allowed in zone-flags.ts are listed here.
*
* The following flags will work for all browsers.
*
* (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
*/
//# sourceMappingURL=polyfills.js.map
tsconfig：
import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app/app.module';
import { environment } from './environments/environment';
if (environment.production) {
enableProdMode();
}
platformBrowserDynamic().bootstrapModule(AppModule)
.catch(function (err) { return console.error(err); });
//# sourceMappingURL=main.js.map