angular - Angular Universal 得到“No NgModule metadata found for '[object Object]'”错误

Question

我刚刚将我的 Angular 应用程序从 5 更新到 7。在 v. 5 中，我能够很好地进行服务器端渲染 (SSR)。

更新后，SSR 失败并出现以下错误（构建过程正常）：

Error: No NgModule metadata found for '[object Object]'.
at NgModuleResolver.resolve (/app/node_modules/@angular/compiler/bundles/compiler.umd.js:20015:27)
at CompileMetadataResolver.getNgModuleMetadata (/app/node_modules/@angular/compiler/bundles/compiler.umd.js:18657:47)
at JitCompiler._loadModules (/app/node_modules/@angular/compiler/bundles/compiler.umd.js:26060:55)
at JitCompiler._compileModuleAndComponents (/app/node_modules/@angular/compiler/bundles/compiler.umd.js:26041:40)
at JitCompiler.compileModuleAsync (/app/node_modules/@angular/compiler/bundles/compiler.umd.js:26001:41)
at CompilerImpl.compileModuleAsync (/app/node_modules/@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js:202:35)
at /app/node_modules/@nguniversal/express-engine/bundles/express-engine.umd.js:109:25
at new ZoneAwarePromise (/app/node_modules/zone.js/dist/zone-node.js:910:29)
at getFactory (/app/node_modules/@nguniversal/express-engine/bundles/express-engine.umd.js:95:12)
at View.engine (/app/node_modules/@nguniversal/express-engine/bundles/express-engine.umd.js:74:13)

鉴于这个SO 问题，我没有使用"bundleDependencies": "all"，我什至尝试在 中明确说明none，angular.json但它并没有解决问题。

我正在使用此配置angular.json：

   "server": {
      "builder": "@angular-devkit/build-angular:server",
      "options": {
        "outputPath": "dist/server",
        "main": "src/main.server.ts",
        "tsConfig": "src/tsconfig.server.json",
        "bundleDependencies": "none"
      },
      "configurations": {
        "production": {
          "fileReplacements": [
            {
              "replace": "src/environments/environment.ts",
              "with": "src/environments/environment.prod.ts"
            }
          ],
          "outputHashing": "none"
        }
      }
    }

我也懒加载几乎所有模块，如果这很重要（它在第 5 版中没有）：

{ path: 'private', loadChildren: '../private/private.module#PrivateModule', canActivate: [AuthGuardService], data: { state: 'private' } as RouteDataValues },
{
  path: '', component: PageWithFooterComponent, children: [
    { path: 'about', loadChildren: '../about/about.module#AboutModule', data: { state: 'about' } as RouteDataValues },
    { path: 'instructions', loadChildren: '../instructions/instructions.module#InstructionsModule', data: { state: 'instructions' } as RouteDataValues },
    { path: '', component: HomeComponent, data: { state: 'home' } as RouteDataValues },
    { path: 'home', redirectTo: '/' },
    { path: '**', redirectTo: '/' }
  ]
}

我的服务器：

import * as ngUniversal from '@nguniversal/express-engine';
import * as compression from 'compression';
import * as express from 'express';
import * as path from 'path';
import * as appServer from '../dist/server/main.js';
// tslint:disable-next-line:no-require-imports
require('zone.js/dist/zone-node');

const ROOT = path.resolve();

const app = express();

// Server-side rendering
function angularRouter(req, res): void {
  res.render('index', { req, res });
}

// Enable compression
app.use(compression());

// Root route before static files, or it will serve a static index.html, without pre-rendering
app.get('/', angularRouter);

// Serve the static files generated by the CLI (index.html, CSS? JS, assets...)
app.use(express.static('client'));

// Configure Angular Express engine
app.engine('html', ngUniversal.ngExpressEngine({ bootstrap: appServer.AppServerModuleNgFactory }));
app.set('view engine', 'html');
app.set('views', path.join(ROOT, 'client'));

app.listen(3000, () => {
  console.log('Listening on http://localhost:3000');
});

知道什么不起作用吗？

标签： angularangular-universalserver-side-rendering

Answer 1

缺少多个部分，这确实是延迟加载模块的问题。为了解决这个问题，我将我的服务器与这台服务器进行了比较。

添加到我的服务器的代码：

import 'reflect-metadata';
import 'zone.js/dist/zone-node';

...

import { ngExpressEngine } from '@nguniversal/express-engine';
import { provideModuleMap } from '@nguniversal/module-map-ngfactory-loader';

...

const { AppServerModuleNgFactory, LAZY_MODULE_MAP } = require('../dist/server/main.js');

...

app.engine('html', ngExpressEngine({
  bootstrap: AppServerModuleNgFactory,
  providers: [
    provideModuleMap(LAZY_MODULE_MAP)
  ]
}));