No NgModule metadata found for 'AppModule' after upgrade from Angular 5 to Angular 7

问题

Our dev team recently updated an Angular 5 project to Angular 7. I've downloaded the repo and I'm trying to build the source, however when I run the ng build command I get a ERROR in No NgModule metadata found for 'AppModule'.

If I run the ng --version command it shows the following:

Angular CLI: 7.3.6
Node: 11.10.0
OS: win32 x64
Angular: 7.2.10

The app.module.ts file is:

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { AdminComponent } from './layout/admin/admin.component';
import { AdminComponent1 } from './layout/admin1/estimate.component';
import { AuthComponent } from './layout/auth/auth.component';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { SharedModule } from './shared/shared.module';
import { MenuItems } from './shared/menu-items/menu-items';
import { BreadcrumbsComponent } from './layout/admin/breadcrumbs/breadcrumbs.component';
import { ServicesProvider } from '../providers/services';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AuthGuardService } from './activate-guard';
import { AuthLoginService } from './deactivate-guard';
import { SupperAdmin } from './supperadmin-guard';
import { NgProgressModule } from 'ngx-progressbar';
import {SimpleNotificationsModule} from 'angular2-notifications';
import { ConfigService } from '../assets/config/ConfigService';


@NgModule({
  declarations: [
    AppComponent,
    AdminComponent,
    AdminComponent1,
    AuthComponent,
    BreadcrumbsComponent,
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    FormsModule,
    ReactiveFormsModule,
    AppRoutingModule,
    SharedModule,
    NgProgressModule,
    SimpleNotificationsModule.forRoot(),
    BrowserModule,


  ],
  providers: [MenuItems, ServicesProvider, AuthGuardService, SupperAdmin, AuthLoginService,  NgProgressModule, ConfigService],
  bootstrap: [AppComponent]
})
export class AppModule { }

and the main.ts file is:

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(err => console.log(err));

And the index.html is as follows:

<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <title>Welcome</title>
  <base href="/">
  <!-- <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> -->
<script async defer src="https://maps.googleapis.com/maps/api/js?key=xxx"></script>
<!-- <script src="https://maps.googleapis.com/maps/api/js"
async defer></script> -->
  <!-- <script src="../src/assets/js/pdf.js"></script>
  <script src="../src/assets/js/pdf.worker.js"></script> -->
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
  <script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>

  <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0, minimal-ui">
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="description" content="Visual Estimator" />
  <meta name="keywords" content="visualestimator" />
  <meta name="author" content="phoenixcoded" />
  <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate"/>
  <meta http-equiv="Pragma" content="no-cache"/>
  <meta http-equiv="Expires" content="0"/>
  <link rel="icon" type="image/x-icon" href="favicon.ico">
  <style>
  </style>
  <!-- Google font-->
  <link href="https://fonts.googleapis.com/css?family=Roboto:400,500" rel="stylesheet">
  <link href="https://cdn.jsdelivr.net/npm/ng2-toastr@4.1.2/ng2-toastr.css" rel="stylesheet" />
</head>

<body>
  <app-root>
    <div class="theme-loader">
      <div class="loader-track">
        <div class="preloader-wrapper">
          <div class="spinner-layer spinner-blue">
            <div class="circle-clipper left">
              <div class="circle"></div>
            </div>
            <div class="gap-patch">
              <div class="circle"></div>
            </div>
            <div class="circle-clipper right">
              <div class="circle"></div>
            </div>
          </div>
          <div class="spinner-layer spinner-red">
            <div class="circle-clipper left">
              <div class="circle"></div>
            </div>
            <div class="gap-patch">
              <div class="circle"></div>
            </div>
            <div class="circle-clipper right">
              <div class="circle"></div>
            </div>
          </div>

          <div class="spinner-layer spinner-yellow">
            <div class="circle-clipper left">
              <div class="circle"></div>
            </div>
            <div class="gap-patch">
              <div class="circle"></div>
            </div>
            <div class="circle-clipper right">
              <div class="circle"></div>
            </div>
          </div>

          <div class="spinner-layer spinner-green">
            <div class="circle-clipper left">
              <div class="circle"></div>
            </div>
            <div class="gap-patch">
              <div class="circle"></div>
            </div>
            <div class="circle-clipper right">
              <div class="circle"></div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </app-root>
</body>
<script src='https://api.tiles.mapbox.com/mapbox.js/plugins/leaflet-image/v0.0.4/leaflet-image.js'></script>
<script>
</script>
</html>

And the angular.json file:

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "mega-able": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist",
            "index": "src/index.html",
            "main": "src/main.ts",
            "tsConfig": "src/tsconfig.app.json",
            "polyfills": "src/polyfills.ts",
            "assets": [
              "src/assets",
              "src/favicon.ico",
              "src/marker-icon.png",
              "src/marker-icon-2x.png"
            ],
            "styles": [
              "./node_modules/bootstrap/dist/css/bootstrap.min.css",
              "./node_modules/ngx-bootstrap/datepicker/bs-datepicker.css",
              "node_modules/bootstrap/scss/bootstrap.scss",
              "node_modules/font-awesome-scss/scss/font-awesome.scss",
              "src/assets/images/zommer/leaflet/dist/leaflet.css",
              "src/assets/images/zommer/leaflet-draw-toolbar/dist/leaflet.draw-toolbar.css",
              "src/assets/images/zommer/leaflet-toolbar/dist/leaflet.toolbar.css",
              "src/assets/images/zommer/leaflet-draw/dist/leaflet.draw-src.css",
              "src/scss/style.scss"
            ],
            "scripts": [
              "src/assets/images/zommer/jquery.min.js",
              "src/assets/images/zommer/bootstrap.min.js",
              "src/assets/images/zommer/leaflet/dist/leaflet-src.js",
              "src/assets/images/zommer/leaflet/dist/leaflet.rotatedMarker.js",
              "src/assets/images/zommer/leaflet-toolbar/dist/leaflet.toolbar-src.js",
              "src/assets/images/zommer/leaflet-draw/dist/leaflet.draw-src.js",
              "src/assets/images/zommer/leaflet-draw-toolbar/dist/leaflet.draw-toolbar.js",
              "src/assets/images/zommer/color.js",
              "src/assets/images/zommer/pdf.js",
              "src/assets/images/zommer/pdf.worker.js",
              "src/assets/images/zommer/leafletfunction.js"
            ]
          },
          "configurations": {
            "prod": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ]
            },
            "production": {
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "mega-able:build"
          },
          "configurations": {
            "prod": {
              "browserTarget": "mega-able:build:prod"
            },
            "production": {
              "browserTarget": "mega-able:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "mega-able:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "karmaConfig": "./karma.conf.js",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.spec.json",
            "scripts": [
              "src/assets/images/zommer/jquery.min.js",
              "src/assets/images/zommer/bootstrap.min.js",
              "src/assets/images/zommer/leaflet/dist/leaflet-src.js",
              "src/assets/images/zommer/leaflet/dist/leaflet.rotatedMarker.js",
              "src/assets/images/zommer/leaflet-toolbar/dist/leaflet.toolbar-src.js",
              "src/assets/images/zommer/leaflet-draw/dist/leaflet.draw-src.js",
              "src/assets/images/zommer/leaflet-draw-toolbar/dist/leaflet.draw-toolbar.js",
              "src/assets/images/zommer/color.js",
              "src/assets/images/zommer/pdf.js",
              "src/assets/images/zommer/pdf.worker.js",
              "src/assets/images/zommer/leafletfunction.js"
            ],
            "styles": [
              "./node_modules/bootstrap/dist/css/bootstrap.min.css",
              "./node_modules/ngx-bootstrap/datepicker/bs-datepicker.css",
              "node_modules/bootstrap/scss/bootstrap.scss",
              "node_modules/font-awesome-scss/scss/font-awesome.scss",
              "src/assets/images/zommer/leaflet/dist/leaflet.css",
              "src/assets/images/zommer/leaflet-draw-toolbar/dist/leaflet.draw-toolbar.css",
              "src/assets/images/zommer/leaflet-toolbar/dist/leaflet.toolbar.css",
              "src/assets/images/zommer/leaflet-draw/dist/leaflet.draw-src.css",
              "src/scss/style.scss"
            ],
            "assets": [
              "src/assets",
              "src/favicon.ico",
              "src/marker-icon.png",
              "src/marker-icon-2x.png"
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    },
    "mega-able-e2e": {
      "root": "e2e",
      "sourceRoot": "e2e",
      "projectType": "application",
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "./protractor.conf.js",
            "devServerTarget": "mega-able:serve"
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "e2e/tsconfig.e2e.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    }
  },
  "defaultProject": "mega-able",
  "schematics": {
    "@schematics/angular:component": {
      "prefix": "app",
      "styleext": "scss"
    },
    "@schematics/angular:directive": {
      "prefix": "app"
    }
  }
}

Below are all the various things I have tried based on Google searches. All the commands were run from a Git Bash window unless otherwise specified:

npm install -g @angular/cli
npm install @angular/cli
ng update @angular/cli
ng update
ng update @angular/cli @angular/core
ng build

The same issue about the NgModule metadata was still present. Next I tried the following:

npm remove webpack
npm install –save-dev @angular/cli@latest
npm cache clean –force
npm install
npm install –save-dev @angular/cli@latest
ng build

Issue persisted. Next:

Manually deleted the node_modules folder
npm install
ng build

Issue persisted. Next:

npm i -g @angular/cli@latest
Manually deleted node_modules folder
npm cache clear –force
npm cache verify
npm install
npm uninstall webpack
npm install –save-dev –save-exact @angular/cli@latest
ng build

Issue persisted. Next:

Manually deleted the node_modules folder
Manually deleted the package-lock.json file
npm install
ng build

Issue persisted. Next:

npm remove webpack
npm install –save-dev @angular/cli@latest
ng build

Issue persisted. Next:

npm cache clean –force
npm install
npm install –save-dev @angular/cli@latest
ng build

Issue persisted. Next:

Manually deleted the node_modules folder
Manually deleted the package-lock.json file
npm cache clean –force
npm install
npm install –save-dev @angular/cli@latest

Issue persisted. Next:

Opened project in Visual Studio code
In the terminal window ran ng s
Confirmed compilation error
Opened the app.component.ts file
Added a blank space, removed it, and saved
Project automatically recompiled
Successfully access the site at http://localhost:4200
Closed Visual Studio Code
From a Git Bash window ran ng serve
Project failed to compile
Re-opened Visual Studio Code
Ran ng serve from terminal window – error persisted
Resaved the app.component.ts file
Successfully accessed the site at http://localhost:4200
Restarted Visual Studio Code
Ran ng build from terminal window in Visual Studio Code – error returned
Resaved the app.component.ts file
Reran ng build command – error persisted

I'm at a lost of what else to try at this point and the dev team is off until at Tuesday for a holiday so any help or suggestions would be greatly appreciated as I'm under some time constraints. Thank you in advance for any help.

回答1:

I think by now, you've already read this article: https://github.com/angular/angular-cli/issues/8798

If not, please read it and notice that the TS also modified the package.json file manually to resolve his issue.

Since we have not seen the actual error message in your build, we cannot deduce if the issue has the same circumstance as the one in the link. So my idea for you to resolve your issue is to do the following:

Remove the npm_modules folder
Move the package.json file to a backup folder (in case we need it back) - so this should not exist in your project folder as it will get generated when you do the next steps
Do the npm install
Do ng build
Do ng serve

After the above or if you get it working again I suggest to view the difference between your old package.json and new package.json file and let us know what you observed as it is always good to give back.

回答2:

It should be @NgModule not just NgModule.

@NgModule({
      declarations: [
        AppComponent,
        AdminComponent,
        AdminComponent1,
        AuthComponent,
        BreadcrumbsComponent,
      ],
      imports: [
        BrowserModule,
        BrowserAnimationsModule,
        FormsModule,
        ReactiveFormsModule,
        AppRoutingModule,
        SharedModule,
        NgProgressModule,
        SimpleNotificationsModule.forRoot(),
        BrowserModule,


      ],
      providers: [MenuItems, ServicesProvider, AuthGuardService, SupperAdmin, AuthLoginService,  NgProgressModule, ConfigService],
      bootstrap: [AppComponent]
    })

Metadata is used to decorate a class so that it can configure the expected behavior of the class. We leverage the Typescript syntax and attach the classes with metadata using the decorator feature. To make a class as a component, we add the @Component decorator, as shown in the following code:

@Component({...})
export class FirstComponent {...}

回答3:

You have multiple trailing commas in your @NgModule's declarations and imports arrays. Delete those and see if that solves it.

回答4:

I was able to resolve the issue by updating the tsconfig.app.json file to include the files property and specifically listing app/app.module.ts in the array.

来源：https://stackoverflow.com/questions/55320181/no-ngmodule-metadata-found-for-appmodule-after-upgrade-from-angular-5-to-angul

标签

angular

angular7