Question

我们的开发团队最近将Angular 5项目更新为Angular7。我已经下载了存储库，并尝试构建源代码，但是当我运行 ng build 命令时， 找不到“ AppModule”的NgModule元数据中的错误。

如果我运行 ng --version 命令，则会显示以下内容：

Angular CLI：7.3.6
节点：11.10.0
操作系统：win32 x64
角度：7.2.10

app.module.ts 文件是：

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 { }

和 main.ts 文件是：

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));

index.html如下：

<!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>

和 angular.json 文件：

{
  "$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"
    }
  }
}

以下是我根据Google搜索尝试过的所有内容。除非另有说明，否则所有命令都是从Git Bash窗口运行的：

npm install -g @ angular / cli
npm install @ angular / cli
ng更新@ angular / cli
ng更新
ng更新@ angular / cli @ angular / core
ng构建

关于NgModule元数据的相同问题仍然存在。接下来，我尝试了以下操作：

npm删除webpack
npm install –save-dev @ angular / cli @ latest
npm缓存清理–force
npm安装
npm install –save-dev @ angular / cli @ latest
ng构建

问题仍然存在。下一个：

手动删除node_modules文件夹
npm安装
ng构建

问题仍然存在。下一个：

npm i -g @ angular / cli @ latest
手动删除的node_modules文件夹
npm缓存清除–force
npm缓存验证
npm安装
npm卸载webpack
npm install –save-dev –save-exact @ angular / cli @ latest
ng构建

问题仍然存在。下一个：

手动删除node_modules文件夹
手动删除package-lock.json文件
npm安装
ng构建

问题仍然存在。下一个：

npm删除webpack
npm install –save-dev @ angular / cli @ latest
ng构建

问题仍然存在。下一个：

npm缓存清理–force
npm安装
npm install –save-dev @ angular / cli @ latest
ng构建

问题仍然存在。下一个：

手动删除node_modules文件夹
手动删除package-lock.json文件
npm缓存清理–force
npm安装
npm install –save-dev @ angular / cli @ latest

问题仍然存在。下一个：

在Visual Studio代码中打开项目
在终端窗口中运行
已确认编译错误
打开app.component.ts文件
添加空格，将其删除并保存
项目自动重新编译
成功访问http://localhost:4200上的站点
已关闭的Visual Studio代码
从Git Bash窗口运行服务
项目无法编译
重新打开Visual Studio代码
从终端窗口投放服务-错误持续存在
重新保存app.component.ts文件
已成功访问http://localhost:4200上的站点
重新启动Visual Studio代码
在Visual Studio Code的终端窗口中进行构建-返回错误
重新保存app.component.ts文件
重新生成命令-错误仍然存在

我现在还不知道要尝试什么，开发团队要休假到星期二休假，所以任何帮助或建议都会受到我的帮助，因为我受到时间的限制。预先感谢您的帮助。

Answer 1

我认为，到目前为止，您已经阅读了这篇文章：https://github.com/angular/angular-cli/issues/8798

如果没有，请阅读并注意TS还手动修改了package.json文件以解决他的问题。

由于我们没有在您的构建中看到实际的错误消息，因此我们无法推断出问题是否与链接中的情况相同。因此，我为您解决问题的想法是执行以下操作：

删除npm_modules文件夹
将package.json文件移动到备份文件夹（以防我们需要它）-因此该文件不应存在于您的项目文件夹中，因为在进行下一步时会生成该文件
执行npm安装
进行构建
服侍

在上述操作之后，或者如果您再次使用它，我建议您查看旧的package.json文件与新的package.json文件之间的区别，并让我们知道您的观察，因为始终可以提供回报。

Answer 2

只要在tsconfig.app.json（或定义tsconfig设置的任何地方）对某人有帮助的情况下，此Angular编译器选项（设置为true时）都会导致各种元数据失败，即使未在{中直接引用文件{1}}元数据（只需将文件导入NgModule就足够了。）

单个文件/类型可以用index.ts注释取消显示，或者...您可以检查以确保// @dynamic设置为false：

tsconfig.json：

strictMetadataEmit

就我而言，在某些时候将其设置为true，因此Angular在与模块defs无关的类的元数据上失败。将其设置为"angularCompilerOptions": { "strictMetadataEmit": false }（这是默认设置，如此处指定的https://angular.io/guide/angular-compiler-options）已解决该问题。

Answer 3

@NgModule's声明中有多个结尾逗号，并导入数组。删除那些，看看是否能解决。

Answer 4

应该是@NgModule，而不仅仅是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]
    })

元数据用于装饰类，以便它可以配置类的预期行为。我们利用Typescript语法，并使用装饰器功能为类附加元数据。为了使一个类成为一个组件，我们添加了@Component装饰器，如以下代码所示：

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

Answer 5

我能够通过更新 tsconfig.app.json 文件以包括 files 属性，并在阵列中明确列出app/app.module.ts来解决该问题。

从Angular 5升级到Angular 7后，找不到“ AppModule”的NgModule元数据

5 个答案: