错误 NG6002：出现在 AppModule 的 NgModule.imports 中，但无法解析为 NgModule 类

Question

第一次使用 firestore 时出现此错误。根据我的研究，这似乎是 Ivy 的问题。我没有很多修改 tsconfig.app.json 的经验，这是我被指出的方向，遵循其他答案。

我能够从原始项目中修改的唯一一件事是使用 Angular Fire 6 而不是 5，这是我最初按照教程所做的。

这是 package.json：

{
  "name": "language",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "~9.0.1",
    "@angular/cdk": "^9.0.0",
    "@angular/common": "~9.0.1",
    "@angular/compiler": "~9.0.1",
    "@angular/core": "~9.0.1",
    "@angular/fire": "^6.0.0-rc.1",
    "@angular/flex-layout": "^9.0.0-beta.29",
    "@angular/forms": "~9.0.1",
    "@angular/material": "^9.0.0",
    "@angular/platform-browser": "~9.0.1",
    "@angular/platform-browser-dynamic": "~9.0.1",
    "@angular/router": "~9.0.1",
    "firebase": "^7.8.2",
    "rxjs": "~6.5.4",
    "rxjs-compat": "^6.5.4",
    "tslib": "^1.10.0",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.900.2",
    "@angular/cli": "~9.0.2",
    "@angular/compiler-cli": "~9.0.1",
    "@angular/language-service": "~9.0.1",
    "@types/node": "^12.11.1",
    "@types/jasmine": "~3.3.8",
    "@types/jasminewd2": "~2.0.3",
    "codelyzer": "^5.1.2",
    "jasmine-core": "~3.4.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.1.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.15.0",
    "typescript": "~3.7.5",
    "@angular-devkit/architect": "^0.900.0-0 || ^0.900.0",
    "firebase-tools": "^7.12.1",
    "fuzzy": "^0.1.3",
    "inquirer": "^6.2.2",
    "inquirer-autocomplete-prompt": "^1.0.1"
  }
}

angular.json

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "language": {
      "projectType": "application",
      "schematics": {
        "@schematics/angular:component": {
          "style": "scss"
        }
      },
      "root": "",
      "sourceRoot": "src",
      "prefix": "app",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/language",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.app.json",
            "aot": true,
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "./node_modules/@angular/material/prebuilt-themes/deeppurple-amber.css",
              "src/styles.scss"
            ],
            "scripts": []
          },
          "configurations": {
            "production": {
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "budgets": [
                {
                  "type": "initial",
                  "maximumWarning": "2mb",
                  "maximumError": "5mb"
                },
                {
                  "type": "anyComponentStyle",
                  "maximumWarning": "6kb",
                  "maximumError": "10kb"
                }
              ]
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "language:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "language:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "language:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.spec.json",
            "karmaConfig": "karma.conf.js",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "./node_modules/@angular/material/prebuilt-themes/deeppurple-amber.css",
              "src/styles.scss"
            ],
            "scripts": []
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "tsconfig.app.json",
              "tsconfig.spec.json",
              "e2e/tsconfig.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        },
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "e2e/protractor.conf.js",
            "devServerTarget": "language:serve"
          },
          "configurations": {
            "production": {
              "devServerTarget": "language:serve:production"
            }
          }
        },
        "deploy": {
          "builder": "@angular/fire:deploy",
          "options": {}
        }
      }
    }
  },
  "defaultProject": "language"
}

tsconfig.app.json

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "outDir": "./out-tsc/app",
    "types": [],
  
  },
  "files": [
    "src/main.ts",
    "src/polyfills.ts"
  ],
  "include": [
    "src/**/*.d.ts"
  ],
  "exclude": [
    "src/test.ts",
    "src/**/*.spec.ts"
  ]
}

谢谢！

Answer 1

您的模块尚未由 Angular 服务器加载node ng serve，因此请重新启动您的服务器，以便服务器加载您刚刚添加的模块@NgModule app.module.ts

Answer 2

当您在imports: []而不是中添加组件声明时会显示此错误declarations: []，例如：

declarations: [
  AppComponent,
],
imports: [
  BrowserModule,
  AppRoutingModule,
  SomeComponent <-----------wrong
],

Answer 3

当我犯了导入MatSnackBar而不是MatSnackBarModulein的愚蠢错误时，我收到了这个错误app.module.ts。

Answer 4

我通过service在imports数组中添加一个而不是数组而犯了一个错误providers。

@NgModule({
  imports: [
    MyService // wrong here
  ],
  providers: [
    MyService // should add here
  ]
})
export class AppModule { }

Angular说你需要添加Injectables到providers数组中。

Answer 5

通过根据文档选择退出常春藤来修复它。

https://angular.io/guide/ivy

更改 tsconfig.app.json 以选择退出 Ivy。

"enableIvy": false

Answer 6

这对我有用：

1）停止ng服务器

2）重新安装你的包

npm install your-package-name

3）再次运行

ng serve

Answer 7

有时，当您在项目中更改/更新@NgModule时，项目会被编译但更改不会得到反映。所以，如果你没有得到它，重新启动一次以获得预期的结果。 服务

Answer 8

尝试清除缓存

1. npm cache clean --force
2. npm install

Answer 9

我的错误：我错过了Module我写的部分

import { MatPaginator } from '@angular/material/paginator';

代替

import { MatPaginatorModule } from '@angular/material/paginator';

在我的模块中。

Answer 10

对我来说，我在 Ubuntu 下工作

如果我将sudo与ng 一起使用，错误就会消失

sudo ng build
sudo ng serve

更好的解决方案是使用以下命令授予当前用户对当前文件夹所需的权限：

sudo chown -R `whoami` ./

这样做将使您无需 sudo 即可运行 ng 命令。

Answer 11

当使用错误的导入（例如使用自动导入时）时，也会发生这种情况。我们以 MatTimePickerModule 为例。这将给出类似于问题中描述的错误消息：

import { NgxMatTimepickerModule } from '@angular-material-components/datetime-picker/lib/timepicker.module';

这应该是

import { NgxMatTimepickerModule } from '@angular-material-components/datetime-picker';

Answer 12

在我来说，我通过设置“strictTemplates”回到这个解决假的tsconfig.json

{
  "compilerOptions": {
    // ...
  },
  "angularCompilerOptions": {
    "strictTemplates": false
  }
}

我之前已将其设置为true以防止 VStudio 弹出窗口显示：