第一次使用firestore,我得到这个错误。根据我的研究,这似乎是艾薇的问题。我没有太多修改tsconfig.app的经验。json,这是我所指向的方向,然后是其他答案。

我唯一能从最初的项目中修改的是使用Angular Fire 6而不是5,我最初是按照教程做的。

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!


当前回答

当我在app.module.ts中导入MatSnackBar而不是MatSnackBarModule时,我得到了这个错误。

其他回答

有时候,当你在项目中更改/更新@NgModule时,项目会被编译,但更改不会被反映出来。所以,如果你没有得到预期的结果,重新启动一次就可以了。 ng服务

此错误显示当您在imports中添加组件声明:[]而不是声明:[]时,例如:

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

我试图添加一个自定义管道到我的共享模块,我已经在导入和导出中添加了它。这就是为什么它会引起这个问题。

我通过将自定义管道添加到declarations:[], exports:[]和providers:[]中解决了这个问题。

我通过以下代码解决了这个问题:

@NgModule({

 declarations: [
   myCustomPipe,
 ],

 exports: [
   myCustomPipe,
 ],

 providers: [
  myCustomPipe,
 ]

})

当您导入一些在组件中没有使用的mat组件时,也会发生这种情况。

if you have all mat components imported in you app.module.ts you have imported some mat components and you have not used any of the components in imports and exports arrays in app.module.ts means no issues no errors will throw works fine. if you create feature module for that let say by ng g m material this will create material.module.ts filename. now we have to copy all mat import statements to newly created feature module before copying keep in mind is any import statements grayed out or not(some indication IDE shows this name is not used). if grayed out means you have to remove those names then copy and paste it to MaterialModule imports and exports array. that's solve.

这对我来说很管用:

1)停止ng服务器

2)重新安装软件包

npm install your-package-name

3)重新运行

ng serve