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

这个问题将通过在package.json中添加下面的postinstall脚本来解决。

它将在npm安装后运行。

"scripts": {
   "postinstall": "ngcc"
}

添加以上代码后,运行npm install

当我升级到Angular 9+时,这是可行的

其他回答

根据文档,修正了选择退出常春藤的问题。

https://angular.io/guide/ivy

更改tsconfig.app.json以选择退出Ivy。

"enableIvy": false

当使用错误的导入(例如使用autoimport)时,也会发生这种情况。让我们以MatTimePickerModule为例。这将给出一个错误信息,类似于问题中描述的错误信息:

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

这应该是

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

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

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.

我犯了一个错误,将服务添加到imports数组而不是providers数组中。

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

Angular说你需要将注入对象添加到providers数组中。