我們應該如何在 Angular 應用程序中正確處理加載 CSS 文件？

Question

錯誤

./node_modules/bootstrap/dist/css/bootstrap.css:8:0 - Error: Module parse failed: Unexpected token (8:0)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders
|  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
|  */
> :root {
|   --bs-blue: #0d6efd;
|   --bs-indigo: #6610f2;

問題

當我嘗試導入bootstrap.css時，我不斷收到此錯誤。 我看過的一些解決方案涉及在 webpack.config.js 中添加一個 css 加載器，但是由於我使用angular-cli安裝了我的應用程序，所以我看不到它。

角.json

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "ECS2": {
      "projectType": "application",
      "schematics": {},
      "root": "",
      "sourceRoot": "src",
      "prefix": "app",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/ecs2",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "tsconfig.app.json",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],
            "styles": [
              "./node_modules/@angular/material/prebuilt-themes/indigo-pink.css",
              "src/styles.css",
              "./node_modules/bootstrap/dist/css/bootstrap.min.css"

            ],
            "scripts": [
              "./node_modules/jquery/dist/jquery.min.js",
              "./node_modules/bootstrap/dist/js/bootstrap.min.js",
              "./node_modules/popper.js/dist/popper.min.js"]
          },
          "configurations": {
            "production": {
              "budgets": [
                {
                  "type": "initial",
                  "maximumWarning": "500kb",
                  "maximumError": "1mb"
                },
                {
                  "type": "anyComponentStyle",
                  "maximumWarning": "2kb",
                  "maximumError": "4kb"
                }
              ],
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ],
              "outputHashing": "all"
            },
            "development": {
              "buildOptimizer": false,
              "optimization": false,
              "vendorChunk": true,
              "extractLicenses": false,
              "sourceMap": true,
              "namedChunks": true
            }
          },
          "defaultConfiguration": "production"
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "configurations": {
            "production": {
              "browserTarget": "ECS2:build:production"
            },
            "development": {
              "browserTarget": "ECS2:build:development"
            }
          },
          "defaultConfiguration": "development"
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "ECS2: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/indigo-pink.css",
              "src/styles.css",
              "./node_modules/bootstrap/dist/css/bootstrap.min.css"
            ],
            "scripts": [
              "./node_modules/jquery/dist/jquery.min.js",
              "./node_modules/bootstrap/dist/js/bootstrap.min.js",
              "./node_modules/popper.js/dist/popper.min.js"]
          }
        }
      }
    }
  }
}

tsconfig.json

/* To learn more about this file see: https://angular.io/config/tsconfig. */
{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "noImplicitOverride": true,
    "noPropertyAccessFromIndexSignature": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es2020",
    "module": "es2020",
    "lib": [
      "es2020",
      "dom"
    ]
  },
  "angularCompilerOptions": {
    "enableI18nLegacyMessageIdFormat": false,
    "strictInjectionParameters": true,
    "strictInputAccessModifiers": true,
    "strictTemplates": true
  }
}

包.json

{
  "name": "ecs2",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "watch": "ng build --watch --configuration development",
    "test": "ng test"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^14.0.0",
    "@angular/cdk": "^14.0.2",
    "@angular/common": "^14.0.0",
    "@angular/compiler": "^14.0.0",
    "@angular/core": "^14.0.0",
    "@angular/forms": "^14.0.0",
    "@angular/material": "^14.0.2",
    "@angular/platform-browser": "^14.0.0",
    "@angular/platform-browser-dynamic": "^14.0.0",
    "@angular/router": "^14.0.0",
    "bootstrap": "^5.1.3",
    "jquery": "^3.6.0",
    "popper.js": "^1.16.1",
    "rxjs": "~7.5.0",
    "tslib": "^2.3.0",
    "zone.js": "~0.11.4"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "^14.0.1",
    "@angular/cli": "~14.0.1",
    "@angular/compiler-cli": "^14.0.0",
    "@types/jasmine": "~4.0.0",
    "jasmine-core": "~4.1.0",
    "karma": "~6.3.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage": "~2.2.0",
    "karma-jasmine": "~5.0.0",
    "karma-jasmine-html-reporter": "~1.7.0",
    "style-loader": "^3.3.1",
    "typescript": "~4.7.2"
  }
}

我正在像這樣導入引導程序：

import { Component} from '@angular/core';



import '../../node_modules/bootstrap/dist/css/bootstrap.css';


import '../styles.css';

import { Inject, enableProdMode, NgModule } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { BrowserModule } from '@angular/platform-browser';



@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css', '../styles.css']
})



export class AppComponent {
  ...
}

嘗試的解決方案

• 嘗試安裝其他版本的引導程序，同樣的錯誤
• 目前正在嘗試 custom-webpack builder，但不確定這是否可行。

Answer 1

在 Angular 應用程序中，您不應該像在 AppComponent 文件中提到的那樣加載 CSS 文件。

您已經在 angular.json 中正確添加了引導文件，這足以將其包含在 angular 項目中。

請從 Appcomponent 文件中刪除導入並嘗試構建它。 我已經構建了幾個沒有任何問題的 Angular 應用程序（通過 Angular CLI 創建）。

請讓我們知道結果。