模块生成错误失败(来自./node_modules/@angular-devkit/build-angular/node_modules/mini-css-extract-plugin/dist/loader.js) )

Question

当我运行ng build --prod时，会得到这个错误。它可以服务没有错误，但它不能建立。我用它来接力

ERROR in Module build failed (from ./node_modules/@angular-devkit/build-angular/node_modules/mini-css-extract-plugin/dist/loader.js):       
TypeError: Cannot read property 'replace' of undefined
    at normalizeBackSlashDirection (C:\project\tea supply chain mangement system\test2\node_modules\webpack\lib\RequestShortener.js:16:17)  
    at new RequestShortener (C:\project\tea supply chain mangement system\test2\node_modules\webpack\lib\RequestShortener.js:26:15)
    at new Compiler (C:\project\tea supply chain mangement system\test2\node_modules\webpack\lib\Compiler.js:195:27)
    at Compiler.createChildCompiler (C:\project\tea supply chain mangement system\test2\node_modules\webpack\lib\Compiler.js:548:25)        
    at Compilation.createChildCompiler (C:\project\tea supply chain mangement system\test2\node_modules\webpack\lib\Compilation.js:2100:24) 
    at Object.pitch (C:\project\tea supply chain mangement system\test2\node_modules\@angular-devkit\build-angular\node_modules\mini-css-extract-plugin\dist\loader.js:89:43)

我的依赖关系：

"dependencies": {
  "@agm/core": "^1.1.0",
    "@angular/animations": "8.2.14",
    "@angular/cdk": "^8.2.3",
    "@angular/common": "8.2.14",
    "@angular/compiler": "8.2.14",
    "@angular/core": "^8.2.14",
    "@angular/http": "^7.2.15",
    "@angular/material": "^8.2.3",
    "@angular/router": "8.2.14",
       ....
    "web3": "^1.2.4",
    "zone.js": "0.9.1"   
},   
   "devDependencies": {  
   "@angular-builders/custom-webpack": "^8.4.1",
    "@angular-builders/dev-server": "^7.3.1",
    "@angular-devkit/build-angular": "^0.803.21",
    "@angular-devkit/architect": "^0.803.21",
    "@angular/cli": "^8.3.21",
    "@angular/compiler-cli": "^8.2.14",
    "@angular/language-service": "8.2.14",
    .....
  }

如何解决这个错误？

Answer 1

在我的例子中，有些css不能正常工作，这就是为什么在我逐一检查时找到这个error.it的原因。因为这个错误隐藏了其他错误。

Answer 2

https://github.com/webpack-contrib/mini-css-extract-plugin/issues/186上的讨论包括这样一条语句:当任何组件具有数组值大于1的styleUrls属性时，都会发生此错误。

我在一个应用程序中验证了这一点，该应用程序将此属性的值降为长度为1的数组，从而使错误消失。

Answer 3

我犯了这个错误，因为我在angular.json文件中放置了"“is样式列表。我想要添加css文件并开始输入，但我采用了另一种方式，我把这个"“留在了那里。

"styles": [
  "./node_modules/@angular/material/prebuilt-themes/indigo-pink.css",
  "src/styles.css",
  "node_modules/bootstrap/dist/css/bootstrap.min.css",
  "" /* <--- this line breaks everything */
],