Webpack編譯失敗

Question

我剛剛開始學習React，並且正在Webpack中實現它。

這是我package.json中的devDependencies ：

"devDependencies": {
  "babel-core": "^6.25.0",
  "babel-loader": "^7.1.0",
  "babel-preset-es2015": "^6.24.1",
  "babel-preset-react": "^6.24.1",
  "react-hot-loader": "^1.3.1",
  "react-scripts": "1.0.7",
  "serve": "^5.2.4",
  "webpack": "^3.0.0",
  "webpack-dev-server": "^2.5.0"
},

這是我的webpack.config.js ：

module.exports = {
    context: __dirname + "/src",
    entry: './index.js',

    output: {
        filename: "index.js",
        path: __dirname + '/dist'
    },

    module: {
        loaders: [
        {
            test: /\.js$/,
            exclude: /node_modules/,
            loaders: ["react-hot-loader", "babel-loader"],
        }
        ],
    },
}

這是.babelrc

{
  "presets": [
    "es2015",
    "react"
  ]
}

現在當我運行npm start時會引發此錯誤

ERROR in ./src/index.css
Module parse failed: /home/tps/ReactApps/login-app/src/index.css Unexpected token (1:5)
You may need an appropriate loader to handle this file type.
| body {
|   margin: 0;
|   padding: 0;
@ ./src/index.js 21:0-22
@ multi ./node_modules/webpack-dev-server/client?http://localhost:8081 webpack/hot/dev-server ./index.js

ERROR in ./src/App.js
Module not found: Error: Can't resolve './notFound' in '/home/tps/ReactApps/login-app/src'
@ ./src/App.js 33:16-37
@ ./src/index.js
@ multi ./node_modules/webpack-dev-server/client?http://localhost:8081 webpack/hot/dev-server ./index.js

ERROR in ./src/App.css
Module parse failed: /home/tps/ReactApps/login-app/src/App.css Unexpected token (1:0)
You may need an appropriate loader to handle this file type.
| .App {
|   text-align: center;
| }
@ ./src/App.js 19:0-20
@ ./src/index.js
@ multi ./node_modules/webpack-dev-server/client?http://localhost:8081 webpack/hot/dev-server ./index.js

請幫我解決這個問題。

編輯1：

webpack.config.js

module.exports = {
  context: __dirname + "/src",
  entry: './index.js',

  output: {
    filename: "index.js",
    path: __dirname + '/dist'
  },

  module: {
    loaders: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loaders: ["react-hot-loader", "babel-loader"],
      }
    ],
    rules: [
      {
        test: /\.css$/,
        use: [ 'style-loader', 'css-loader' ]
      }
    ]
  },
}

package.json

 "devDependencies": {
  "babel-core": "^6.25.0",
  "babel-loader": "^7.1.0",
  "babel-preset-es2015": "^6.24.1",
  "babel-preset-react": "^6.24.1",
  "css-loader": "^0.28.4",
  "react-hot-loader": "^1.3.1",
  "react-scripts": "1.0.7",
  "serve": "^5.2.4",
  "style-loader": "^0.18.2",
  "webpack": "^3.0.0",
  "webpack-dev-server": "^2.5.0"
},

Answer 1

您需要在Webpack配置中添加css-loader才能導入css文件。

npm install --save-dev css-loader style-loader

並將以下內容添加到webpack配置中的loaders數組中：

{
  test: /\.css$/,
  loader: 'style-loader!css-loader'
}

檢查此以獲取更多信息： https : //github.com/webpack-contrib/css-loader 。

編輯：您正在使用加載程序和規則。 他們基本上是同一件事。 檢查此以獲取更多信息： https : //webpack.js.org/guides/migrating/#module-loaders-is-now-module-rules

試試這個webpack配置：

module.exports = {
  context: __dirname + "/src",
  entry: './index.js',

  output: {
    filename: "index.js",
    path: __dirname + '/dist'
  },

  module: {
    loaders: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loaders: ["react-hot-loader", "babel-loader"],
      },       
      {
        test: /\.css$/,
        use: [ 'style-loader', 'css-loader' ]
      }
    ]
  },
}