javascript - React + Webpack 不解析文件加载器

Question

我试图将一个典型的 HTML 网站迁移到一个“轻型”React 应用程序。因此，我安装了 React，但没有使用 create-react-app。

我配置了Webpack，然后file-loader在 CSS 文件中使用字体。但编译时我仍然遇到错误，因为它无法识别文件加载器(我也尝试过 ttf-loader 和 url-loader )。

我一直在阅读类似的问题，但他们的解决方案都不适用于这种情况。

项目的目录结构如下所示:

• webpack.config.js
• 源代码
  • index.js
  • CSS
    • 样式.css
  • 字体
    • pgroofrunners.ttf

这是我当前的 Webpack 配置(webpack.config.js):

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');

module.exports = {
  entry: path.resolve(__dirname, 'src/index'),
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.js'
  },
  module: {
    rules: [
        {
            test: /\.js$/,
            include: path.resolve(__dirname, 'src'),
            use: ['babel-loader']
        },
        {
            test: /\.(woff(2)?|ttf|eot|svg)(\?v=\d+\.\d+\.\d+)?$/,
            use: [
              {
                loader: 'file-loader',
                options: {
                  name: '[name].[ext]',
                  outputPath: 'fonts/'
                }
              }
            ]
          }
    ]
  },
  devServer: {
    contentBase:  path.resolve(__dirname, 'dist'),
    port: 9000
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "src/index.html"
    })
  ]
};

因此，当我运行 webpack-dev-server --modedevelopment 时，它会编译，但随后崩溃并出现以下错误:

C:\Web\pwa-static2>yarn serve
yarn run v1.17.3
$ webpack-dev-server --mode development
i ｢wds｣: Project is running at http://localhost:9000/
i ｢wds｣: webpack output is served from /
i ｢wds｣: Content not from webpack is served from C:\Web\app1\dist
× ｢wdm｣: Hash: 77bf7ce09014ddcd0764
Version: webpack 4.41.5
Time: 3901ms
Built at: 2020-01-27 13:35:42
     Asset      Size  Chunks             Chunk Names
 bundle.js  1.43 MiB    main  [emitted]  main       
index.html  2.75 KiB          [emitted]  
Entrypoint main = bundle.js
[0] multi (webpack)-dev-server/client?http://localhost:9000 ./src/index 40 bytes {main} [built]
[./node_modules/ansi-html/index.js] 4.16 KiB {main} [built]
[./node_modules/react-dom/index.js] 1.33 KiB {main} [built]
[./node_modules/react/index.js] 190 bytes {main} [built]
[./node_modules/strip-ansi/index.js] 161 bytes {main} [built]
[./node_modules/webpack-dev-server/client/index.js?http://localhost:9000] (webpack)-dev-server/client?http://localhost:9000 4.29 KiB {main} [built]  
[./node_modules/webpack-dev-server/client/overlay.js] (webpack)-dev-server/client/overlay.js 3.51 KiB {main} [built]
[./node_modules/webpack-dev-server/client/socket.js] (webpack)-dev-server/client/socket.js 1.53 KiB {main} [built]
[./node_modules/webpack-dev-server/client/utils/createSocketUrl.js] (webpack)-dev-server/client/utils/createSocketUrl.js 2.91 KiB {main} [built]     
[./node_modules/webpack-dev-server/client/utils/log.js] (webpack)-dev-server/client/utils/log.js 964 bytes {main} [built]
[./node_modules/webpack-dev-server/client/utils/reloadApp.js] (webpack)-dev-server/client/utils/reloadApp.js 1.59 KiB {main} [built]
[./node_modules/webpack-dev-server/client/utils/sendMessage.js] (webpack)-dev-server/client/utils/sendMessage.js 402 bytes {main} [built]
[./node_modules/webpack/hot sync ^\.\/log$] (webpack)/hot sync nonrecursive ^\.\/log$ 170 bytes {main} [built]
[./src/css/style.css] 335 bytes {main} [built] [failed] [1 error]
[./src/index.js] 207 bytes {main} [built]
    + 30 hidden modules

ERROR in ./src/css/style.css 1:0
Module parse failed: Unexpected character '@' (1:0)
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
> @font-face {
|     font-family: pgRoofRunners;
|     src: url("../fonts/pgroofrunners.ttf");
 @ ./src/index.js 3:0-25
Child html-webpack-plugin for "index.html":
     1 asset
    Entrypoint undefined = index.html
    [./node_modules/html-webpack-plugin/lib/loader.js!./src/index.html] 2.99 KiB {0} [built]
    [./node_modules/lodash/lodash.js] 528 KiB {0} [built]
    [./node_modules/webpack/buildin/global.js] (webpack)/buildin/global.js 472 bytes {0} [built]
    [./node_modules/webpack/buildin/module.js] (webpack)/buildin/module.js 497 bytes {0} [built]
i ｢wdm｣: Failed to compile.

I guess this is what is crashing the app in **src/css/style.css*:

@font-face {
    font-family: pgRoofRunners;
    src: url("../fonts/pgroofrunners.ttf");
}

我该如何解决这个问题？

Answer 1

看起来您正在使用 webpack 将 CSS 导入到某个地方。为了理解 CSS，webpack 还需要一个加载器。通常你的 module.rules 中有这样的东西:

{
  test: /\.css$/,
  use: [MiniCssExtractPlugin.loader, 'css-loader']
}

或者，如果您不使用MiniCssExtractorPlugin:

{
  test: /\.css$/,
  use: ['style-loader', 'css-loader']
}