const path = require("path");
const webpack = require("webpack");
const HtmlWebpackPlugin = require("html-webpack-plugin"); //生成HTML文件
const eslintFormatter = require("react-dev-utils/eslintFormatter");

module.exports = {
  entry: path.join(__dirname, "examples/src/index.js"), //入口文件
  output: {
    filename: "[name].bundle.js" //输出文件名
  },
  mode: "development",
  devtool: "cheap-module-source-map",
  resolve: {
    extensions: [".js", ".jsx", "tsx", "ts"]
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        loader: "babel-loader",
        include: /src/,
        exclude: /node_modules/,
        options: {
          plugins: [
            [
              "import",
              { libraryName: "antd", libraryDirectory: "es", style: "css" }
            ]
          ], //antd组件按需引入
          cacheDirectory: true
        }
      },
      {
        test: /\.tsx?$/,
        loader: "ts-loader",
        exclude: /node_modules/
      },
      {
        test: /\.(js|jsx)$/,
        enforce: "pre",
        use: [
          {
            options: {
              formatter: eslintFormatter,
              eslintPath: require.resolve("eslint")
            },
            loader: require.resolve("eslint-loader")
          }
        ],
        exclude: /node_modules/
      },
      {
        test: /\.scss|css$/,
        use: [
          { loader: "style-loader" },
          { loader: "css-loader" },
          { loader: "sass-loader" }
        ]
      },
      {
        test: /\.(png|svg|jpg|gif)$/i,
        use: [
          {
            loader: "url-loader",
            options: {
              limit: 10000,
              mimetype: "image/png",
              fallback: "responsive-loader"
            }
          }
        ]
      },
      {
        test: /\.(woff|woff2|svg|tff|eot)$/i,
        use: [
          {
            loader: "url-loader",
            options: {
              limit: 10000,
              fallback: "responsive-loader"
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: path.join(__dirname, "examples/index.html"),
      filename: "./index.html"
    }),
    new webpack.HotModuleReplacementPlugin() //配合 webpack-dev-server启用HMR
  ],
  devServer: {
    port: 3001,
    open: true,
    hot:true,
    historyApiFallback: true, //不跳转，在开发单页应用时非常有用,它依赖于HTML5 history API, 如果设置为true,所有的跳转，将指向index.html
    contentBase: path.join(__dirname, "public"), //本地服务器所加载的页面所在的目录
    proxy: {
      //凡是 '/api' 开头的http请求，都会被代理到localhost:3000上，实际上后端做了一次转发 ，后端去3000端口拿到数据后，又返回的，这里并不是真正的服务，真正的服务在3000端口上
      "/api": {
        target: "http://localhost:3000",
        secure: false
      }
    }
  }
};