webpack.config.js

const path = require("path");
const webpack = require("webpack");

module.exports = {
  entry: "./client/src/index.js",
  output: {
    filename: "bundle.js",
    path: path.resolve(__dirname, "public"),
  },
  module: {
    rules: [
      {
        test: /\.(js|jsx)$/,
        exclude: /node_modules/,
        use: {
          loader: "babel-loader",
          options: {
            presets: [
              "@babel/preset-env",
              ["@babel/preset-react", { runtime: "automatic" }],
            ],
          },
        },
      },
      {
        test: /\.css$/,
        use: ["style-loader", "css-loader"],
      },
      {
        test: /\.(png|jpe?g|gif|svg)$/,
        use: [
          {
            loader: "file-loader",
            options: {
              name: "[path][name].[ext]",
              esModule: false,
            },
          },
        ],
      },
    ],
  },
  resolve: {
    extensions: [".js", ".jsx"],
  },
  devServer: {
    contentBase: path.join(__dirname, "public"),
    port: 8080,
    proxy: {
      "/api": "http://localhost:3000",
    },
  },
  plugins: [
    new webpack.DefinePlugin({
      "process.env.REACT_APP_API_URL": JSON.stringify(
        "https://project-5389016526708021196.ts.r.appspot.com"
      ),
    }),
  ],
};