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

module.exports = () => {
  const env = dotenv.config().parsed;
  const envKeys = Object.keys(env).reduce((prev, next) => {
    prev[`process.env.${next}`] = JSON.stringify(env[next]);
    return prev;
  }, {});

  return {
    entry: "./src/index.tsx",
    target: "web",
    mode: "development",
    module: {
      rules: [
        {
          test: /\.(ts|tsx)$/,
          loader: "ts-loader",
        },
        {
          enforce: "pre",
          test: /\.js$/,
          loader: "source-map-loader",
        },
        {
          test: /\.(png|svg|jpg|gif|mp3)$/,
          use: ["file-loader"],
        },
        { test: /\.css$/, use: ["css-loader"] },
        {
          test: /\.(woff(2)?|ttf|eot)(\?v=\d+\.\d+\.\d+)?$/,
          use: [
            {
              loader: "file-loader",
              options: {
                name: "[name].[ext]",
                outputPath: "fonts/",
              },
            },
          ],
        },
      ],
    },
    resolve: {
      modules: [path.resolve(__dirname, "src"), "node_modules"],
      extensions: ["*", ".tsx", ".ts", ".js", ".jsx", ".json"],
    },
    output: {
      filename: "bundle.js",
      path: path.resolve(__dirname, "build"),
      publicPath: "/",
    },
    devServer: {
      historyApiFallback: true,
    },
    plugins: [
      new HtmlWebpackPlugin({
        template: path.resolve(__dirname, "src", "index.html"),
        segmentKey: `${process.env.SEGMENT_PUBLIC_KEY}`,
      }),
      new webpack.DefinePlugin(envKeys),
    ],
  };
};