webpack.config.cjs

const path = require('path');
const dotenv = require('dotenv');
const webpack = require('webpack');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');

const network =
  process.env.DFX_NETWORK ||
  (process.env.NODE_ENV === 'production' ? 'ic' : 'local');

// Replace this value with the ID of your local Internet Identity canister
const env = dotenv.config().parsed;
const LOCAL_II_CANISTER = `http://${
  env && process.env.LOCAL_II_CANISTER_ID
}.localhost:8000/#authorize`;
const LOCAL_NFT_CANISTER_ID = env ? process.env.LOCAL_NFT_CANISTER_ID : '';

function initCanisterEnv() {
  let localCanisters, prodCanisters;
  try {
    localCanisters = require(path.resolve(
      '.dfx',
      'local',
      'canister_ids.json'
    ));
  } catch (error) {
    console.log('No local canister_ids.json found. Continuing production');
  }
  try {
    prodCanisters = require(path.resolve('canister_ids.json'));
  } catch (error) {
    console.log('No production canister_ids.json found. Continuing with local');
  }

  const canisterConfig = network === 'local' ? localCanisters : prodCanisters;

  return Object.entries(canisterConfig).reduce((prev, current) => {
    const [canisterName, canisterDetails] = current;
    prev[canisterName.toUpperCase() + '_CANISTER_ID'] =
      canisterDetails[network];
    return prev;
  }, {});
}
const canisterEnvVariables = initCanisterEnv();

const isDevelopment = process.env.NODE_ENV !== 'production';

const frontendDirectory = 'NFTBarter_assets';

const asset_entry = path.join('src', frontendDirectory, 'src', 'index.html');

module.exports = {
  target: 'web',
  mode: isDevelopment ? 'development' : 'production',
  entry: {
    // The frontend.entrypoint points to the HTML file for this build, so we need
    // to replace the extension to `.js`.
    index: path.join(__dirname, asset_entry).replace(/\.html$/, '.tsx'),
  },
  devtool: isDevelopment ? 'source-map' : false,
  optimization: {
    minimize: !isDevelopment,
    minimizer: [new TerserPlugin()],
  },
  resolve: {
    extensions: ['.js', '.ts', '.jsx', '.tsx'],
    fallback: {
      assert: require.resolve('assert/'),
      buffer: require.resolve('buffer/'),
      events: require.resolve('events/'),
      stream: require.resolve('stream-browserify/'),
      util: require.resolve('util/'),
    },
  },
  output: {
    filename: 'index.js',
    path: path.join(__dirname, 'dist', frontendDirectory),
  },
  module: {
    rules: [
      {
        test: /^(?!.*\.test\.ts$).*\.(ts|tsx|jsx)$/,
        loader: 'ts-loader',
      },
      { test: /\.css$/, use: ['style-loader', 'css-loader'] },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: path.join(__dirname, asset_entry),
      cache: false,
    }),
    new CopyPlugin({
      patterns: [
        {
          from: path.join(__dirname, 'src', frontendDirectory, 'assets'),
          to: path.join(__dirname, 'dist', frontendDirectory),
        },
      ],
    }),
    new webpack.EnvironmentPlugin({
      NODE_ENV: 'development',
      DFX_NETWORK: network,
      LOCAL_II_CANISTER,
      LOCAL_NFT_CANISTER_ID,
      ...canisterEnvVariables,
    }),
    new webpack.ProvidePlugin({
      Buffer: [require.resolve('buffer/'), 'Buffer'],
      process: require.resolve('process/browser'),
    }),
  ],
  // proxy /api to port 8000 during development
  devServer: {
    historyApiFallback: true,
    proxy: {
      '/api': {
        target: 'http://localhost:8000',
        changeOrigin: true,
        pathRewrite: {
          '^/api': '/api',
        },
      },
    },
    hot: true,
    watchFiles: [path.resolve(__dirname, 'src', frontendDirectory)],
    liveReload: true,
  },
};