webpack.config.js

const path = require('path')
const webpack = require('webpack')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const TerserPlugin = require('terser-webpack-plugin')
const Dotenv = require('dotenv-webpack')

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 network =
    process.env.DFX_NETWORK ||
    (process.env.NODE_ENV === 'production' ? 'ic' : '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 = 'hackathon_finals_frontend'

const frontend_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, frontend_entry).replace(/\.html$/, '.jsx'),
  },
  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),
  },

  // Depending in the language or framework you are using for
  // front-end development, add module loaders to the default
  // webpack configuration. For example, if you are using React
  // modules and CSS as described in the "Adding a stylesheet"
  // tutorial, uncomment the following lines:
  module: {
    rules: [
      { test: /\.(ts|tsx|jsx)$/, loader: 'ts-loader' },
      {
        test: /\.(css|scss)$/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
      { test: /\.(png|jpg|gif|svg|eot|ttf)$/i, loader: 'url-loader' },
    ],
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: path.join(__dirname, frontend_entry),
      cache: false,
    }),
    new webpack.EnvironmentPlugin({
      NODE_ENV: 'development',
      ...canisterEnvVariables,
    }),
    new webpack.ProvidePlugin({
      Buffer: [require.resolve('buffer/'), 'Buffer'],
      process: require.resolve('process/browser'),
    }),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.ProvidePlugin({
      React: 'react',
    }),
    new Dotenv(),
  ],
  // proxy /api to port 8000 during development
  devServer: {
    proxy: {
      '/api': {
        target: 'http://127.0.0.1:8000',
        changeOrigin: true,
        pathRewrite: {
          '^/api': '/api',
        },
      },
    },
    static: path.resolve(__dirname, 'src', frontendDirectory, 'assets'),
    hot: true,
    watchFiles: [path.resolve(__dirname, 'src', frontendDirectory)],
    liveReload: true,
    historyApiFallback: true,
  },
}