webpack.config.js

const InlineChunkHtmlPlugin = require('react-dev-utils/InlineChunkHtmlPlugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const TsconfigPathsPlugin = require('tsconfig-paths-webpack-plugin')
const path = require('path')
const webpack = require('webpack')

module.exports = (env, argv) => ({
  mode: argv.mode === 'production' ? 'production' : 'development',

  // This is necessary because Figma's 'eval' works differently than normal eval
  devtool: argv.mode === 'production' ? false : 'inline-source-map',

  entry: {
    ui: './src/ui/ui.tsx', // The entry point for your UI code
    plugin: './src/index.ts' // The entry point for your plugin code
  },

  module: {
    rules: [
      // Converts TypeScript code to JavaScript
      {
        test: /\.tsx?$/,
        use: 'ts-loader',
        exclude: /node_modules/
      },

      // Enables including CSS by doing "import './file.css'" in your TypeScript code
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader']
      },

      // Allows you to use "<%= require('./file.svg') %>" in your HTML code to get a data URI
      {
        test: /\.(png|jpg|gif|webp|svg|zip)$/,
        use: 'url-loader'
      }
    ]
  },

  // Webpack tries these extensions for you if you omit the extension like "import './file'"
  resolve: {
    extensions: ['.tsx', '.ts', '.jsx', '.js'],
    plugins: [new TsconfigPathsPlugin({/* options: see below */})]
  },

  output: {
    filename: '[name].js',
    path: path.resolve(__dirname, 'dist') // Compile into a folder called "dist"
  },

  // Tells Webpack to generate "ui.html" and to inline "ui.ts" into it
  plugins: [
    new webpack.DefinePlugin({
      global: {} // Fix missing symbol error when running in developer VM
    }),
    new HtmlWebpackPlugin({
      inject: 'body',
      template: './src/ui/ui.html',
      filename: 'ui.html',
      chunks: ['ui']
    }),
    new InlineChunkHtmlPlugin(HtmlWebpackPlugin, [/ui/])
  ]
})