babel.config.js

// https://babeljs.io/docs/en/options#babelrcroots
const { extendDefaultPlugins } = require('svgo');

module.exports = {
  babelrcRoots: ['./platform/*', './extensions/*', './modes/*'],
  presets: ['@babel/preset-env', '@babel/preset-react', '@babel/preset-typescript'],
  plugins: [
    ['@babel/plugin-proposal-class-properties', { loose: true }],
    '@babel/plugin-transform-typescript',
    ['@babel/plugin-proposal-private-property-in-object', { loose: true }],
    ['@babel/plugin-proposal-private-methods', { loose: true }],
    '@babel/plugin-transform-class-static-block',
  ],
  env: {
    test: {
      presets: [
        [
          // TODO: https://babeljs.io/blog/2019/03/19/7.4.0#migration-from-core-js-2
          '@babel/preset-env',
          {
            modules: 'commonjs',
            debug: false,
          },
        ],
        '@babel/preset-react',
        '@babel/preset-typescript',
      ],
      plugins: [
        '@babel/plugin-proposal-object-rest-spread',
        '@babel/plugin-syntax-dynamic-import',
        '@babel/plugin-transform-regenerator',
        '@babel/transform-destructuring',
        '@babel/plugin-transform-runtime',
        '@babel/plugin-transform-typescript',
        '@babel/plugin-transform-class-static-block',
      ],
    },
    production: {
      presets: [
        // WebPack handles ES6 --> Target Syntax
        ['@babel/preset-env', { modules: false }],
        '@babel/preset-react',
        '@babel/preset-typescript',
      ],
      ignore: ['**/*.test.jsx', '**/*.test.js', '__snapshots__', '__tests__'],
    },
    development: {
      presets: [
        // WebPack handles ES6 --> Target Syntax
        ['@babel/preset-env', { modules: false }],
        '@babel/preset-react',
        '@babel/preset-typescript',
      ],
      plugins: ['react-hot-loader/babel'],
      ignore: ['**/*.test.jsx', '**/*.test.js', '__snapshots__', '__tests__'],
    },
  },
};