.babelrc.js

/**
 * General configuration.
 */
module.exports = {
  presets: [
    '@babel/preset-typescript',
    ['@babel/preset-env', { modules: false }],
    ['@babel/preset-react', { runtime: 'automatic' }]
  ],
  plugins: [
    '@babel/plugin-proposal-object-rest-spread',
    '@babel/plugin-proposal-class-properties'
  ],
  env: {
    cjs: {
      presets: ['@babel/preset-env', '@babel/preset-react']
    },
    test: {
      presets: ['@babel/preset-env', '@babel/preset-react']
    }
  }
};