babel.config.js

// Copyright 2021 Google LLC

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//     https://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

module.exports = (api) => {
  api.cache(true)

  return {
    presets: [
      [
        '@babel/env',
        {
          targets: {
            esmodules: true,
          },
          modules: false,
        },
      ],
      [
        '@babel/preset-react',
        {
          development: process.env.BABEL_ENV !== 'build',
        },
      ],
      '@babel/preset-typescript',
    ],
    env: {
      build: {
        ignore: [
          '**/*.d.ts',
          '**/*.test.js',
          '**/*.test.jsx',
          '**/*.test.ts',
          '**/*.test.tsx',
          '__snapshots__',
          '__tests__',
        ],
      },
    },
    ignore: ['node_modules'],
    plugins: [
      '@babel/plugin-proposal-class-properties',
      '@babel/plugin-proposal-object-rest-spread',
      '@babel/plugin-transform-runtime',
    ],
  }
}