babel.config.js

// Copyright (c) 2019 Uber Technologies, Inc.
//
// 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
//
//     http://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.

const TARGETS = {
  chrome: '60',
  edge: '15',
  firefox: '53',
  ios: '10.3',
  safari: '10.1',
  node: '8'
};

const CONFIG = {
  default: {
    presets: [
      [
        '@babel/env',
        {
          targets: TARGETS
        }
      ]
    ],
    plugins: [
      'version-inline',
      '@babel/proposal-class-properties',
      [
        'babel-plugin-inline-import',
        {
          extensions: ['.worker.js']
        }
      ]
    ]
  }
};

CONFIG.es6 = Object.assign({}, CONFIG.default, {
  presets: [
    [
      '@babel/env',
      {
        targets: TARGETS,
        modules: false
      }
    ]
  ]
});

CONFIG.esm = Object.assign({}, CONFIG.default, {
  presets: [
    [
      '@babel/env',
      {
        modules: false
      }
    ]
  ]
});

CONFIG.es5 = Object.assign({}, CONFIG.default, {
  presets: [
    [
      '@babel/env',
      {
        modules: 'commonjs'
      }
    ]
  ]
});

CONFIG.cover = Object.assign({}, CONFIG.default);
CONFIG.cover.plugins = CONFIG.cover.plugins.concat(['istanbul']);

module.exports = function getConfig(api) {
  // eslint-disable-next-line
  var env = api.cache(() => process.env.BABEL_ENV || process.env.NODE_ENV);

  const config = CONFIG[env] || CONFIG.default;
  // Uncomment to debug
  // console.error(env, config.plugins);
  return config;
};

module.exports.config = CONFIG.es6;