| /** |
| * @license |
| * 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. |
| */ |
| |
| module.exports = api => { |
| const ENV = api.env(); |
| const DEV = ENV === 'development'; |
| const TEST = ENV === 'test'; |
| const CJS = ENV === 'cjs'; |
| |
| // Options for the @babel/env preset. |
| const envOptions = { |
| // Transform module syntax if necessary. |
| modules: CJS ? 'commonjs' : false, |
| // Enable transformations for shipped proposals. |
| shippedProposals: true, |
| // Set target environment to default browsers. |
| targets: 'defaults', |
| }; |
| |
| // Options for the module-resolver plugin. |
| // Used for resolving source files during development and testing. |
| let resolverOptions = { |
| alias: { |
| '^@annotator/(.+)$': '@annotator/\\1/src/index.js', |
| }, |
| }; |
| |
| // Options for the @babel/transform-runtime plugin. |
| const runtimeOptions = { |
| // Use core-js version 3. |
| corejs: 3, |
| // Use helpers formatted for the target environment. |
| useESModules: !CJS, |
| }; |
| |
| return { |
| plugins: [ |
| 'preserve-comment-header', |
| ['@babel/transform-runtime', runtimeOptions], |
| ...(DEV || TEST ? [['module-resolver', resolverOptions]] : []), |
| ...(TEST ? ['istanbul'] : []), |
| ], |
| presets: [['@babel/env', envOptions]], |
| }; |
| }; |