| /** |
| * @license |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 || TEST ? 'commonjs' : false, |
| // Set target environment to default browsers. |
| targets: 'defaults', |
| }; |
| |
| // Options for the module-resolver plugin. |
| // Used for resolving source files during development. |
| let resolverOptions = { |
| alias: { |
| '^@annotator/(.+)$': '@annotator/\\1/src/index.ts', |
| }, |
| }; |
| |
| // 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 && !TEST, |
| }; |
| |
| return { |
| plugins: [ |
| 'preserve-comment-header', |
| ['@babel/transform-runtime', runtimeOptions], |
| ...(DEV ? [['module-resolver', resolverOptions]] : []), |
| ...(TEST ? ['istanbul'] : []), |
| ], |
| presets: [ |
| ['@babel/env', envOptions], |
| '@babel/preset-typescript', |
| ], |
| }; |
| }; |