babel.config.js

/**
 * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

 const semver = require('semver');
 const pkg = require('./package.json');

 const supportedNodeVersion = semver.minVersion(pkg.engines.node).version;

 module.exports = {
   babelrcRoots: ['examples/*'],
   // we don't wanna run the transforms in this file over react native
   exclude: /react-native/,
   overrides: [
     {
       plugins: [
         'babel-plugin-replace-ts-export-assignment',
         require.resolve(
           './scripts/babel-plugin-jest-replace-ts-require-assignment.js',
         ),
       ],
       presets: [
         [
           '@babel/preset-typescript',
           {
             // will be the default in Babel 8, so let's just turn it on now
             allowDeclareFields: true,
             // will be default in the future, but we don't want to use it
             allowNamespaces: false,
           },
         ],
       ],
       test: /\.tsx?$/,
     },
   ],
   plugins: [
     ['@babel/plugin-transform-modules-commonjs', {allowTopLevelThis: true}],
     '@babel/plugin-proposal-class-properties',
     require.resolve('./scripts/babel-plugin-jest-require-outside-vm'),
   ],
   presets: [
     [
       '@babel/preset-env',
       {
         bugfixes: true,
         // a runtime error is preferable, and we need a real `import`
         exclude: ['@babel/plugin-proposal-dynamic-import'],
         shippedProposals: true,
         targets: {node: supportedNodeVersion},
       },
     ],
   ],
 };