module.exports = function (api) { const validEnv = ['development', 'test', 'production']; const currentEnv = api.env(); const isDevelopmentEnv = api.env('development'); const isProductionEnv = api.env('production'); const isTestEnv = api.env('test'); if (!validEnv.includes(currentEnv)) { throw new Error( 'Please specify a valid `NODE_ENV` or ' + '`BABEL_ENV` environment variables. Valid values are "development", ' + '"test", and "production". Instead, received: ' + JSON.stringify(currentEnv) + '.' ); } const defaultConfigFunc = require('shakapacker/package/babel/preset.js'); const resultConfig = defaultConfigFunc(api); const changesOnDefault = { presets: [ [ '@babel/preset-react', { development: isDevelopmentEnv || isTestEnv, useBuiltIns: true } ] ].filter(Boolean), plugins: [ 'babel-plugin-macros', '@babel/plugin-syntax-dynamic-import', isTestEnv && 'babel-plugin-dynamic-import-node', '@babel/plugin-transform-destructuring', [ '@babel/plugin-proposal-class-properties', { loose: true } ], [ '@babel/plugin-proposal-object-rest-spread', { useBuiltIns: true } ], [ '@babel/plugin-transform-regenerator', { async: false } ], isProductionEnv && ['babel-plugin-transform-react-remove-prop-types', { removeImport: true } ], process.env.WEBPACK_SERVE && [ 'react-refresh/babel', { exclude: 'node_modules/**' } ] ].filter(Boolean) }; resultConfig.presets = [...resultConfig.presets, ...changesOnDefault.presets]; resultConfig.plugins = [...resultConfig.plugins, ...changesOnDefault.plugins]; return resultConfig; };