babel.config.js

module.exports = function (api) {
    var validEnv = ['development', 'test', 'production'];
    var currentEnv = api.env();
    var isDevelopmentEnv = api.env('development');
    var isProductionEnv = api.env('production');
    var 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) +
            '.'
        )
    }

    return {
        presets: [
            isTestEnv && [
                '@babel/preset-env',
                {
                    targets: {
                        node: 'current'
                    }
                }
            ],
            (isProductionEnv || isDevelopmentEnv) && [
                '@babel/preset-env',
                {
                    forceAllTransforms: true,
                    useBuiltIns: 'entry',
                    corejs: 3,
                    modules: false,
                    exclude: ['transform-typeof-symbol']
                }
            ]
        ].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-runtime',
                {
                    helpers: false,
                    regenerator: true,
                    corejs: false
                }
            ],
            [
                '@babel/plugin-transform-regenerator',
                {
                    async: false
                }
            ]
        ].filter(Boolean)
    }
};