babel.config.js

module.exports = (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)
            }.`,
        );
    }

    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),
    };
};