ag-grid-react/babel.config.js

module.exports = {
    presets: [
        '@babel/preset-env',
        '@babel/preset-typescript',
        '@babel/preset-react',
    ],
    plugins: ['@babel/plugin-proposal-class-properties'],
    env: {
        // place plugins for Cypress tests into "test" environment
        // so that production bundle is not instrumented
        test: {
            plugins: [
                // during Cypress tests we want to instrument source code
                // to get code coverage from tests
                'babel-plugin-istanbul',
                '@babel/plugin-proposal-throw-expressions',
                // we also want to export ES6 modules as objects
                // to allow mocking named imports
                [
                    '@babel/plugin-transform-modules-commonjs',
                    {
                        loose: true,
                    },
                ],
            ],
        },
    },
}