Validate the entire tree of options passed to preset.

Maybe, each plugin can export a list of options that only babili preset understands and we can validate them only when using the preset and not when using the plugin separately.

module.exports = function plugin() {};
module.exports.options = PropTypes.object({
  n: PropTypes.number
});

Or, this can be implemented in bab

Which will behave like that

let settings = await prettyConfig('rollup', { configFiles })

if (!settings) {
  settings = await prettyConfig('rolldown', { configFiles })
}
console.log(settings)

instead of above we can hide it to look like that

const settings = await prettyConfig(['rollup', 'rolldown'], { configFiles })

if (!settings) {
  console.log('no config file

Is your feature request related to a problem? Please describe.

I'd love to have @babel/plugin-syntax-top-level-await to be used

https://babeljs.io/blog/2019/11/05/7.7.0

parser.parse(inputCode, {
  plugins: ["topLevelAwait"]
});