support for typescript as long as you are only using it for type checking, not if you are also using features that are not supported in the javascript version you are targeting.
> not if you are also using features that are not supported in the javascript version you are targeting.
reply
This is only 'half-assed' anyway, TS will only emulate new language features on older JS target version, but not any Javascript runtime features (like new Object methods). For the latter you will still need a separate polyfill solution.
If you need JS syntax features that Node.js doesn't support you can use tsc, babel, etc.
Because obviously unsupported features are unsupported, whether JS or TS.