I would also recommend Typescript. Anything important you need to know about Javascript, you will end up picking up along the way.

My main complaint: the default compiler settings are pretty loose, presumably in the interests of erring on the side of letting Javascript code through by default. I'd recommend going through the available project settings carefully and switching on more of the checks. eslint is also a good idea I think - and a similar comment applies. (I activated pretty much everything, and dialled it back as I found myself getting annoyed by things that felt like poor value for moneey.)