Typescript is not just 'typing' for JS, it encourages much cleaner abstraction, modularization etc. than JS.
My first Typescript exposure was a re-write of several thousand lines of JS code. After a little bit of 'adding typing' I realized there were much better ways to organize information. The result was powerful - what was once a near hairball of code, was now magnificently cleaner, easier to read, easier to re-factor, easier to maintain.
That experience not only validates the existence of TS but strongly highlights the limitations of JS which has always been a deeply problematic language, full of pot holes and weirdness, and though it's fully understandable why the language evolved how it did - that's no justification for it's ugly failings which cause existential inefficiency in many situations.
Though 'adding typing to JS' might be a good start for using Typescript in any given scenario - anyone only doing that is missing a bigger opportunity.