How to write code for libraries that do not have declarations?

Question

typescript

I write in jetbrains PhpStorm and set everything up myself, that is, I do not use tasks and ide compilers.
And so I ran into a situation where, for some reason, the library I needed
could not be compatible with its .d.ts declaration.
And on this question - how to write now? If I can't disable this barrier, will I just be forced to rewrite a multi-thousand library? What should I do, I'm on edge :)

Answer 1

rewrite a multi-thousand library?

https://github.com/borisyankov/DefinitelyTyped - that is, there is nothing here?
You don't need to rewrite anything at all, you can just use JS as TS. Or write your own declaration.