You heard wrong.

The only way typescript is going away is if JS essentially incorporates it.

The only things people don't like about it is that you need some tooling and a build step.

However, with its popularity, ts is built in to a lot of things, so the tooling usually isn't a big burden (particularly to get started).

And it's viable in a lot of cases these days to forgo the build step and instead use JS with typescript type annotations. (That might be what you heard about. That's really still using typescript, though.)