It's terrible. The amazing issues that TS can introduce to a codebase are terrifying, and TS has breaking releases on a regular cadence. As someone who has to do maintenance on a legacy TS platform it was miserable and literally involved flipping through TS versions to find one that worked.
My issues are not with strongly typed languages, they're specifically with TS.
What issues does TS introduce into a codebase that weren't already there? This sounds kinda like arguing that if we write fewer tests we'll have fewer bugs.
In our case: 1) slow and long transpilation times, 2) although not that common these days but missing typings used to cause some head scratch 3) overly permissive/overly restrictive type definitions 4) wrongly configured sourcemaps 5) unreadable type definitions/declarations... The list is long but these are off the top of my head
Getting a configuration together that consumes all your dependencies and generates code without crapping a ton of meaningless warnings about duplicate type definitions in its own type mappings for runtime types is non-trivial and requires setting more than a few non-default compiler options, none of which are named anything that means anything.
I still don't know how it's possible to safely, cleanly make a library that other projects can consume comfortably with just TypeScript.
My issues are not with strongly typed languages, they're specifically with TS.