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> 58.9% TypeScript and 32.6% JavaScript

Isn't that just 91.5% JavaScript?

TypeScript is not real.

Almost, but not entirely, unlike birds

Maybe ask all the startups looking to scale their TS\JS microservices "stack" using event driven architecture.

this app is io bound and in that case it doesn't matter it runes on ts / js

It appears that the backend is written in TS, while the frontend in JS.

Personally I separate church and state by writing tests in JS and application code in TS.

If you're asking why these languages at all when this and that other language is faster, most likely it's less of a bottleneck than estimated.