Native apps written in TypeScript and CSS

Not apparent at first, but this is a TypeScript to c++ compiler at the core (https://github.com/geastack/compiler), with bindings for various platforms.

What do they use for graphics and audio?

Ah this is for embedded apps. Pretty neat!

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"The earlier implementation could not be driven to zero of them, because boxing was load-bearing in its emitter"

In the docs of the repo of their TS to C++ compiler. https://github.com/geastack/compiler