What a waste of power... $424.000 of API priced tokens amounts to how many kWh burned? And how would you trust this to build your code? Motivations says it all:

Motivations

    Test model capabilities
    Make a fast TypeScript type checker
    Make a ts checker that can work in WASM with high performance
    Memes

He uses it for his real code bases to speed up their compilation and opensourced it so the application might be wider than motivation.

> And how would you trust this to build your code?

In the same way you trust any build of the official compiler: it passes all of the existing tests.