I made a TS mixin transformer with full generics support, native syntax and zero runtime overhead

[tonyboho]

Introducing ts-mixin-class.

It's an AST→AST macro transformer that runs before type-checking — so it can rewrite the AST, add or remove symbols from the program, and shape the type-checking that follows.

Written with AI, of course; doing it by hand doesn't seem realistic.

Test coverage is already solid, though the transformer hasn't been battle-tested on a large real-world project yet. Give it a try — feedback very welcome.

P.S. If you're thinking of writing your own macro transformer, AGENTS.md collects a number of hard-won insights about the TS compiler's expectations and the invariants you have to preserve.