ttypescript VS ts-morph

Actually this can easily overcome by using https://github.com/cevek/ttypescript that allows using transformers in tsc and define then in tsconfig.json

You could write custom transformer for this (using ttypescript), if you really want to

didn't look to hard at it but afaik ttypescript is what you need https://github.com/cevek/ttypescript

That's it! after this, just register it with the method described on ttypescript.

As I noted above, this is a TypeScript transformer plugin so it needs to hook this plugin on TypeScript compilation phase. I suppose one of the easiest ways is using ttypescript which is a custom TypeScript compiler that can hook the transformer plugin on a compilation. Please refer also to the "How to use this transformer" section in README.

If you don't want to use a bundler, you can use https://github.com/cevek/ttypescript in combination with https://github.com/LeDDGroup/typescript-transform-paths

You can use the plugin https://github.com/awerlogus/io-ts-transformer with https://github.com/cevek/ttypescript to get compile time generation of io-ts codecs as well.

There is also a forked version of the compiler that allows custom transformers: https://github.com/cevek/ttypescript

Closest I can think of is ttypescript

I recently came across an incredibly powerful tool called ts-morph. It's an Abstract Syntax Tree (AST) code analyzer and manipulator that can easily locate class declarations and their references. Just remember, it only works on TypeScript files. To use it, we created a new "build.ts" file and harnessed the full potential of Bun's API. Because ts-morph only understands TypeScript files, we bundled our files accordingly.

I'll definitely look into these two generation suggestions, one I found from a quick google search was [ts-morph](https://github.com/dsherret/ts-morph/tree/latest/packages/ts-morph), but I haven't looked into it further yet.

ts-morph may also help.

The declarations (functions, variables, classes ...) and their docs are extracted with a custom API extractor I built based on the ts-morph library and the TypeScript compiler.

There are a couple of ways. Like you mentioned Babel has various features that count as language extensions and there's also SweetJS. I've been interested in exploring the compiler API personally and ts-morph.