[request] getCustomTransformer(program: ts.Program) just like as ts-loader's

[gfx]

In order to use a transformer that uses ts.Program / ts.TypeChecker, for example https://github.com/kimamula/ts-transformer-keys

See https://github.com/TypeStrong/ts-loader#getcustomtransformers--program-program---before-transformerfactory-after-transformerfactory-- for details.

It might be somewhat difficult because TypeScript compiler restricts the use of TypeChecker in transformers: microsoft/TypeScript#25147 , though.

[blakeembrey]

@gfx You're welcome to submit a PR since I'm not 100% sure what you require here. I assume it won't work for ts.transpileModule though?

[gfx]

@blakeembrey

Thanks.

ts.transpileModule() does not provide ts.Program nor ts.TypeChecker instance, which is inevitable for compile-type type information.

BTW I've found https://github.com/cevek/ttypescript , a custom typescript compiler to provide ts.Program to transformers. It is also available as ts-node --typescript ttypescript and it works well for me.

I think the best way is that the official typescript compiler supports such transformers, and I have no idea what is the better 🤔

[saitonakamura]

I have a similar problem, I have a transformer that will generate runtime json validation based on generic type argument so I need an access to typeChecker in there.
https://github.com/ts-type-makeup/superstruct-ts-transformer
The way it's done with ts-loader, they create a program manually
https://github.com/TypeStrong/ts-loader/blob/35b1b5634eececa914f977c31ae182ed88f24987/src/instances.ts#L210

[saitonakamura]

@gfx nice find with ttsc! It would still be better the less hoops you need to jump, methinks