Can't get `getType<T>()` to work

Hello! Awesome project. Thank you!

I have a question, not sure if I am hitting a setup bug, but I am using tst-reflect through webpack and ttypescipt. I have this snippet:

interface IFoo {}
class Foo implements IFoo {}

const foo = new Foo();
getType<Foo>();
getType<typeof foo>();
getType<IFoo>();

I can see my source is instrumented with reflection data correctly, but these calls are all compiling to empty getType() calls. Am I doing something wrong?

[3p3r]

Thanks so much for the detailed response. I also found https://ts-morph.com/ in the meantime that has worked with tst-reflect and doing in-memory compilation. Using ts-morph is admittedly less confusing than the original compiler API.

[Hookyns]

@3p3r

I played with it a little…

The issue is in transpileModule inside typescript itself. It does not load declarations of modules etc. It only transpile given module. getType<>() calls were not recognized as our getType calls so we ignored them. Recognition is based on declaration.

I did some changes, so every getType<T>() without declaration (typechecker returns error for such function), called exactly with one type argument, will be considered as our. Here is new demo.

Included in tst-reflect-transformer@0.12.5.