Issue with genType Importing Modules in ReScript v11.1 with ReScript Core

[PritishBudhiraja]

I'm using ReScript v11.1 and ReScript Core in my project, and I'm having trouble with genType. Specifically, I have a type that looks like this:

@genType
type hyperInstance = {
  ...,
  confirmOneClickPayment: (JSON.t, bool) => Promise.t<JSON.t>,
}

The compiler generates a file Types.gen.tsx for me, but I'm encountering the following issue:

import type {t as JSON_t} from './JSON.gen.tsx';

import type {t as Promise_t} from './Promise.gen.tsx';

I'm facing this issue in the rescript -

Cannot find module './JSON.gen.tsx' or its corresponding type declarations.ts(2307) Cannot find module './Promise.gen.tsx' or its corresponding type declarations.ts(2307)

I've followed the setup guide from the ReScript documentation here but can't seem to resolve this issue.

Steps I've Taken:

• Ensured my gentypeconfig is correctly set up.
• Checked paths and shim configurations.
• Tried manual shimming but still facing issues.

My Environment:

• ReScript v11.1
• ReScript Core
• TypeScript

Is there something I'm missing, or is this potentially a bug? Any help or guidance would be greatly appreciated.

• [x] Is it a bug? Usage questions should often be asked in the forum instead.
• [x] Concise, focused, friendly issue title & description.
• [x] A minimal, reproducible example.
• [x] OS and browser versions, if relevant.
• [ ] Is it already fixed in master? Instructions

[cometkim]

@cknitt @fhammerschmidt We need to restore the genType shims documentation for v11 users.

[fhammerschmidt]

@cometkim Here you go: https://github.com/rescript-association/rescript-lang.org/pull/906 (Can't add you as a reviewer over there unfortunately)

[fhammerschmidt]

@PritishBudhiraja does this guide help? https://rescript-lang.org/docs/manual/latest/typescript-integration#shims

[PritishBudhiraja]

Hey @fhammerschmidt @cometkim ,

So we tried using shims. It worked for Js library and made it compiled too.

But still I have few issues.

We have updated our repo to v11 and using rescript-core everywhere. So we tried to make this work in the same way but it didn't. Can you please guide us where it's going wrong? or shim folder structure for the same. It's getting a bit confusing.

The versions are mentioned in the above description.

Thanks!

[PritishBudhiraja]

Hey @cometkim @fhammerschmidt any update on the above issue. Like how can we resolve it?

[cometkim]

This is assigned to the v12 release. It is not a simple task as it requires a complete reimplementation of genType. I think I can start implementing it next month.

Until then, you should continue to use Shims. I'll provide a shimming example for Core and others soon.