Default values of generic type parameters not applied properly

[tmarsik42]

I noticed some generic types are not referenced properly in svelte files, if they have default value.

I'll include some code snippets to better illustrate what I'm talking about.

Examples are taken from urql. From operationStore.d.ts

export interface OperationStore<Data = any, Vars = any, Result = Data>

AFAIU, if not specified, third generic (Result) is supposed to be the same type as the first one (Data).

something.svelte

As you can see in screenshot, if I specify two generics in svelte file, I get unreferenced third generic Data that is the culprit of unresolved variable errors I get in Webstorm.

Now if I do the same in standalone ts file something.ts I get correct types.

At first I thought it's a problem with tsconfig or something, but in VSCode, I get the same result in svelte file as in Webstorm in typescript file.

edit: It's also interesting that inferred typing in svelte files works correctly

[tmarsik42]

This was resolved for me in Webstorm 2022.1.2 with typescript improvements https://blog.jetbrains.com/webstorm/2022/06/webstorm-2022-1-2/

[tomblachut]

@tmarsik42 That's great to hear, thanks for confirming,