`TS7056` for exported generic arrow function with return type (arrow-only)

[rubenferreira97]

Exporting a generic arrow function that returns a type triggers TS7056: The inferred type of this node exceeds the maximum length the compiler will serialize. An explicit type annotation is needed. This only occurs when the function is exported as an arrow function. An equivalent function declaration does not error. Compiling directly with typescript@6.0 does not reproduce the issue.

Steps to reproduce

Repo link

Behavior with typescript@6.0

No error.

Behavior with tsgo

src/example.ts:5:14 - error TS7056: The inferred type of this node exceeds the maximum length the compiler will serialize. An explicit type annotation is needed.

5 export const SortableQuery = <S extends TEnum>({
               ~~~~~~~~~~~~~


Found 1 error in src/example.ts:5

[rubenferreira97]

I'm not sure exactly which version fixed this, but I can confirm it's resolved when testing on 7.0.0-dev.20260325.1.

[jakebailey]

Would have been #2459, I'm sure.