TS4082 occurs when using `composite: true`

Bug Report

🔎 Search Terms

TS4082, composite

🕗 Version & Regression Information

• I was unable to test this on prior versions because composite is a new feature added to typescript (not actually)

⏯ Playground Link

Playground link with relevant code

💻 Code

// This throws
export default (
	a = () => {
		interface Props {}
		return {} as Props
	},
) => {};

// This works
let a = () => {
	interface Props {}
	return {} as Props
}

🙁 Actual behavior

When composite is enabled, the export default statement throws TS4082. And disabling composite fixes this issue.

🙂 Expected behavior

They should both throw, or both not throw :(

This issue only occurs when using an interface. Using a type alias won't cause this issue.

Comienza ejecutando la reproducción enlazada de TypeScript Playground con composite habilitado y, después, compara los callbacks exportados y locales, así como los casos de interface y type-alias. Rastrea la ruta del compilador que informa de TS4082 y añade una prueba de regresión; se considerará terminado cuando las dos formas equivalentes de callback tengan un comportamiento coherente sin introducir regresiones en el caso existente de type-alias.