No error about missed "declare" modifier for a top level class inside d.ts

[bashor]

TypeScript Version: 2.7.2

Search Terms: missed declare modifier for a top level class inside d.ts

Code

de.d.ts

export class Foo {
}

test.ts

import { Foo } from "./de";
new Foo()

Expected behavior:
Compiler error, like:
error TS1046: A 'declare' modifier is required for a top level declaration in a .d.ts file.

Actual behavior
Code is compiled successfully

Related Issues:
#1940

[ghost]

Since it's in a module in a .d.ts file, declare is optional.

[bashor]

@Andy-MS where can I read exact rules?

[ghost]

We don't currently have an up-to-date spec, but any information would be here: http://www.typescriptlang.org/docs/handbook/declaration-files/introduction.html

[bashor]

@Andy-MS, thank you!

Honestly, I didn't find rules about when declare is required and when it's optional. But I've seen that all/most examples omit it when use export modifier.

[bashor]

@Andy-MS so, should I or you close the issue?