Can't access property of interface to reference type in another interface

[donaldpipowitch]

TypeScript Version: 1.8.0 (Playground) / 2.1.0-dev

Code

interface Foo {
  bar: string;
}

interface Box<T> {
  container: T;
}

interface FooWithBoxedProps {
  bar: Box<Foo.bar>;
}

Expected behavior:

Behave exactly like this:

interface Foo {
  bar: string;
}

interface Box<T> {
  container: T;
}

interface FooWithBoxedProps {
  bar: Box<string>;
}

Actual behavior:

Cannot find namespace 'Foo'.

[OlegDokuka]

It is unreachable because Foo is not a name space, and variable bar is a part of instance of type Foo. In typescripts philosophy interface is virtual construction and you cant deal with it in any form except extending and inheritance (in other words it is compiler feature).
So, you cant deal with Foo as with namespace.

Also, you can try something like above to solve your problem

interface Foo {
  bar: string;
}

namespace Foo {
 export type bar= string;
}

interface Box<T> {
  container: T;
}

interface FooWithBoxedProps {
  bar: Box<Foo.bar>;
}

[mhegazy]

duplicate of #4640

[donaldpipowitch]

Which is closed in favor of #6606. I'll post my use case there. Thanks so far.