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Difference between untyped module and ambient shorthand module used as superclass #12329

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Description

TypeScript Version: nightly (2.2.0-dev.20161117)

Code

// @Filename: /node_modules/foo/index.js
This file is not read.

// @Filename: /declarations.d.ts
declare module "bar";

// @Filename: /a.ts
import Foo from "foo";
import Bar from "bar";

class A extends Foo { }

class B extends Bar { }

declare var x: any;
class C extends x {}

const y = Foo;
class D extends y {}

Expected behavior:

No errors? All errors?

Actual behavior:

Classes B and C fail with error TS2507: Type 'any' is not a constructor function type.

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