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Module Namespace Exotic Objects are incorrectly typed as if they have an Object prototype
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<!-- Please try to reproduce the issue with `typescript@next`. It may have already been fixed. -->
**TypeScript Version:** 3.5.3
<!-- Search terms you tried before logging this (so others can find this issue more easily) -->
**Search Terms:**
- import hasOwnProperty
- import star hasOwnProperty
- namespace exotic object
- import prototype
**Code**
```ts
import * as Foo from "./Foo"
if (foo.hasOwnProperty("bar")) {
console.log(foo.bar)
}
```
**Expected behavior:**
Type error due to `hasOwnProperty` not existing, as the ["module namespace exotic object" should have a `null` prototype](https://tc39.es/ecma262/#table-29).
**Actual behavior:**
Code runs producing runtime error that `hasOwnProperty` is `undefined`.
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