Confusion on modules section

The section [where the global module declaration explained](https://basarat.gitbook.io/typescript/project/modules/external-modules#overturning-dynamic-lookup-just-for-types) there is an example like that:

```
// global.d.ts
declare module 'foo' {
// Some variable declarations
export var bar: number; /*sample*/
}
```

and

```
// anyOtherTsFileInYourProject.ts
import * as foo from 'foo';
// TypeScript assumes (without doing any lookup) that
// foo is {bar:number}
```

I can't achieve to make this work. I'm not quite sure this is a typo or something else or I don't understand the concept very well as a learner. But if I define the module like that, I can make it work:

```
declare module "foo" {
// Some variable declarations
export type bar = number; /*sample*/
}
```

Start with the linked modules documentation section and reproduce both declaration examples in a small TypeScript project. Check whether the `export var bar: number` example behaves as described; done means correcting the example or clarifying the explanation so the documented module declaration is accurate.

Written by the indexing model from the issue text.