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6419240ab2
* Declaration emit includes function properties
It does this by printing the type as an object literal type:
```ts
function f() { }
f.p = 1
```
Appears in a d.ts as
```ts
declare var f: {
(): void;
p: number;
}
```
It would also be possible to represent it as a namespace merge. I'm not
sure which is better.
```ts
declare function f(): void;
declare namespace f {
export var p: number;
}
```
In order to avoid a private-name-used error (though I think it was
actually *unused*), I also had to change the nodeBuilder code to match.
This is arguably harder to read. So it's possible that I should instead
keep the nodeBuilder version as `typeof f` and make an exception for
private name use.
* Emit namespace merge instead of object type
This makes the change smaller, overall.
* Fix isJSContainerFunctionDeclaration+namespace merges
Also improve emit style to match other namespace emit.
* Add isPrivate + test case from PR comments