Add TypeScript definition

[BendingBender]

No description provided.

[sindresorhus]

Why the extra empty line here?

[BendingBender]

VS Code only renders the following example as code if I add this extra empty line.

An alternative (which I dislike) would be to write it like this:

	 * - `bracket`: stands for parsing correctly arrays with bracket representation on the query string, such as:
	 * 
	 * ```js
  queryString.parse('foo[]=1&foo[]=2&foo[]=3', {arrayFormat: 'bracket'});
  //=> foo: [1,2,3]
```
	 *

[sindresorhus]

Ah ok. I had a feeling it was something like that.

[Cellule]

A little late now, but would have been nice for the definition file to match closer to the version in DefinitelyTyped
https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/query-string/index.d.ts
Specifically InputParams vs {[key: string]: unknown} and OutputParams vs ParsedQuery
ParsedUrl is a welcome addition though

[BendingBender]

This is a necessary evil. This one time we have to break compat with DT.

The benefit is that now types will always be up to date and if a breaking change is introduced to the types, a major version will be released.

In DT, breaking changes to types may be introduced even to patch releases.