Function isQString

isQString(string_: string): string_ is `Q${number}`
Tests if a string is a QString. Can also be used as a type guard.
Parameters
- string_: string
  The string to test.
Returns string_ is `Q${number}`
True if the string is a QString.
Example
```
const id = 'Q123';
   if (!isQString(id)) {
       throw new Error('Not a QString');
   }
   WikibaseItemSnak.fromID('P42', id);
```
- Defined in utils/guards/strings.ts:21