fix: make $ and $$ selectors generic
#6883
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This means, much like TS's in built `querySelector` type, you can now do:
```ts
const listItems = page.$$<HTMLLIElement>('ul li');
```
And/or:
```ts
const h2 = page.$<HTMLHeadingElement>('h2');
```
And the return value will be of type `ElementHandle<T>|null`, where `T`
is the type you provided. By default `T` is an `Element`, so you don't
have to provide this if you don't care as a consumer about the exact
type you get back.
mathiasbynens
approved these changes
Feb 13, 2021
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This means, much like TS's in built
querySelectortype, you can now do:And/or:
And the return value will be of type
ElementHandle<T>|null, whereTis the type you provided. By default
Tis anElement, so you don'thave to provide this if you don't care as a consumer about the exact
type you get back.