(webdriverio): support async iterators for WebdriverIO.ElementArray

[christian-bromann]

Proposed changes

fixes #11872

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Further comments

This will break current behavior where someone would do this:

const elems = await $$('selector')
elems.map((el) => el.selector) // type "string[]"

is now:

const elems = await $$('selector')
elems.map((el) => el.selector) // type "Promise<string[]>"

as all async iterators will return a promise. However I doubt anyone would iterate over an WebdriverIO.Element[] to filter or map through its static properties.

Reviewers: @webdriverio/project-committers

[erwinheitzman]

Awesome work, love it 😃