Enhance webpack transform async plugin to use babel runtime (with fix)

[steverep]

Proposed change

Retry of #20543 without my bonehead mistake that caused #20697.

See steverep/transform-async-modules-webpack-plugin#54 for the actual fix, which just adds .default when requiring the helpers. I was testing back and forth with HA using installs straight from GH and clearly forgot a final update somewhere. 😞

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[steverep]

@piitaya thanks for posting the stack trace. Feel free to double check this on actual hardware if you can, but I could repro on modern browsers just by forcing the legacy build.

@silamon thanks for bisecting the issue.

[piitaya]

Thank you! I will test on Safari 12 🙂

[piitaya]

It works using iPad with iOS 12.