Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already report this problem, without success.

Stencil Version

4.33

Current Behavior

@AttachInternals() internals!: ElementInternals;

cannot be used without
formAssociated: true in the metadata.

because of a condition in the compiler

Expected Behavior

@AttachInternals() internals!: ElementInternals;

should work without formAssociated: true in the metadata.

CustomStateSet can now be used without formAssociated for components that are not formAssociated.

Future improvement: Add stencil support for custom state / :state().

System Info

Steps to Reproduce

add

@AttachInternals() internals!: ElementInternals;

to a component, an console error will be shown

Code Reproduction URL

Additional Information

Will commit a fix for it, the solution is quite easy:
https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/attachInternals