Javascript mixin symbols are not available for the mixed-in CSS

[idoros]

Actual Behavior

Mixing in CSS from Javascript might define symbols that are in use in other positions in the mixin snippet, however, Stylable does not collect symbols from the snippet in order to provide the mixed in snippet transformation. For example animation-name in mixin cannot resolve @keyframes that are defined in the same mixin (see playground)

Expected Behavior

Symbols defined in a Javascript mixin should be available for the mixed-in transformation in addition to the symbols available from the mixed-to stylesheet.

Version

@stylable/core@4.10.2