Deprecate the ability to define static observedAttributes as a map of attribute names to attribute handlers for non-decorator users, and instead create a new static observedAttributeHandlers for that purpose.
#27
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This keeps the type of
static observedAttributesclean and aligned with the DOM spec, while the newstatic observedAttributeHandlershas the type definition for the library-specific feature. Plus this prevents type issues downstream because the@elementdecorator (callable as a function when not using decorators) coerces the object format into the standard array format, yet the object type will still sppear in subclasses despite that it is never an object in subclasses.deprecation:
static observedAttributes = {}is deprecated, and only the standardstatic observedAttributes = []should be used. The object format will be removed in a breaking version bump.infra: Unrestrict the
typescriptversion so we can keep it updated with other packages in the lume repo.