Home > @microsoft/api-extractor-model > ApiReleaseTagMixin > isBaseClassOf

ApiReleaseTagMixin.isBaseClassOf() function

A type guard that tests whether the specified ApiItem subclass extends the ApiReleaseTagMixin mixin.

Signature:

function isBaseClassOf(apiItem: ApiItem): apiItem is ApiReleaseTagMixin;

Parameters

Parameter	Type	Description
apiItem	ApiItem

Returns:

apiItem is ApiReleaseTagMixin

Remarks

The JavaScript instanceof operator cannot be used to test for mixin inheritance, because each invocation of the mixin function produces a different subclass. (This could be mitigated by Symbol.hasInstance, however the TypeScript type system cannot invoke a runtime test.)