Optional injector reference if created outside injector context and MutationObserver options. If no MutationObserver options are passed then only all attributes are observed.
Optional
A debug name for the signal. Used in Angular DevTools to identify the signal.
This signal must either be created in an injection context or passed an injector.
Optional injector reference if created outside injector context and MutationObserver options. If no MutationObserver options are passed then only all attributes are observed.