v3.1.0

Added

Provider targeting

• Tag type and constants
  • TagValue type for string or symbol tag values
  • TAG_ROOT constant - automatically assigned to injectors without parent that don't explicitly
    specify a tag
  • TAG_SINK constant - sink injectors ignore at property and register all incoming providers
    locally
  • InjectorOptions now has optional tag?: TagValue | null property
  • Injectors automatically tagged as TAG_ROOT when no parent and no tag specified
  • Child injectors have null tag by default unless explicitly tagged
  • getTag(): symbol | null method to retrieve injector's normalized tag
• Provider targeting with at property
  • All provider types (ValueProvider, ClassProvider, FactoryProvider, ExistingProvider) now
    support optional at?: TagValue property
  • Providers with at property will only register on injectors with matching tags in the hierarchy
  • Provider registration delegates up the hierarchy until a matching tag is found
  • Sink injectors (TAG_SINK) ignore at property and register all providers locally
  • Providers without at property register on the current injector (existing behavior)
• CopyOptions now supports tag?: TagValue | null property
  • When not specified, copied injector preserves the original injector's tag
  • When explicitly set (including null), copied injector uses the provided tag value
• ForkOptions interface for configuring child injector creation with injector.fork()
  • defaultAllowOverrides?: boolean - Override setting for child injector (default: current
    instance's setting)
  • tag?: TagValue | null - Tag for child injector (default: null)

Misc:

• Added getParent(): Injector | null method to retrieve injector's parent
• newTestInjector() now defaults to TAG_SINK tag for predictable test isolation behavior