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InjectFlags

enum

Injection flags for DI.

enum InjectFlags {
  Default: 0b0000
  Host: 0b0001
  Self: 0b0010
  SkipSelf: 0b0100
  Optional: 0b1000
}

Member	Description
`Default: 0b0000`	Check self and check parent injector if needed
`Host: 0b0001`	Specifies that an injector should retrieve a dependency from any injector until reaching the host element of the current component. (Only used with Element Injector)
`Self: 0b0010`	Don't ascend to ancestors of the node requesting injection.
`SkipSelf: 0b0100`	Skip the node that is requesting injection.
`Optional: 0b1000`	Inject `defaultValue` instead if token not found.

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https://v12.angular.io/api/core/InjectFlags