@angular/core

ExistingProvider

interface

Configures the Injector to return a value of another useExisting token.

interface ExistingProvider {
}

Multi-value example

provide

any

An injection token. Typically an instance of Type or InjectionToken, but can be any.

multi

boolean

When true, injector returns an array of instances. This is useful to allow multiple providers spread across many files to provide configuration information to a common token.

useExisting

any

Existing token to return. (Equivalent to injector.get(useExisting))