If true, then 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.
{@example core/di/ts/provider_spec.ts region='MultiProviderAspect'}
An injection token. (Typically an instance of Type or InjectionToken, but can be any).
Existing token to return. (equivalent to injector.get(useExisting))
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Configures the Injector to return a value of another
useExistingtoken.const provider: ExistingProvider = {provide: 'someToken', useExisting: 'someOtherToken'};For more details, see the {@linkDocs guide/dependency-injection "Dependency Injection Guide"}.
Example
{@example core/di/ts/provider_spec.ts region='ExistingProvider'}