A list of tokens which need to be resolved by the injector. The list of values is then
used as arguments to the useFactory function.
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).
A function to invoke to create a value for this token. The function is invoked with
resolved values of tokens in the deps field.
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Configures the Injector to return a value by invoking a
useFactoryfunction.function serviceFactory() { ... } const provider: FactoryProvider = {provide: 'someToken', useFactory: serviceFactory, deps: []};For more details, see the {@linkDocs guide/dependency-injection "Dependency Injection Guide"}.
Example
{@example core/di/ts/provider_spec.ts region='FactoryProvider'}
Dependencies can also be marked as optional: {@example core/di/ts/provider_spec.ts region='FactoryProviderOptionalDeps'}