Providers

Provider defines how a token is registered in a module container.

Supported Forms

1. Constructor provider (MyService)
2. useClass
3. useValue
4. useFactory
5. useExisting

Scope

Supported values:

• singleton (default)
• transient
• containerScoped
• resolutionScoped (not supported for useFactory)

scope also accepts raw Scope.* aliases from tsyringe.

Registration Examples

const providers: Provider[] = [
    LoggerService,
    { provide: API_URL, useValue: "https://api.example.com" },
    { provide: HttpClient, useClass: HttpClient, scope: "singleton" },
    {
        provide: FeatureClient,
        useFactory: (apiUrl: string, logger?: LoggerService) => new FeatureClient(apiUrl, logger),
        inject: [API_URL, { token: LoggerService, optional: true }],
        scope: "containerScoped",
    },
    { provide: AliasToken, useExisting: LoggerService },
]

Factory Dependencies

For useFactory, dependencies are resolved from inject in order:

• InjectionToken -> required dependency
• { token, optional: true } -> returns undefined if token is absent

The current container object is intentionally not passed into factory arguments.