Multi‑providers

6.8 Multi-providers (multi: true)

multi: true allows multiple providers for the same token.

export const LOGGERS = new InjectionToken<LoggerService[]>("LOGGERS");

providers: [
  { provide: LOGGERS, useClass: LoggerService, multi: true },
  { provide: LOGGERS, useClass: AnotherLoggerService, multi: true },
];

Note: Multi-providers remain unchanged in Angular 21; they work with standalone services and components.