injectOptional()

function injectOptional\<T\>(token: InjectionToken\<T\>): T | undefined;

Defined in: src/lib/di/index.ts:164

Try to inject a service, returning undefined if not found.

Useful for optional dependencies that may not be available.

Type Parameters

Type Parameter
T

Parameters

Parameter	Type	Description
token	InjectionToken<T>	The service class or injection token to inject.

Returns

T | undefined

The service instance, or undefined if not found.

Example

import { injectOptional } from "@core/di";
import { DebugService } from "@modules/dev/debug/debug.service";
 
class MyService {
    // DebugService might not be loaded in production
    private debugService = injectOptional(DebugService);
 
    log(message: string) {
        this.debugService?.log(message);
    }
}