DI into Pipeline behavior - Mediatr-ts + Inversify

[turkysha]

Hi,
I want to DI something into my pipeline behavior but I am not able to since pipeline behavior constructor takes "...args: unknown[]" as arguments.

this is what I want to do:

@pipelineBehavior()
class ValidationBehaviour implements PipelineBehavior {
    private validationController: ValidationController;

    constructor(@inject(ValidationController) validationController: ValidationController) {
        this.validationController = validationController;
    }
    
    async handle(request: RequestData<unknown>, next: () => unknown): Promise<unknown> {    
        this.validationController.validate(request);
        return await next();
    }

}
export { ValidationBehaviour }

This is the error I get if I try to setOrder of pipeline behaviors in mediator:

Type 'typeof ValidationBehaviour' is not assignable to type 'PipelineBehaviorClass'.
  Types of construct signatures are incompatible.
    Type 'new (validationController: ValidationController) => ValidationBehaviour' is not assignable to type 'new (...args: unknown[]) => PipelineBehavior'.
      Types of parameters 'validationController' and 'args' are incompatible.
        Type 'unknown' is not assignable to type 'ValidationController'.ts(2322)

I belive this is very possible in c# Mediatr implementation.

[m4ss1m0g]

The constructor of pipelineBehaviour accept only ...args: unknown[], you cannot inject into the constructor.

Try with Property Injection

[turkysha]

@m4ss1m0g it would be great if we could do this. In my opinion it's must have feature because you will definitely need to inject something into pipeline behavior (validation, logger, some other controller, etc.).