strange non error implementing interface

[lucamorelli]

Hi,
honestly I don't know if this is an issue, but I just noticed this using vs 2013 update 3 rtm

I have this interface

export interface ISoluzioniService {       
    ...       
    alberoSoluzione(idSoluzione: number, idPalmare: number);       
}

and a class that implements it this way

export class SoluzioniService implements Interfaces.ISoluzioniService {
    public alberoSoluzione() {
        var workUrl = this.GetBaseUrl();
        workUrl += "ListaSoluzioni";
        var deferred = this.q.defer();
    }
    ...

if I remove the implementation of the alberoSoluzione method int the class an error is given because the interface is not implemented, but if I add, like in this case, an implementation of the method with a different number of parameters no error is given.
Is this normal?

thanks,
luca

[basarat]

Is this normal?

yes. But not the other way around : https://github.com/Microsoft/TypeScript/wiki/Type-Compatibility#comparing-two-functions

interface ISoluzioniService {              
    alberoSoluzione(a:number);       
}

class SoluzioniService implements ISoluzioniService {
    public alberoSoluzione(a:number,b:number) { // ERROR
    }
}

Basically it is safe to call a function that expects fewer parameters with more arguments but not the other way around.

[lucamorelli]

ok, thanks