How to use Q.Promise<string> as string?

Question

I have function returning string Q.Promise

module test {

    export function promiseString (): Q.Promise<string> {
        var deferred = Q.defer<string>();
        deferred.resolve('someMessage');
        return deferred.promise;
    }

}

How I can to use return value as string?

Option #1:

Q.fcall(promiseString).then(function (message: string) {
    //  compilation error about incompatible parameters     
});

Option #2:

Q.fcall(promiseString).then(function (promise: Q.Promise<string>) {
    console.log(typeof promise);    //  output string
    //  but i can't use promise as string further
});

Answer 1

If the function always returns a promise (deferred or otherwise), then you don't have to call it with Q.fcall. Simply call:

promiseString().then(...)