Ok I'm guessing I'm missing something really simple on this one.

Lets say I have multiple methods that repeat a lot of the same things like this:

    public getDepartments(id: number): ng.IPromise<IDepartmentViewModel[]> {

        this.common.loadStart();

        return this.unitOfWork.teamRepository.getDepartmentsForTeam(id).then((response: IDepartmentViewModel[]) => {

            this.common.loadComplete();

            return response;

        }).catch((error) => {

                this.common.loadReset();

                return error;

            });

    }

Tons of boilerplate for a single call to this.unitOfWork.teamRepository.getDepartmentsForTeam(id)

so I wanted to make a generic wrapper for the boilerplate such as:

private internalCall<T>(method: () => ng.IPromise<T>): ng.IPromise<T> {

        this.common.loadStart();

        return method().then((response: T) => {

            this.common.loadComplete();

            return response;

        }).catch((error) => {

            this.common.loadReset();

            return error;

        });

    }

Which I could then call like:

public getDepartments(id: number): ng.IPromise<IDepartmentViewModel[]> {

        return this.internalCall<IDepartmentViewModel[]>(this.unitOfWork.teamRepository.getDepartmentsForTeam(id));

But I get the following error:

Supplied parameters do not match any signature of call target:

Type '() => ng.IPromise<IDepartmentViewModel[]>' requires a call signature, but type 'ng.IPromise<IDepartmentViewModel[]>' lacks one.

What is the right way to pass my method into the other to call it with supplied parameters?