clearInterval not working with handle

Question

I have a problem with clearInterval function. In Typescript it is highlighted red "argument types do not match parameters". So I am unable to log out user. Here is the function:

private check() {
    if (this.isLogged) {
        var timer = setInterval(() => {
            if(this.Expiration < new Date()) {
                this.signOut.emit(true);
                clearInterval(timer);
            }
        }, 3000);
    }
}

Can I do this instead of clearInterval ?

timer = null;

Answer 1

Can I do this instead of clearInterval ?

No. Doing that would have no effect on the interval timer. It just sets the timer variable to null.

In Typescript it is highlighted red "argument types do not match parameters".

Make it match. One would have expected type inference to be correctly assigning timer the type number, but the error you've quoted suggests that's not happening. You can do it explicitly:

var timer : number = setInterval(() => {
// -------^^^^^^^^