Component Call not recognizing boolean. User error?

So I have a JS making a call to a CS script using GetComponent.
JS:

 var upbutton = false;
 
 function Update () 
 {
     upbutton = GetComponent(UpButton);
     upbutton.WasUpPressed();

Then there's the CS
CS:

 public class UpButton : MonoBehaviour 
 {
     bool upPressed = false;
             
     void OnMouseDown()
     {
         upPressed = true;
     }
             
     bool WasUpPressed()
     {
         return upPressed;
     }
 }

Problem is that I get an error back saying:
" 'WasUpPressed' is not a member of 'boolean' "