app2.js

let isDrawing  = false;

function draw (e) {
  if(!isDrawing) return ;
  console.log(e);
}

canvas.addEventListener('mousemove', draw);
canvas.addEventListener('mousedown', () => isDrawing = true);
});
canvas.addEventListener('mouseup', ()=> isDrawing = false);
canvas.addEventListener('mouseout', () => isDrawing = false);