Node-RED ensure math not below 1

Third party integrations Node-RED
1

Hey Guys,
Could use some assistance.

I have a function in node-red that is dimming some lights.
We are taking the current brightness and reducing it by 25% of the total brightness on each function run. This would great as expected.

However, if the returned value is less then 1 it turns the lights off which we would like to prevent.

I am wondering if someone can help me out with a statement that
IF value is < 1 then the value = 1 (This would get the brightness to = 1 vs turning it off)

newmsg = {};
    brightness = msg.data.attributes.brightness - 64
newmsg.payload = { data: {"brightness":brightness} };
return newmsg;
2 
newmsg = {};
var brightness = msg.data.attributes.brightness - 64;
if(brightness < 1){
    brightness = 1;
}
newmsg.payload = { data: {"brightness":brightness} };
return newmsg;