How to set polgon fill type to no color in Mapbox

Question

I'm new to Mapbox and I am trying to remove any color in my polygon fill using the Mapbox API. Note: I don't want to set opacity/transparency. I simply want there to be no color. It keeps defaulting to "#000000", even if I comment out the 'fill-color' property. Is there any way to achieve this?

 map.addLayer({
            'id': 'us-states',
            'type': 'fill',
            'source': 'us-states',
            'layout': {},
            'paint': {
                //'fill-color': '#333',
                'fill-opacity': 0.8,
                'fill-outline-color': '#000'
            }
    }) 

Answer 1

I got this to work with:

'paint': {
            'fill-color': 'transparent',
            'fill-opacity': 1.0
        }