// shader is a CartoCSS object

var cartocss = [
    '#layer {',
    ' marker-width: [property]',
    ' marker-fill: red',
    '}'
].join('')
var shader = new carto.RendererJS().render(cartocss);
var layers = shader.getLayers()
for (var i = 0; i < layers.length; ++i) {
    var layer = layers[i];
    console.log("layer name: ", layer.fullName())
    console.log("- frames: ", layer.frames())
    console.log("- attachment: ", layer.attachment())

    var layerShader = layer.getStyle({ property: 1 }, { zoom: 10 })
    console.log(layerShader['marker-width']) // 1
    console.log(layerShader['marker-fill']) // #FF0000
}