sketchapp plugin script to export document color as css rgba value

color_export.js

var doc = context.document;
var app = NSApplication.sharedApplication();
var appController = app.delegate();

var colors = doc.documentData().assets().primitiveColors();
// Convert MSArray into array
var mspalette = colors.array();

// Convert MSColors into hex strings
var palette = [];
for (var i = 0; i < mspalette.count(); i++) {
  var color = mspalette[i];
  var value = 'rgba(' + Math.round(color.red() * 255) + ',' +
    Math.round(color.green() * 255) + ',' +
    Math.round(color.blue() * 255) + ',' +
    Math.round(color.alpha() * 100)/100 + ');');
    log(value);
};