code: function interpolateColors(themeColors) {
        var rgbColors = {};
  
        var hasColorProperty = themeColors.hasOwnProperty('color');
  
        angular.forEach(themeColors, function (value, key) {
          var color = extractColorOptions(value);
          var hasBackground = key.indexOf('background') > -1;
  
          rgbColors[key] = parseColor(color);
          if (hasBackground && !hasColorProperty) {
            rgbColors.color = parseColor(color, true);
          }
        });
  
        return rgbColors;
      }
docs: Convert the color expression into an object with scope-interpolated values
  Then calculate the rgba() values based on the theme color parts
  @param {Object} themeColors json object, keys are css properties and values are string of
  the wanted color, for example: `{color: 'red-A200-0.3'}`.
  @return {Object} Hashmap of CSS properties with associated `rgba()` string values