code: function fixVarNames(varObj = {}) {
      const reLeadingHyphens = /^-{2}/;
  
      return Object.keys(varObj).reduce((obj, value) => {
          const key = reLeadingHyphens.test(value) ? value : `--${value.replace(/^-+/, '')}`;
  
          obj[key] = varObj[value];
  
          return obj;
      }, {});
  }
docs: Converts all object property names to leading '--' style
  
  @param {object} varObj Object containing CSS custom property name:value pairs
  @returns {object}