adding additional parent selector to all your css rules

addParentSelectorForCSSRules.js

/**
* @method addParentSelectorForRules - adding additional class to all your css selectors
* @returns {String}
*
*
*
Example:
Before processing
"header {background-color: red}"
After:
".your-class-name header {background-color: red}"
*
*
*/
function addParentSelectorForCSSRules(css, selector) {
  return css.replace(/([^\r\n,{}]+)(,(?=[^}]*{)|\s*{)/gm, (match) => {
      return `${selector} ${match}`;
  });
}