code: function loopResponsiveRules(breakpoints) {
    /**
     * Closure function that handles each @responsive atRule
     * @param {Object} rule
     */
    return (rule) => {
      const subRules = rule.nodes;
      subRules.forEach(responsifyRule(breakpoints));
      /* remove the @responsive structure since we've built the responsive rules we need */
      rule.remove();
    };
  }
docs: Loops through all @responsive atRules in the css to find the rules that need to be responsified.
  @param {Array} breakpoints The processed breakpoints to build the rules off of
  @return {Function}