code: function augmentMap(bemNode, map) {
      const name = bemNode.block;
  
      if (map[name]) {
          assert(typeof map[name] === 'string', `options.map: new name of ${name} must be string`);
          bemNode.block = map[name];
      }
  
      return bemNode;
  }
docs: Replace block names with new one
  
  @param {Object} bemNode - representation of bem entity
  @param {Object} map - key:blockName, value:newBlockName
  @returns {Object} bemNode