code: def mapFeatures(self, featureMap):
      if self.DefaultLangSys:
          self.DefaultLangSys.mapFeatures(featureMap)
      for l in self.LangSysRecord:
          if not l or not l.LangSys:
              continue
          l.LangSys.mapFeatures(featureMap)
  
imports: from fontTools import ttLib
  from fontTools.ttLib.tables.DefaultTable import DefaultTable
  from fontTools.ttLib.tables import otTables
  from fontTools.merge.base import add_method, mergeObjects
  from fontTools.merge.util import *
  import logging
label_desc: Use image node_id 19 for calling a global function with example usage: mapFeatures(featureMap) without return types