Fix use of let in mode
Fix use of let in mode

dperetti/CodeMirror,mtaran-google/CodeMirror,mtaran-google/CodeMirror,SidPresse/CodeMirror,notepadqq/CodeMirror,thomasjm/CodeMirror,namin/CodeMirror,hackmdio/CodeMirror,thomasjm/CodeMirror,namin/CodeMirror,codio/CodeMirror,pabloferz/CodeMirror,hackmdio/CodeMirror,hackmdio/CodeMirror,nightwing/CodeMirror,nightwing/CodeMirror,nightwing/CodeMirror,notepadqq/CodeMirror,wingify/CodeMirror,codio/CodeMirror,codio/CodeMirror,wingify/CodeMirror,thomasjm/CodeMirror,pabloferz/CodeMirror,mtaran-google/CodeMirror,SidPresse/CodeMirror,wingify/CodeMirror,dperetti/CodeMirror,namin/CodeMirror,SidPresse/CodeMirror,dperetti/CodeMirror,pabloferz/CodeMirror,notepadqq/CodeMirror