Edited Unassigned: Typeing \ at the end of the file while in require completion causes an exception [1158]

repro steps:

1- Start typing require at the end of the file until the modules completion list appears.
2- type ' then start typing a module name of the list.
3- before you finish the name type \
4- the following exception happens.

An exception of type 'System.ArgumentOutOfRangeException' occurred in Microsoft.VisualStudio.Text.Data.dll but was not handled in user code

NodejsClassifer.cs : line 574