@codemirror/rangeset 
[ WEBSITE | DOCS | ISSUES | FORUM | CHANGELOG ]
This package implements the range set data structure for the CodeMirror code editor.
The project page has more information, a number of examples and the documentation.
This code is released under an MIT license.
We aim to be an inclusive, welcoming community. To make that explicit, we have a code of conduct that applies to communication around the project.