CodeMirror lang example broken

I’ve followed first “Bundle CodeMirror with Rollup”, where I had a simple editor with javascript language support, that was really great. But when troed the lang-example tutorial, my poor editor stopped working! This is the error I’m getting in my browser console:

editor.bundle.js:2019 Uncaught Error: Unrecognized extension value in extension set ([object Object]). This sometimes happens because multiple instances of @codemirror/state are loaded, breaking instanceof checks.
    at inner (editor.bundle.js:2019:26)
    at inner (editor.bundle.js:1994:20)
    at inner (editor.bundle.js:2020:16)
    at inner (editor.bundle.js:1994:20)
    at inner (editor.bundle.js:2020:16)
    at inner (editor.bundle.js:1994:20)
    at flatten$1 (editor.bundle.js:2023:8)
    at Configuration.resolve (editor.bundle.js:1931:28)
    at EditorState.create (editor.bundle.js:2758:48)
    at editor.bundle.js:39661:32

I’ve uploaded my project to this github repo.

I’ve followed too more posts in this forum, but none of them worked.

I don’t know. You have two copies of @codemirror/state in that bundle, but if I build locally there’s only one, so I can’t really say why or how.