I was using v5, and it was working, but migration to v6 had some runtime errors. In trying to fix the problem, nothing I found mentioned that you need to move from the 0.* versions of modules to the 6.* versions. My IDE, which makes suggestions, didn’t even offer them as a possibility. For others that may be having the same issue, this is from the package.json that works for our project:
"@codemirror/autocomplete": "^6.4.2",
"@codemirror/commands": "^6.2.2",
"@codemirror/language": "^6.6.0",
"@codemirror/lang-javascript": "^6.1.4",
"@codemirror/lang-html": "^6.4.2",
"@codemirror/lang-xml": "^6.0.2",
"@codemirror/lint": "^6.2.0",
"@codemirror/search": "^6.2.3",
"@codemirror/state": "^6.2.0",
"@codemirror/view": "^6.9.2",