According CodeMirror 5 User Manual we can use
lib files codemirror.js and codemirror.css
However, neither in the Github repo, nor in the latest release zip, I can find a .js file in the lib folder.
Please see codemirror5/lib at master · codemirror/codemirror5 · GitHub > only a css file:
And the same when downloading the latest release.
Yet, I am 100% sure the js file was there, I can even see it in previously downloaded zips.
Something wrong with the build process on GitHub perhaps?