Error with libraries ckeditor5-source-editing-codemirror

The issue summary should include steps to arrive at the error, not just a big copy/paste.

Hello, the steps would be to install the module
and in status report it shows the following error:

CKEditor 5 CodeMirror Plugin:
CKEditor 5 CodeMirror plugin not found. Download the latest version of the library and place it in the libraries directory (/libraries/ckeditor5-source-editing-codemirror).
The same steps were done but that build folder does not exist in that library when downloading it

Mirror code:
CodeMirror not found. Download the latest version 5 of the library and place it in the libraries directory (/libraries/codemirror).

Drupal sites should be managed by Composer, so you shouldn't follow that install method.

Add the following to your composer.json

    "require": {
        "wikimedia/composer-merge-plugin": "^2.0"
    },
    "config": {
        "allow-plugins": {
            "wikimedia/composer-merge-plugin": true
        }
    },
    "extra": {
        "merge-plugin": {
            "include": [
                "web/modules/contrib/ckeditor_codemirror/composer.libraries.json"
            ]
        },
    }

Improve description

I think module should not load code mirror plugin is source code plugin is not enabled for particular Text format configuration.

Sorry, wrong issue. Wanted to post in #3371709