WordPress Admin CodeMirror (wp.codeEditor)

WP bundles CodeMirror 5 plus its linter add-ons. Plugins almost never use it because the entry point is one underused function (wp_enqueue_code_editor) and the JS init is split between two files. This skill is the bootstrap recipe.

When to use this skill

Trigger when ANY of the following is true:

• The user is adding a <textarea> to admin for CSS / JSON / JS / HTML / PHP / SQL / regex / Markdown / YAML content and wants syntax highlighting (NOT the block editor).
• Code references wp_enqueue_code_editor, wp_get_code_editor_settings, wp.codeEditor, wp.CodeMirror, wp_code_editor_settings, code-editor script handle.
• The user is building a "custom CSS field", "snippet editor", "JSON config editor", "webhook payload field", "regex builder", "shortcode preview", "rules engine".
• The user mentions CodeMirror, Monaco, Ace, Prism specifically in a WP-admin context — and the answer is "use the bundled CodeMirror".