It’s a rather open ended question…
Basically, the core menu functionality are in:
- wp-amin/menu.php (initialize/display)
- wp-admin/js/common.dev.js (fold/unfold and store state scripts)
- wp-admin/includes/plugin.php (functions that allow plugins to add extra items)
But these then make use of a wide variety of other WP functionality. If your goal is to create menu code for a separate app, as I’m suspecting, you’re in for copying entire chunks of the WP code base so you might as well use WP altogether.
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