enqueue_block_assets action ignores script modules

[jonsurrell]

​The enqueue_block_assets action is used to add scripts and styles in the block editor's iframe.

It should be possible to add script modules to the block editor's iframe as well.

See:

• ​_wp_get_iframed_editor_assets and ​its documentation.
• ​The WP_Script_Modules class.
• ​The block editor Iframe component in Gutenberg.

This will likely require a new method or exposing more of the script modules internal data so that a specific WP_Script_Modules instance can be used for the iframed assets. See #60597.

Trac ticket: https://core.trac.wordpress.org/ticket/64360

[jonsurrell]

I've have a functional implementation in ​https://github.com/WordPress/wordpress-develop/pull/10597 and ​https://github.com/WordPress/gutenberg/pull/73765.

The changes seem straightforward, the only question may be around how to "clone" the global $wp_script_modules instance.

I'm sharing the work informationally, not to reserve this task for myself if folks are interested in working on it.

[jonsurrell]

@ellatrix I'd like to get your thoughts on this. The editor iframe and script modules are incompatible right now. Have you run into or considered this at all?

I've done some work to capture script modules for inclusion in the editor:

I've have a functional implementation in ​https://github.com/WordPress/wordpress-develop/pull/10597 and ​https://github.com/WordPress/gutenberg/pull/73765.

@westonruter had ​some good feedback about a more general way to inject some HTML into the editor.