Weston Ruter c97bb4a4bd Script Loader: Introduce fetchpriority for Scripts and Script Modules. ...

* Allow scripts and script modules to be registered with a `fetchpriority` of `auto` (default), `high`, `low`:
  * When registering a script, add a `fetchpriority` arg to go alongside the `strategy` arg which was added for loading scripts with the `defer` and `async` loading strategies. See #12009. 
  * For script modules, introduce an `$args` array parameter with a `fetchpriority` key to the `wp_register_script_module()`, and `wp_enqueue_script_module()` functions (and their respective underlying `WP_Script_Modules::register()` and `WP_Script_Modules::enqueue()` methods). This `$args` parameter corresponds with the same parameter used when registering non-module scripts.
  * Also for script modules, introduce `WP_Script_Modules::set_fetchpriority()` to override the `fetchpriority` for what was previously registered.
  * Emit a `_doing_it_wrong()` warning when an invalid `fetchpriority` value is used, and when `fetchpriority` is added to a script alias.
  * Include `fetchpriority` as an attribute on printed `SCRIPT` tags as well as on preload `LINK` tags for static script module dependencies.
* Use a `fetchpriority` of `low` by default for:
  * Script modules used with the Interactivity API. For overriding this default in blocks, see [https://github.com/WordPress/gutenberg/issues/71366 Gutenberg#71366].
  * The `comment-reply` script.
* Improve type checks and type hints.

Developed in [https://github.com/WordPress/wordpress-develop/pull/8815 GitHub PR], with [https://github.com/WordPress/gutenberg/pull/70173 companion for Gutenberg].

Props westonruter, jonsurrell, swissspidy, luisherranz, kraftbj, audrasjb, dennysdionigi.
Fixes #61734.

Built from https://develop.svn.wordpress.org/trunk@60704


git-svn-id: http://core.svn.wordpress.org/trunk@60040 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2025-09-03 22:17:39 +00:00

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