[wp-trac] [WordPress Trac] #63254: Introduce development mode for block editor styles

[WordPress Trac]

#63254: Introduce development mode for block editor styles
----------------------------+-----------------------------
 Reporter:  helgatheviking  |      Owner:  (none)
     Type:  defect (bug)    |     Status:  new
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  General         |    Version:
 Severity:  normal          |   Keywords:
  Focuses:                  |
----------------------------+-----------------------------
 When a block script is defined in the `block.json` and registered
 automatically via `register_block_script_handle()` the version is pulled
 from [the script asset php file if it exists](https://github.com/WordPress
 /wordpress-develop/blob/6511cc02f764a3d9c0dd105e5366fdfe63a564cc/src/wp-
 includes/blocks.php#L242). This ensures that the cache is always busted
 when the file is updated.

 Something similar should exist for `register_block_style_handle` as
 otherwise it's a total pain to develop editor styles. I just lost a few
 hours this morning wondering why my styles didn't update even though I am
 using the `@wordpress/scripts` package to recompile them on every change.

 The answer was ultimately that the version is pulled from the
 `block.json`'s "version" property which doesn't change while building.

 Replacing this:
 ```
 $version = ! $is_core_block && isset( $metadata['version'] ) ?
 $metadata['version'] : false;
 $result  = wp_register_style(
         $style_handle_name,
         $style_uri,
         array(),
         $version
 );
 ```

 with this:
 ```
 $block_version = ! $is_core_block && isset( $metadata['version'] ) ?
 $metadata['version'] : false;
 $version = SCRIPT_DEBUG ? filemtime( $style_path_norm ) : $block_version;

 $result  = wp_register_style(
         $style_handle_name,
         $style_uri,
         array(),
         $version
 );
 ```

 Should do the trick. The assets file is another option.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/63254>
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