Verkleinern der Ausgabe des inline CSS Codes vom WordPress Core bzw. Gutenberg ('global-styles-inline-css').php

/**
 * Remove bloated inline core color styles.
 *
 * @param \WP_Theme_JSON_Data $theme_json Class to access and update the underlying data.
 *
 * @return \WP_Theme_JSON_Data
 */
add_filter(
	'wp_theme_json_data_default',
	function( $theme_json ) {
		$data = $theme_json->get_data();

		// If you want to debug, use echo '<!-- nxt debug --><pre>'; print_r($theme_json); echo '</pre>';

		// Remove default color palette.
		$data['settings']['color']['palette']['default'] = [];
		
		// Remove default duotone.
		$data['settings']['color']['duotone']['default'] = [];
		
		// Remove default gradients.
		$data['settings']['color']['gradients']['default'] = [];
		
		// Remove shadow presets.
		$data['settings']['shadow']['presets']['default'] = [];
		
		// Note: With this method, you can only overwrite "settings", not "styles" or other sub fields of the array, e.g. $data['styles']['elements']['button']['color'] = [];
		
		// Update the theme data.
		$theme_json->update_with( $data );
		
		return $theme_json;
	}
);
#endregion Clean Up WordPress