Block Bindings: Prepare the ground to define fieldsList on the server.

src/wp-admin/edit-form-blocks.php

@@ -119,6 +119,7 @@ static function ( $classes ) {
 			'name'        => $source->name,
 			'label'       => $source->label,
 			'usesContext' => $source->uses_context,
+			'args'        => $source->args,
 		);
 	}
 	$script = sprintf( 'for ( const source of %s ) { wp.blocks.registerBlockBindingsSource( source ); }', wp_json_encode( $filtered_sources ) );

src/wp-admin/site-editor.php

@@ -145,6 +145,7 @@ static function ( $classes ) {
 			'name'        => $source->name,
 			'label'       => $source->label,
 			'usesContext' => $source->uses_context,
+			'args'        => $source->args,
 		);
 	}
 	$script = sprintf( 'for ( const source of %s ) { wp.blocks.registerBlockBindingsSource( source ); }', wp_json_encode( $filtered_sources ) );

src/wp-admin/widgets-form-blocks.php

@@ -60,6 +60,7 @@
 			'name'        => $source->name,
 			'label'       => $source->label,
 			'usesContext' => $source->uses_context,
+			'args'        => $source->args,
 		);
 	}
 	$script = sprintf( 'for ( const source of %s ) { wp.blocks.registerBlockBindingsSource( source ); }', wp_json_encode( $filtered_sources ) );

src/wp-includes/class-wp-block-bindings-registry.php

@@ -42,6 +42,7 @@ final class WP_Block_Bindings_Registry {
 		'label',
 		'get_value_callback',
 		'uses_context',
+		'args',
 	);
 
 	/**

src/wp-includes/class-wp-block-bindings-source.php

@@ -43,6 +43,14 @@ final class WP_Block_Bindings_Source {
 	 */
 	private $get_value_callback;
 
+	/**
+	 * Provide fields that will be shown in the Block Bindings UI.
+	 *
+	 * @since 6.8.0
+	 * @var array
+	 */
+	public $args;
+
 	/**
 	 * The context added to the blocks needed by the source.
 	 *

src/wp-includes/class-wp-customize-widgets.php

@@ -875,6 +875,7 @@ public function enqueue_scripts() {
 						'name'        => $source->name,
 						'label'       => $source->label,
 						'usesContext' => $source->uses_context,
+						'args'        => $source->args,
 					);
 				}
 				$script = sprintf( 'for ( const source of %s ) { wp.blocks.registerBlockBindingsSource( source ); }', wp_json_encode( $filtered_sources ) );