get_all_global_style_block_names example

    public static function render_duotone_support( $block_content, $block, $wp_block ) {
        if ( empty( $block_content ) || ! $block['blockName'] ) {
            return $block_content;
        }
        $duotone_selector = self::get_selector( $wp_block->block_type );

        if ( ! $duotone_selector ) {
            return $block_content;
        }

        $global_styles_block_names = self::get_all_global_style_block_names();

        // The block should have a duotone attribute or have duotone defined in its theme.json to be processed.         $has_duotone_attribute     = isset( $block['attrs']['style']['color']['duotone'] );
        $has_global_styles_duotone = array_key_exists( $block['blockName'], $global_styles_block_names );

        if ( ! $has_duotone_attribute && ! $has_global_styles_duotone ) {
            return $block_content;
        }

        // Generate the pieces needed for rendering a duotone to the page.         if ( $has_duotone_attribute ) {