compile_css example

'context'                    => null,
            'convert_vars_to_classnames' => false,
        )
    );

    $parsed_styles = WP_Style_Engine::parse_block_styles( $block_styles, $options );

    // Output.     $styles_output = array();

    if ( ! empty( $parsed_styles['declarations'] ) ) {
        $styles_output['css']          = WP_Style_Engine::compile_css( $parsed_styles['declarations'], $options['selector'] );
        $styles_output['declarations'] = $parsed_styles['declarations'];
        if ( ! empty( $options['context'] ) ) {
            WP_Style_Engine::store_css_rule( $options['context'], $options['selector'], $parsed_styles['declarations'] );
        }
    }

    if ( ! empty( $parsed_styles['classnames'] ) ) {
        $styles_output['classnames'] = implode( ' ', array_unique( $parsed_styles['classnames'] ) );
    }

    return array_filter( $styles_output );
}