Register a Gutenberg block from PHP

register_block_type( 'turkerdev/notice', array(
    'editor_script'   => 'turkerdev-blocks',
    'attributes'      => array(
        'tone' => array( 'type' => 'string', 'default' => 'info' ),
    ),
    'render_callback' => 'turkerdev_render_notice',
) );