wp metabox field in gutenberg

	if (false)
	{


		function myprefix_register_meta() {
			register_meta('vvid', '_myprefix_text_metafield', array(
				'show_in_rest' => true,
				'type' => 'string',
				'single' => true,
				'sanitize_callback' => 'sanitize_text_field',
				'auth_callback' => function() {
					return current_user_can('edit_posts');
				}
			));
		}
		add_action('init', 'myprefix_register_meta');

		function myprefix_add_meta_box() {
			add_meta_box(
				'myprefix_post_options_metabox',
				'Post Options',
				'myprefix_post_options_metabox_html',
				'vvid',
				'normal',
				'default',
				array('__back_compat_meta_box' => true)
			);
		}

		add_action( 'add_meta_boxes', 'myprefix_add_meta_box' );

		function myprefix_post_options_metabox_html($post) {
			$field_value = get_post_meta($post->ID, '_myprefix_text_metafield', true);
			wp_nonce_field( 'myprefix_update_post_metabox', 'myprefix_update_post_nonce' );
			?>
			<p>
				<label for="myprefix_text_metafield"><?php esc_html_e( 'Custom fielddddddddd', 'textdomain' ); ?></label>
				<br />
				<input class="widefat" type="text" name="myprefix_text_metafield" id="myprefix_text_metafield" value="<?php echo esc_attr( $field_value ); ?>" />
			</p>
			<?php
		}

		function myprefix_save_post_metabox($post_id, $post) {

			$edit_cap = get_post_type_object( $post->post_type )->cap->edit_post;
			if( !current_user_can( $edit_cap, $post_id )) {
				return;
			}
			if( !isset( $_POST['myprefix_update_post_nonce']) || !wp_verify_nonce( $_POST['myprefix_update_post_nonce'], 'myprefix_update_post_metabox' )) {
				return;
			}

			if(array_key_exists('myprefix_text_metafield', $_POST)) {
				update_post_meta(
					$post_id,
					'_myprefix_text_metafield',
					sanitize_text_field($_POST['myprefix_text_metafield'])
				);
			}
		}

		add_action( 'save_post', 'myprefix_save_post_metabox', 10, 2 );

		function myprefix_enqueue_assets() {
			wp_enqueue_script(
				'myprefix-gutenberg-sidebar',
				plugins_url( 'custom_files/gutenberg_editor_mods.js', __FILE__ ),
				array( 'wp-plugins', 'wp-edit-post', 'wp-element', 'wp-components', 'wp-data' )
			);
		}
		add_action( 'enqueue_block_editor_assets', 'myprefix_enqueue_assets' );

	}