ajax call - checking notifications via REST

ajax-call.php

<?php
add_action( 'rest_api_init', 'gnotice_rest_init' );

add_action( 'admin_footer-post.php', 'email_notification_script' );
add_action( 'admin_footer-post-new.php', 'email_notification_script' );

/**
 * Adds script to make ajax call - checking notifications via REST.
 *
 * @return void
 * @since 1.0
 * @author Lax Mariappan <lax@webdevstudios.com>
 */
function email_notification_script() {
	// @see https://wordpress.stackexchange.com/a/398805/103640
	// @see https://github.com/WordPress/gutenberg/issues/17632#issuecomment-583772895
	?>
	<script type="text/javascript">

		const { subscribe,select } = wp.data;
		const { isSavingPost } = select( 'core/editor' );
		var checked = true;
		subscribe( () => {
			if ( isSavingPost() ) {
				checked = false;
			} else {
				if ( ! checked ) {
					checkNotificationAfterPublish();
					checked = true;
				}

			}
		} );

		function checkNotificationAfterPublish(){
			const postId = wp.data.select("core/editor").getCurrentPostId();
			const url = wp.url.addQueryArgs(
				'/wp-json/api-gnotice/v1/check-email-response',
				{ id: postId },
			);
			wp.apiFetch({
				url,
			}).then(
				function(response){
					if(response.message){

						wp.data.dispatch("core/notices").createNotice(
							response.code,
							response.message,
							{
								id: 'email_status_notice',
								isDismissible: true
							}
						);
					}
				}
			);
		};
	</script>
	<?php
}