convert notifications to typescript

assets/js/notifications.ts

@@ -5,19 +5,17 @@
 import { fetchJson, handleError } from './utils/requests';
 import { $ } from './utils/dom';
 import { delegate } from './utils/events';
+import { assertNotNull, assertNotUndefined } from './utils/assert';
 import store from './utils/store';
 
 const NOTIFICATION_INTERVAL = 600000,
       NOTIFICATION_EXPIRES = 300000;
 
-function makeRequest(verb) {
-  return fetchJson(verb, '/notifications/unread').then(handleError);
-}
-
 function bindSubscriptionLinks() {
   delegate(document, 'fetchcomplete', {
     '.js-subscription-link': event => {
-      const target = event.target.closest('.js-subscription-target');
+      const target = assertNotNull(event.target.closest('.js-subscription-target'));
+
       event.detail.text().then(text => {
         target.outerHTML = text;
       });
@@ -30,42 +28,42 @@ function getNewNotifications() {
     return;
   }
 
-  makeRequest('GET').then(response => response.json()).then(({ notifications }) => {
+  fetchJson('GET', '/notifications/unread')
-    updateNotificationTicker(notifications);
+    .then(handleError)
-    storeNotificationCount(notifications);
+    .then(response => response.json())
+    .then(({ notifications }) => {
+      updateNotificationTicker(notifications);
+      storeNotificationCount(notifications);
 
-    setTimeout(getNewNotifications, NOTIFICATION_INTERVAL);
+      setTimeout(getNewNotifications, NOTIFICATION_INTERVAL);
-  });
+    });
 }
 
-function updateNotificationTicker(notificationCount) {
+function updateNotificationTicker(notificationCount: string | null) {
-  const ticker = $('.js-notification-ticker');
+  const ticker = assertNotNull($<HTMLSpanElement>('.js-notification-ticker'));
   const parsedNotificationCount = Number(notificationCount);
 
-  ticker.dataset.notificationCount = parsedNotificationCount;
+  ticker.dataset.notificationCount = parsedNotificationCount.toString();
-  ticker.textContent = parsedNotificationCount;
+  ticker.textContent = parsedNotificationCount.toString();
 }
 
-
+function storeNotificationCount(notificationCount: string) {
-function storeNotificationCount(notificationCount) {
   // The current number of notifications are stored along with the time when the data expires
   store.setWithExpireTime('notificationCount', notificationCount, NOTIFICATION_EXPIRES);
 }
 
-
+export function setupNotifications() {
-function setupNotifications() {
   if (!window.booru.userIsSignedIn) return;
 
   // Fetch notifications from the server at a regular interval
   setTimeout(getNewNotifications, NOTIFICATION_INTERVAL);
 
   // Update the current number of notifications based on the latest page load
-  storeNotificationCount($('.js-notification-ticker').dataset.notificationCount);
+  const ticker = assertNotNull($<HTMLSpanElement>('.js-notification-ticker'));
+  storeNotificationCount(assertNotUndefined(ticker.dataset.notificationCount));
 
   // Update ticker when the stored value changes - this will occur in all open tabs
   store.watch('notificationCount', updateNotificationTicker);
 
   bindSubscriptionLinks();
 }
-
-export { setupNotifications };

assets/js/utils/events.ts

@@ -1,5 +1,7 @@
 // DOM events
 
+import '../../types/ujs';
+
 export interface PhilomenaAvailableEventsMap {
   dragstart: DragEvent,
   dragover: DragEvent,
@@ -9,7 +11,8 @@ export interface PhilomenaAvailableEventsMap {
   drop: DragEvent,
   click: MouseEvent,
   submit: Event,
-  reset: Event
+  reset: Event,
+  fetchcomplete: FetchcompleteEvent
 }
 
 export interface PhilomenaEventElement {

assets/js/utils/store.ts

@@ -38,9 +38,9 @@ export default {
   },
 
   // Watch changes to a specified key - returns value on change
-  watch(key: string, callback: (value: unknown) => void) {
+  watch<Value = unknown>(key: string, callback: (value: Value | null) => void) {
     const handler = (event: StorageEvent) => {
-      if (event.key === key) callback(this.get(key));
+      if (event.key === key) callback(this.get<Value>(key));
     };
     window.addEventListener('storage', handler);
     return () => window.removeEventListener('storage', handler);