Convert some common classes/utils to TS

js/src/common/Session.ts

@@ -0,0 +1,55 @@
+import app from '../common/app';
+import User from './models/User';
+import { FlarumRequestOptions } from './Application';
+
+export type LoginParams = {
+  /**
+   * The username/email
+   */
+  identification: string;
+
+  /**
+   * Password
+   */
+  password: string;
+};
+
+/**
+ * The `Session` class defines the current user session. It stores a reference
+ * to the current authenticated user, and provides methods to log in/out.
+ */
+export default class Session {
+  /**
+   * The current authenticated user.
+   */
+  user: User | null;
+
+  /**
+   * The CSRF token.
+   */
+  csrfToken: string;
+
+  constructor(user: User | null, csrfToken: string) {
+    this.user = user;
+    this.csrfToken = csrfToken;
+  }
+
+  /**
+   * Attempt to log in a user.
+   */
+  login(body: LoginParams, options: Omit<FlarumRequestOptions<any>, 'url' | 'body' | 'method'> = {}) {
+    return app.request({
+      method: 'POST',
+      url: `${app.forum.attribute('baseUrl')}/login`,
+      body,
+      ...options,
+    });
+  }
+
+  /**
+   * Log the user out.
+   */
+  logout() {
+    window.location.href = `${app.forum.attribute('baseUrl')}/logout?token=${this.csrfToken}`;
+  }
+}

js/src/common/states/AlertManagerState.ts

@@ -55,7 +55,7 @@ export default class AlertManagerState {
   /**
    * Dismiss an alert.
    */
-  dismiss(key: AlertIdentifier): void {
+  dismiss(key: AlertIdentifier | null): void {
     if (!key || !(key in this.activeAlerts)) return;
 
     delete this.activeAlerts[key];

js/src/common/utils/extractText.js → js/src/common/utils/extractText.ts

@@ -1,15 +1,14 @@
+import type Mithril from 'mithril';
+
 /**
  * Extract the text nodes from a virtual element.
- *
- * @param {VirtualElement} vdom
- * @return {String}
  */
-export default function extractText(vdom) {
+export default function extractText(vdom: Mithril.Children): string {
   if (vdom instanceof Array) {
     return vdom.map((element) => extractText(element)).join('');
   } else if (typeof vdom === 'object' && vdom !== null) {
-    return vdom.children ? extractText(vdom.children) : vdom.text;
+    return vdom.children ? extractText(vdom.children) : String(vdom.text);
   } else {
-    return vdom;
+    return String(vdom);
   }
 }