ts: Convert trivial portico modules to TypeScript.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

web/src/portico/communities.js → web/src/portico/communities.ts

@@ -1,6 +1,6 @@
 import $ from "jquery";
 
-function sync_open_organizations_page_with_current_hash() {
+function sync_open_organizations_page_with_current_hash(): void {
     const hash = window.location.hash;
     if (!hash || hash === "#all" || hash === "#undefined") {
         $(".eligible_realm").show();

web/src/portico/desktop-redirect.js → web/src/portico/desktop-redirect.ts

@@ -1,4 +1,4 @@
 import ClipboardJS from "clipboard";
 
 new ClipboardJS("#copy");
-document.querySelector("#copy").focus();
+document.querySelector<HTMLElement>("#copy")!.focus();

web/src/portico/dev-login.js → web/src/portico/dev-login.ts

@@ -3,12 +3,12 @@ import $ from "jquery";
 $(() => {
     // This code will be executed when the user visits /login and
     // dev_login.html is rendered.
-    if ($("[data-page-id='dev-login']").length > 0 && window.location.hash.slice(0, 1) === "#") {
+    if ($("[data-page-id='dev-login']").length > 0 && window.location.hash.startsWith("#")) {
         /* We append the location.hash to the input field with name next so that URL can be
             preserved after user is logged in. See this:
             https://stackoverflow.com/questions/5283395/url-hash-is-persisting-between-redirects */
         $("input[name='next']").each(function () {
-            const new_value = $(this).attr("value") + window.location.hash;
+            const new_value = $(this).attr("value")! + window.location.hash;
             $(this).attr("value", new_value);
         });
     }

web/src/portico/tippyjs.js → web/src/portico/tippyjs.ts

@@ -1,7 +1,7 @@
 import $ from "jquery";
 import tippy from "tippy.js";
 
-function initialize() {
+function initialize(): void {
     tippy("[data-tippy-content]", {
         // Same defaults as set in web app tippyjs module.
         maxWidth: 300,