chore: Move to Typescript (#2783)

This PR moves the entire project to Typescript. Due to the ~1000 ignores this will lead to a messy codebase for a while, but the churn is worth it – all of those ignore comments are places that were never type-safe previously.

closes #1282

app/hooks/useSessions.ts

@@ -0,0 +1,25 @@
+import * as React from "react";
+import { getCookie } from "tiny-cookie";
+
+type Session = {
+  url: string;
+  logoUrl: string;
+  name: string;
+  teamId: string;
+};
+
+function loadSessionsFromCookie(): Session[] {
+  const sessions = JSON.parse(getCookie("sessions") || "{}");
+  return Object.keys(sessions).map((teamId) => ({
+    teamId,
+    ...sessions[teamId],
+  }));
+}
+
+export default function useSessions() {
+  const [sessions, setSessions] = React.useState(loadSessionsFromCookie);
+  const reload = React.useCallback(() => {
+    setSessions(loadSessionsFromCookie());
+  }, []);
+  return [sessions, reload];
+}