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/usePrevious.ts

@@ -0,0 +1,11 @@
+import * as React from "react";
+
+export default function usePrevious<T>(value: T): T | void {
+  const ref = React.useRef<T>();
+
+  React.useEffect(() => {
+    ref.current = value;
+  });
+
+  return ref.current;
+}