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/useDebouncedCallback.ts

@@ -0,0 +1,29 @@
+import * as React from "react";
+
+export default function useDebouncedCallback(
+  callback: (arg0: any) => unknown,
+  wait: number
+) {
+  // track args & timeout handle between calls
+  const argsRef = React.useRef();
+  const timeout = React.useRef<ReturnType<typeof setTimeout>>();
+
+  function cleanup() {
+    if (timeout.current) {
+      clearTimeout(timeout.current);
+    }
+  }
+
+  // make sure our timeout gets cleared if consuming component gets unmounted
+  React.useEffect(() => cleanup, []);
+  return function (...args: any) {
+    argsRef.current = args;
+    cleanup();
+    timeout.current = setTimeout(() => {
+      if (argsRef.current) {
+        // @ts-expect-error ts-migrate(2556) FIXME: Expected 1 arguments, but got 0 or more.
+        callback(...argsRef.current);
+      }
+    }, wait);
+  };
+}