move some files around to confuse everyone

src/util/persistent_state.ts

@@ -1,38 +0,0 @@
-import { Dispatch, SetStateAction, useCallback, useState } from "react";
-
-// like useState, but it is persisted in localStorage
-// important: values must be JSON-(de-)serializable
-export function usePersistentState<T>(key: string, initial: T): [T, Dispatch<SetStateAction<T>>] {
-  const [state, setState] = useState(() => {
-    const recovered = localStorage.getItem(key);
-    let parsed;
-    if (recovered !== null) {
-      try {
-        parsed = JSON.parse(recovered);
-        return parsed;
-      } catch (e) {
-        // console.warn(`failed to recover state for option '${key}'`, e,
-        //  '(this is normal when running the app for the first time)');
-      }
-    }
-    return initial;
-  });
-
-  const setStateWrapped = useCallback((val: SetStateAction<T>) => {
-    setState((oldState: T) => {
-      let newVal;
-      if (typeof val === 'function') {
-        // @ts-ignore: i don't understand why 'val' might not be callable
-        newVal = val(oldState);
-      }
-      else {
-        newVal = val;
-      }
-      const serialized = JSON.stringify(newVal);
-      localStorage.setItem(key, serialized);
-      return newVal;
-    });
-  }, [setState]);
-
-  return [state, setStateWrapped];
-}