add prettier for auto formatting (#231)

* [Prettier] Add "prettier"

Makes the formatting of the code consistent.
By using the eslint-plugin-prettier formatting issues will be highlighted as a lint error.
These errors will be auto fixed by running "lint --fix" (which can be done automatically on file save)

* [Prettier] Add "prettier" - Fix formatting

src/util/useLocalStorage.tsx

@@ -5,14 +5,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-import React, {
-    useState,
-    Dispatch,
-    SetStateAction,
-    useReducer,
-    Reducer,
-    useCallback,
-} from 'react';
+import React, { useState, Dispatch, SetStateAction, useReducer, Reducer, useCallback } from 'react';
 import storage from 'util/localStorage';
 
 // eslint-disable-next-line max-len
@@ -21,19 +14,18 @@ export default function useLocalStorage<T>(
     defaultValue: T | (() => T),
 ): [T, Dispatch<SetStateAction<T>>] {
     const initialState = defaultValue instanceof Function ? defaultValue() : defaultValue;
-    const [storedValue, setStoredValue] = useState<T>(
-        storage.getItem(key, initialState),
-    );
+    const [storedValue, setStoredValue] = useState<T>(storage.getItem(key, initialState));
 
     const setValue = useCallback<React.Dispatch<React.SetStateAction<T>>>(
-        ((value) => {
+        (value) => {
             setStoredValue((prevValue) => {
                 // Allow value to be a function so we have same API as useState
                 const valueToStore = value instanceof Function ? value(prevValue) : value;
                 storage.setItem(key, valueToStore);
                 return valueToStore;
             });
-        }), [key],
+        },
+        [key],
     );
 
     return [storedValue, setValue];