_.js

const [editMode] = useEditMode()
const { loadData } = useGithubFile({
  path: 'src/navigation.json',
  parse: JSON.parse,
  serialize: JSON.stringify,
})

const [githubNavItems, setGithubNavItems] = useState(navigation)

useEffect(() => {
  if (!editMode) return
  loadData().then(setGithubNavItems)
}, [editMode])

const navItems = useMemo(() => {
  if (editMode) {
    return githubNavItems
  }
  return navigation
}, [editMode, navigation, githubNavItems])