react-hook-auth-block15.jsx

import React, { useState } from "react"
...
function App(props) {
  const existingTokens = JSON.parse(localStorage.getItem("tokens"));
  const [authTokens, setAuthTokens] = useState(existingTokens);
  
  const setTokens = (data) => {
    localStorage.setItem("tokens", JSON.stringify(data));
    setAuthTokens(data);
  }

  return (
    <AuthContext.Provider value={{ authTokens, setAuthTokens: setTokens }}>
     ...
    </AuthContext.Provider>
  );
}
...