react strict mode use effect double request workaround

strict.tsx

function useVerifySignup(reqState: RequestState['state'], token: string): void {
  const dispatch = useDispatch();

  useEffect(() => {
    // necessary because the API request is not idempotent, you can only verify once
    // and react strict mode tries to force effects be idempotent for future versions
    // https://github.com/facebook/react/issues/24502#issuecomment-1118846544
    let isStrictModeDevRemount = false;

    async function verify(): Promise<void> {
      if (reqState === `idle` && !isStrictModeDevRemount) {
        const action = await verifySignupEmail(token);
        if (!isStrictModeDevRemount) {
          dispatch(action);
        }
      }
    }

    verify();

    return () => {
      isStrictModeDevRemount = Current.env.isDev();
    };
  }, [reqState, token, dispatch]);
}