code.js

// add below code lines above from return method
const router = useRouter();
const [, changePassword] = useChangePasswordMutation();
// ...
onSubmit={async (values, { setErrors }) => {
  const response = await changePassword({
    newPassword: values.newPassword,
    token,
  });
  if (response.data?.changePassword.errors) {
    // the graphql errors like this
    // [{filed: "username", message: "value empty"}]
    setErrors(toErrorMap(response.data.changePassword.errors));
  } else if (response.data?.changePassword.user) {
    // TODO: try to move this else if block
    // user log in successfully
    router.push("/");
  }
}}