converting auth.js to reasonml

auth.js

const isBrowser = typeof window !== `undefined`

export const setUser = user => (window.localStorage.gatsbyUser = JSON.stringify(user))

const getUser = () =>
  window.localStorage.gatsbyUser
    ? JSON.parse(window.localStorage.gatsbyUser)
    : {}

export const isLoggedIn = () => {
  if (!isBrowser) return false

  const user = getUser()
  if (user) return !!user.username
}

export const getCurrentUser = () => isBrowser && getUser()

export const logout = callback => {
  if (!isBrowser) return
  setUser({})
  callback()
}

Auth.re

[@bs.val] external browserEnv: bool = "process.browser";

let isBrowser = browserEnv;
Js.log2("isBrowser: ", isBrowser);

/*   {"email_verified":true,"phone_number_verified":false,"phone_number":"+5555555555","email":"aarmand.inbox@gmail.com","username":"idkjs"} */
let getUser = () => {
      let user = Dom.Storage.(localStorage |> getItem("gatsbyUser"));
      let result =
        switch (user) {
        | None => ""
        | Some(user) => user
        };
      Js.log2("result", result);
    };
    getUser();

let getUser = () => {
  let user = Dom.Storage.(localStorage |> getItem("gatsbyUser"));
  let result = switch user {
  | None => ""
  | Some(user) => user
  }
  
  Js.log(result);
  result;

};
let user = getUser();
// returns
// {"email_verified":true,"phone_number_verified":false,"phone_number":"+5555555555","email":"aarmand.inbox@gmail.com","username":"idkjs"}
Js.log2("USER",user);

let isLoggedIn = (isBrowser, user) => {
  let user = getUser();
  switch(isBrowser, user) {
    |(false,_) => ()
    |(true, user) => {
      switch user {
      | None => ""
      | Some(u) => u
    }}
  }
};

let getCurrentUser = () => if (isBrowser) {
  let user = getUser();
  /* return the user */
  user;
};