const User = {
    getPassword() {
        return new Promise(resolve => {
            setTimeout(resolve, 100, "foo");
        });
    }
};
const userInfoURL = "/";
class Example {
    static async login() {
        let password = await User.getPassword();
        alert(password); // this works, password is shown
        return fetch(userInfoURL, {
            method: 'GET',
            headers: {
                'Authorization': password,
                'Content-Type': 'application/json'
            }
        })
    }
}
Example.login()
    .then(response => response.json())
    .then(data => { console.log("worked", data); })
    .catch(err => { console.error("failed", err); });