// ...
class Firebase() {
  // ...

  handleCreateUser = (email, password) => this.auth.createUserWithEmailAndPassword(email, password);

  handleLogin = (email, password) => this.auth.signInWithEmailAndPassword(email, password);

  handleLogout = () => this.auth.signOut();

  handleRecoverPassword = (email) => this.auth.sendPasswordResetEmail(email);

  handleChangePassword = (password) => this.auth.updatePassword(password);

};

export default Firebase;