Show loading icon using softon/sweetalert

I have used sweetalert2 package from this softon/sweetalert for my laravel project. Everything was ok, but it seems confusing, I don't know how to implement loading icon something like swal.showLoading(); using this kind of method. Below is my code on UserController:

public function store(UserRequest $request)
{
    $user_email    = $request['email'];
    $user_active   = User::where('email', 'LIKE', $user_email)->whereNull('deleted_at')->count();
    if ($user_active < 1) {
        $user = User::create([
            'name'      => $request['name'],
            'email'     => $request['email'],
            'password'  => $request['password'],
            'is_active' => 1,
        ]);
        swal()->autoclose(2000)->message('Success', 'Record has been successfully added.', 'success', ['showConfirmButton' => false, 'onOpen' => '() => { swal.showLoading(); }']);
        return redirect()->route('user.index');
    } else {
        swal()->error('Error', 'Adding record failed, ' . $request['email'] . ' already exist.');
        return redirect()->route('user.index');
    }
}

I tried to implement something like this as parameter on swal helper function, but doesn't work.

'onOpen' => '() => { swal.showLoading(); }'

Any ideas how this can be done ?

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