Flash message after login laravel

I'm using Laravel 5.4 with the pre-built auth library.

I would like to have a sweet alert (or popup) come up when a user sucessfully logins but I can't find where the logic is where the redirect to happens.

So:

User logins successfully

Gets forwarded to home controller (need to find this in the code and attach a flash message or something else?)

In my view detect if there's a flash message and make a if there's a flash message in memory so I can then query it with Javascript and show an alert box.

Edit:

I already have this set and it's fine:

use AuthenticatesUsers;

/**
 * Where to redirect users after login.
 *
 * @var string
 */
protected $redirectTo = '/';

but I need to find where this is referenced? and add a flash message

Thanks

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