spatie / laravel-collection-macros

src/macros/firstOrFail.php

<?php

use Illuminate\Support\Collection;
use Spatie\CollectionMacros\Exceptions\CollectionItemNotFound;

/*
 * Get the first item. Throws CollectionItemNotFound if the item was not found.
 *
 * @return mixed
 */
Collection::macro('firstOrFail', function () {
    if (! is_null($item = $this->first())) {

The variable $this does not exist. Did you forget to declare it?

        return collect($item);
    }

    throw new CollectionItemNotFound('No items found in collection.');
});