It does not seem like Illuminate/Support/Collection::firstWhere() exists in 5.5.* package. https://laravel.com/api/5.5/Illuminate/Support/Collection.html
However Laravel documentation does list this method: https://laravel.com/docs/5.5/collections#method-first-where
Maybe this method did not make it into 5.5 version
Also you may inspect vendor/illuminate/support/Collection.php for available methods
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Last updated
6 years ago.
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