vibrar muitos argumentos posicionais 0 esperados, mas eu encontrei
const Notification(this.description, this.nom_ligne, this.created_at);
Thoughtless Teira
const Notification(this.description, this.nom_ligne, this.created_at);
Notification notif =
Notification(description: u["description"], nom_ligne: u["nom_ligne"], created_at: u["created_at"]);