public function setRule(string $field, string $label = null, string $rules, array $errors = [])
	{
		$this->rules[$field] = [
			'label' => $label,
			'rules' => $rules,
		];
		$this->customErrors  = array_merge($this->customErrors, [
			$field => $errors,
		]);

		return $this;
	}