Whether given item is contained inside the node modules/packages.

        Args:
            item (Package/Module): a package or module.

        Returns:
            bool: True if self is item or item in self's packages/modules.

def _contains(self, item):
        """
        Whether given item is contained inside the node modules/packages.

        Args:
            item (Package/Module): a package or module.

        Returns:
            bool: True if self is item or item in self's packages/modules.
        """
        if self is item:
            return True
        for m in self.modules:
            if item in m:
                return True
        for p in self.packages:
            if item in p:
                return True
        return False