from typing import List


def pkg_diff(target: List[str], actual: List[str]) -> tuple[List[str], List[str]]:
    """Compute a diff between target packages and installed packages

    Args:
        target: The target packages
        actual: The actually installed packages

    Returns:
        A tuple with first the missing (not installed) packages
        and second the extraneous (to be uninstalled) packages
    """
    for i, pkg in enumerate(actual):
        try:
            idx = target.index(pkg)
            target.pop(idx)
            actual.pop(i)
        except Exception:
            pass
    return (target, actual)