from typing import Optional

def language() -> str:
    """Get the current system language."""


def notification(title: str, message: str, iconPath: str, linkUrl: str, duration: int) -> None:
    """Display a system notification."""


def run_command(command: str, shell: Optional[str] = None) -> int:
    """Execute a shell command."""


def run_with_powershell(command: str) -> int:
    """Execute a command with PowerShell on Windows."""