Platform Binary Selector

def get_platform_string(system: str, machine: str) -> str:
    """
    Returns the platform string for Node.js binary selection.

    Args:
        system: Operating system name (e.g., 'Linux', 'Darwin', 'Windows')
        machine: Machine architecture (e.g., 'x86_64', 'arm64', 'i686')

    Returns:
        Platform string in format 'system-arch' (e.g., 'linux-x64', 'darwin-arm64')
    """
    pass

def map_architecture(machine: str) -> str:
    """
    Maps machine architecture identifier to Node.js architecture naming.
    Handles case-insensitive matching.

    Args:
        machine: Machine architecture identifier

    Returns:
        Normalized architecture string (e.g., 'x64', 'arm64', 'armv7l')
    """
    pass

def construct_binary_url(version: str, platform: str) -> str:
    """
    Constructs the download URL for a Node.js binary.

    Args:
        version: Node.js version string (e.g., 'v18.0.0')
        platform: Platform string (e.g., 'linux-x64')

    Returns:
        Complete download URL for the binary tarball
    """
    pass

def select_architecture_with_fallback(preferred_arch: str, available_architectures: list) -> str:
    """
    Selects architecture with fallback logic (e.g., ARM64 -> x64).

    Args:
        preferred_arch: Preferred architecture (e.g., 'arm64')
        available_architectures: List of available architectures for the version

    Returns:
        Selected architecture string, falling back to 'x64' if preferred unavailable
    """
    pass