def validate_bun(bun_path: Path | None = None):
    """Validate bun if a custom bun path is specified to ensure the bun version meets requirements.

    Args:
        bun_path: The path to the bun executable. If None, the default bun path is used.

    Raises:
        Exit: If custom specified bun does not exist or does not meet requirements.
    """
    bun_path = bun_path or path_ops.get_bun_path()

    if bun_path is None:
        return

    if not path_ops.samefile(bun_path, constants.Bun.DEFAULT_PATH):
        console.info(f"Using custom Bun path: {bun_path}")
        bun_version = get_bun_version()
        if bun_version is None:
            console.error(
                "Failed to obtain bun version. Make sure the specified bun path in your config is correct."
            )
            raise click.exceptions.Exit(1)
        if bun_version < version.parse(constants.Bun.MIN_VERSION):
            console.warn(
                f"Reflex requires bun version {constants.Bun.MIN_VERSION} or higher to run, but the detected version is "
                f"{bun_version}. If you have specified a custom bun path in your config, make sure to provide one "
                f"that satisfies the minimum version requirement. You can upgrade bun by running [bold]bun upgrade[/bold]."
            )
Validate bun if a custom bun path is specified to ensure the bun version meets requirements.

    Args:
        bun_path: The path to the bun executable. If None, the default bun path is used.

    Raises:
        Exit: If custom specified bun does not exist or does not meet requirements.
    
reflex/utils/prerequisites.py