"""Execute current JavaScript helpers without booting the live server."""
from pathlib import Path
import shutil
import subprocess


def ui_contract(name: str) -> None:
    node = shutil.which("node")
    assert node is not None, "Node.js is required for UI regression contracts"
    script = Path(__file__).with_name("ui_legacy_contracts.cjs")
    result = subprocess.run([node, str(script), name], capture_output=True, text=True, timeout=20)
    assert result.returncode == 0, result.stdout + result.stderr
    assert f"PASS UI contract: {name}" in result.stdout, result.stdout + result.stderr