def METHOD_NAME(self) -> List[str]:
    """Reads and parses feature flag definition in frontend."""
    with utils.open_file(FRONTEND_FEATURE_NAMES_PATH, 'r') as f:
        content = f.read()
    body_content = ENUM_BODY_REGEXP.search(content)
    # Ruling out the possibility of None for mypy type checking.
    assert body_content is not None
    body = body_content.group(1)
    return [name for _, name in ENUM_MEMBER_REGEXP.findall(body)]