from dataclasses import dataclass
from typing import Any, Optional, Tuple


@dataclass(frozen=True)
class LayerSpec:
    native_name: str
    gds: Any
    aliases: Tuple[str, ...] = ()
    description: str = ""


@dataclass(frozen=True)
class XSectionSpec:
    name: str
    layers: Tuple[Any, ...]
    growth: Tuple[Any, ...]
    growy: Optional[Any] = None