Method field

libcst/_nodes/base.py:461–469

A helper that allows us to easily use CSTNodes in dataclass constructor defaults without accidentally aliasing nodes by identity across multiple instances.

(cls, *args: object, **kwargs: object)

    @classmethod
    # pyre-fixme[3]: Return annotation cannot be `Any`.
    def field(cls, *args: object, **kwargs: object) -> Any:
        """
        A helper that allows us to easily use CSTNodes in dataclass constructor
        defaults without accidentally aliasing nodes by identity across multiple
        instances.
        """
        # pyre-ignore Pyre is complaining about CSTNode not being instantiable,
        # but we're only going to call this from concrete subclasses.
        return field(default_factory=lambda: cls(*args, **kwargs))


class BaseLeaf(CSTNode, ABC):