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draccus / fields.py
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import dataclasses


# ruff: noqa: A002
def field(
    *,
    default=dataclasses.MISSING,
    default_factory=dataclasses.MISSING,
    init=True,
    repr=True,
    hash=None,
    compare=True,
    metadata=None,
    is_mutable=False,
):
    if default is not dataclasses.MISSING and default_factory is not dataclasses.MISSING:
        raise ValueError("cannot specify both default and default_factory")
    if is_mutable and default is not dataclasses.MISSING:
        from copy import deepcopy

        copy_val = default

        def default_factory():
            return deepcopy(copy_val)

        default = dataclasses.MISSING

    return dataclasses.field(
        default=default,
        default_factory=default_factory,
        init=init,
        repr=repr,
        hash=hash,
        compare=compare,
        metadata=metadata,
    )