base.py

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from typing import Callable, List, Optional
 
from pip._internal.req.req_install import InstallRequirement
from pip._internal.req.req_set import RequirementSet
 
InstallRequirementProvider = Callable[
    [str, Optional[InstallRequirement]], InstallRequirement
]
 
 
class BaseResolver:
    def resolve(
        self, root_reqs: List[InstallRequirement], check_supported_wheels: bool
    ) -> RequirementSet:
        raise NotImplementedError()
 
    def get_installation_order(
        self, req_set: RequirementSet
    ) -> List[InstallRequirement]:
        raise NotImplementedError()