Type system extensions for use with the pyre type checker
Project description
Pyre Extensions
This module defines extensions to the standard “typing” module that are supported by the Pyre typechecker.
none_throws
Function to make assumptions about Optionals explicit. The function will raise an
assertion error if passed None and return the value otherwise.
ParameterSpecification
ParameterSpecifications are a special kind of type variable that captures callable parameter
specifications (known as argspecs in the runtime and inspect library) instead of types, allowing
the typing of decorators which transform the return type of the given callable.
For example:
from typing import TypeVar, Callable, List
from pyre_extensions import ParameterSpecification
Tparams = ParameterSpecification("Tparams")
Treturn = TypeVar("Treturn")
def unwrap(f: Callable[Tparams, List[Treturn]) -> Callable[Tparams, Treturn]: ...
@unwrap
def foo(x: int, y: str, z: bool = False) -> List[int]:
return [1, 2, 3]
decorates foo into a callable that returns int, but still has the same parameters, including their names and whether they are required.
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