Fix mypy error: A function returning TypeVar should receive at least …

…one argument containing the same TypeVar
fastapi · Sep 3, 2024 · c97aff6 · c97aff6
1 parent e13d1d8
commit c97aff6
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diff --git a/requirements-tests.txt b/requirements-tests.txt
@@ -5,7 +5,7 @@ pytest-cov >=2.10.0,<6.0.0
 coverage[toml] >=6.2,<8.0
 pytest-xdist >=1.32.0,<4.0.0
 pytest-sugar >=0.9.4,<1.1.0
-mypy ==1.4.1
+mypy >=1.10.1
 ruff ==0.6.3
 # Needed explicitly by typer-slim
 rich >=10.11.0

diff --git a/typer/utils.py b/typer/utils.py
@@ -15,6 +15,7 @@
 from .models import ArgumentInfo, OptionInfo, ParameterInfo, ParamMeta
 
 T = TypeVar("T")
+TypeAliasTypeVar = TypeAliasType("TypeAliasTypeVar", value=T, type_params=(T,))
 
 
 def _param_type_to_user_string(param_type: Type[ParameterInfo]) -> str:
@@ -200,7 +201,7 @@ def get_params_from_function(func: Callable[..., Any]) -> Dict[str, ParamMeta]:
     return params
 
 
-def get_original_type(alias: TypeAliasType) -> T:
+def get_original_type(alias: TypeAliasTypeVar[T]) -> T:
     """Return the original type of an alias.
 
     Examples