TYP: add typing stubs for _cfinancial.pyx

Author: jorenham

numpy_financial/_cfinancial.pyi

@@ -0,0 +1,16 @@
+from typing import TypeAlias
+
+import numpy as np
+import numpy.typing as npt
+
+_ArrayF64: TypeAlias = npt.NDArray[np.float64]
+
+def nper(
+    rates: _ArrayF64,
+    pmts: _ArrayF64,
+    pvs: _ArrayF64,
+    fvs: _ArrayF64,
+    whens: _ArrayF64,
+    out: _ArrayF64,
+) -> None: ...
+def npv(rates: _ArrayF64, values: _ArrayF64, out: _ArrayF64) -> None: ...

numpy_financial/meson.build

@@ -8,6 +8,7 @@ py.extension_module(
 python_sources = [
     '__init__.py',
     '_financial.py',
+    '_cfinancial.pyi',
     'py.typed',
 ]