Add type hints across project

justfile

@@ -17,3 +17,6 @@ typecheck:
 
 test:
   uv run pytest --cov=jetplot --cov-report=term
+
+loop:
+  find {src,tests} -name "*.py" | entr -c just test

src/jetplot/chart_utils.py

@@ -1,5 +1,6 @@
 """Plotting utils."""
 
+from collections.abc import Callable
 from functools import partial, wraps
 from typing import Any, Literal
 
@@ -20,7 +21,7 @@
 ]
 
 
-def figwrapper(fun):
+def figwrapper(fun: Callable[..., Any]) -> Callable[..., Any]:
     """Decorator that adds figure handles to the kwargs of a function."""
 
     @wraps(fun)
@@ -33,7 +34,7 @@ def wrapper(*args, **kwargs):
     return wrapper
 
 
-def plotwrapper(fun):
+def plotwrapper(fun: Callable[..., Any]) -> Callable[..., Any]:
     """Decorator that adds figure and axes handles to the kwargs of a function."""
 
     @wraps(fun)
@@ -52,7 +53,7 @@ def wrapper(*args, **kwargs):
     return wrapper
 
 
-def axwrapper(fun):
+def axwrapper(fun: Callable[..., Any]) -> Callable[..., Any]:
     """Decorator that adds an axes handle to kwargs."""
 
     @wraps(fun)
@@ -70,7 +71,7 @@ def wrapper(*args, **kwargs):
 
 
 @axwrapper
-def noticks(**kwargs):
+def noticks(**kwargs: Any) -> None:
     """
     Clears tick marks (useful for images)
     """
@@ -81,7 +82,13 @@ def noticks(**kwargs):
 
 
 @axwrapper
-def nospines(left=False, bottom=False, top=True, right=True, **kwargs):
+def nospines(
+    left: bool = False,
+    bottom: bool = False,
+    top: bool = True,
+    right: bool = True,
+    **kwargs: Any,
+) -> plt.Axes:
     """
     Hides the specified axis spines (by default, right and top spines)
     """
@@ -160,7 +167,12 @@ def get_bounds(axis: Literal["x", "y"], ax: Axes | None = None) -> tuple[float,
 
 
 @axwrapper
-def breathe(xlims=None, ylims=None, padding_percent=0.05, **kwargs):
+def breathe(
+    xlims: tuple[float, float] | None = None,
+    ylims: tuple[float, float] | None = None,
+    padding_percent: float = 0.05,
+    **kwargs: Any,
+) -> plt.Axes:
     """Adds space between axes and plot."""
     ax = kwargs["ax"]
 
@@ -203,7 +215,7 @@ def yclamp(
     y0: float | None = None,
     y1: float | None = None,
     dt: float | None = None,
-    **kwargs,
+    **kwargs: Any,
 ) -> Axes:
     """Clamp the y-axis to evenly spaced tick marks."""
     ax = kwargs["ax"]
@@ -228,7 +240,7 @@ def xclamp(
     x0: float | None = None,
     x1: float | None = None,
     dt: float | None = None,
-    **kwargs,
+    **kwargs: Any,
 ) -> Axes:
     """Clamp the x-axis to evenly spaced tick marks."""
     ax = kwargs["ax"]

src/jetplot/colors.py

@@ -1,13 +1,14 @@
 """Colorschemes"""
 
+from typing import cast
+
 import numpy as np
 from matplotlib import cm
 from matplotlib import pyplot as plt
 from matplotlib.axes import Axes
 from matplotlib.colors import LinearSegmentedColormap, to_hex
 from matplotlib.figure import Figure
 from matplotlib.typing import ColorType
-from numpy.typing import NDArray
 
 from .chart_utils import noticks
 
@@ -18,24 +19,24 @@ class Palette(list[ColorType]):
     """Color palette based on a list of values."""
 
     @property
-    def hex(self):
+    def hex(self) -> "Palette":
         """Return the palette colors as hexadecimal strings."""
-        return Palette([to_hex(rgb) for rgb in self])
+        return Palette([to_hex(rgb) for rgb in self])  # pyrefly: ignore
 
     @property
     def cmap(self) -> LinearSegmentedColormap:
         """Return the palette as a Matplotlib colormap."""
         return LinearSegmentedColormap.from_list("", self)
 
-    def plot(self, figsize: tuple[int, int] = (5, 1)) -> tuple[Figure, NDArray[Axes]]:
+    def plot(self, figsize: tuple[int, int] = (5, 1)) -> tuple[Figure, list[Axes]]:
         """Visualize the colors in the palette."""
         fig, axs = plt.subplots(1, len(self), figsize=figsize)
         for c, ax in zip(self, axs, strict=True):  # pyrefly: ignore
             ax.set_facecolor(c)
             ax.set_aspect("equal")
             noticks(ax=ax)
 
-        return fig, axs
+        return fig, cast(list[Axes], axs)
 
 
 def cubehelix(
@@ -46,7 +47,7 @@ def cubehelix(
     start: float = 0.0,
     rot: float = 0.4,
     hue: float = 0.8,
-):
+) -> Palette:
     """Cubehelix parameterized colormap."""
     lambda_ = np.linspace(vmin, vmax, n)
     x = lambda_**gamma

src/jetplot/images.py

@@ -1,10 +1,13 @@
 """Image visualization tools."""
 
-from collections.abc import Callable
+from collections.abc import Callable, Iterable
 from functools import partial
+from typing import Any, cast
 
 import numpy as np
 from matplotlib import pyplot as plt
+from matplotlib.axes import Axes
+from matplotlib.image import AxesImage
 from matplotlib.ticker import FixedLocator
 
 from . import colors as c
@@ -15,16 +18,16 @@
 
 @plotwrapper
 def img(
-    data,
-    mode="div",
-    cmap=None,
-    aspect="equal",
-    vmin=None,
-    vmax=None,
-    cbar=True,
-    interpolation="none",
-    **kwargs,
-):
+    data: np.ndarray,
+    mode: str = "div",
+    cmap: str | None = None,
+    aspect: str = "equal",
+    vmin: float | None = None,
+    vmax: float | None = None,
+    cbar: bool = True,
+    interpolation: str = "none",
+    **kwargs: Any,
+) -> AxesImage:
     """Visualize a matrix as an image.
 
     Args:
@@ -86,7 +89,7 @@ def fsurface(
     yrng: tuple[float, float] | None = None,
     n: int = 100,
     nargs: int = 2,
-    **kwargs,
+    **kwargs: Any,
 ) -> None:
     """Plot a 2‑D function as a filled surface."""
     xrng = (-1, 1) if xrng is None else xrng
@@ -112,22 +115,22 @@ def fsurface(
 
 @plotwrapper
 def cmat(
-    arr,
-    labels=None,
-    annot=True,
-    cmap="gist_heat_r",
-    cbar=False,
-    fmt="0.0%",
-    dark_color="#222222",
-    light_color="#dddddd",
-    grid_color=c.gray[9],
-    theta=0.5,
-    label_fontsize=10.0,
-    fontsize=10.0,
-    vmin=0.0,
-    vmax=1.0,
-    **kwargs,
-):
+    arr: np.ndarray,
+    labels: Iterable[str] | None = None,
+    annot: bool = True,
+    cmap: str = "gist_heat_r",
+    cbar: bool = False,
+    fmt: str = "0.0%",
+    dark_color: str = "#222222",
+    light_color: str = "#dddddd",
+    grid_color: str = cast(str, c.gray[9]),
+    theta: float = 0.5,
+    label_fontsize: float = 10.0,
+    fontsize: float = 10.0,
+    vmin: float = 0.0,
+    vmax: float = 1.0,
+    **kwargs: Any,
+) -> tuple[AxesImage, Axes]:
     """Plot confusion matrix."""
     num_rows, num_cols = arr.shape
 
@@ -138,8 +141,8 @@ def cmat(
 
     for x, y, value in zip(xs.flat, ys.flat, arr.flat, strict=True):  # pyrefly: ignore
         color = dark_color if (value <= theta) else light_color
-        annot = f"{{:{fmt}}}".format(value)
-        ax.text(x, y, annot, ha="center", va="center", color=color, fontsize=fontsize)
+        label = f"{{:{fmt}}}".format(value)
+        ax.text(x, y, label, ha="center", va="center", color=color, fontsize=fontsize)
 
     if labels is not None:
         ax.set_xticks(np.arange(num_cols))