feat: adding more type annotations

components/dash-core-components/dash_core_components_base/__init__.py

@@ -13,7 +13,7 @@
     send_string,
 )
 
-__all__ = _components + [
+__all__ = _components + [  # type: ignore[reportUnsupportedDunderAll]
     "send_bytes",
     "send_data_frame",
     "send_file",

components/dash-table/dash_table_base/__init__.py

@@ -1,3 +1,5 @@
+# type: ignore
+
 import os as _os
 import sys as _sys
 import json

components/dash-table/src/dash-table/dash/DataTable.js

@@ -472,25 +472,14 @@ export const propTypes = {
      * View the documentation examples to learn more.
      *
      */
-    fixed_columns: PropTypes.oneOfType([
-        PropTypes.exact({
-            /**
-             * Example `{'headers':False, 'data':0}` No columns are fixed (the default)
-             */
-
-            data: PropTypes.oneOf([0]),
-            headers: PropTypes.oneOf([false])
-        }),
-
-        PropTypes.exact({
-            /**
-             * Example `{'headers':True, 'data':1}` one column is fixed.
-             */
+    fixed_columns: PropTypes.exact({
+        /**
+         * Example `{'headers':False, 'data':0}` No columns are fixed (the default)
+         */
 
-            data: PropTypes.number,
-            headers: PropTypes.oneOf([true]).isRequired
-        })
-    ]),
+        data: PropTypes.number,
+        headers: PropTypes.bool
+    }),
 
     /**
      * `fixed_rows` will "fix" the set of rows so that
@@ -505,24 +494,14 @@ export const propTypes = {
      * way that your columns are rendered or sized.
      * View the documentation examples to learn more.
      */
-    fixed_rows: PropTypes.oneOfType([
-        PropTypes.exact({
-            /**
-             * Example `{'headers':False, 'data':0}` No rows are fixed (the default)
-             */
-
-            data: PropTypes.oneOf([0]),
-            headers: PropTypes.oneOf([false])
-        }),
-        PropTypes.exact({
-            /**
-             * Example `{'headers':True, 'data':1}` one row is fixed.
-             */
+    fixed_rows: PropTypes.exact({
+        /**
+         * Example `{'headers':False, 'data':0}` No rows are fixed (the default)
+         */
 
-            data: PropTypes.number,
-            headers: PropTypes.oneOf([true]).isRequired
-        })
-    ]),
+        data: PropTypes.number,
+        headers: PropTypes.bool
+    }),
 
     /**
      * If `single`, then the user can select a single column or group

dash/_callback.py

@@ -365,7 +365,9 @@ def register_callback(
     # pylint: disable=too-many-locals
     def wrap_func(func):
 
-        if background is not None:
+        if background is None:
+            background_key = None
+        else:
             background_key = BaseBackgroundCallbackManager.register_func(
                 func,
                 background.get("progress") is not None,
@@ -520,7 +522,7 @@ def add_context(*args, **kwargs):
                     return to_json(response)
             else:
                 try:
-                    output_value = _invoke_callback(func, *func_args, **func_kwargs)
+                    output_value = _invoke_callback(func, *func_args, **func_kwargs)  # type: ignore[reportArgumentType]
                 except PreventUpdate as err:
                     raise err
                 except Exception as err:  # pylint: disable=broad-exception-caught
@@ -560,7 +562,7 @@ def add_context(*args, **kwargs):
                     if NoUpdate.is_no_update(val):
                         continue
                     for vali, speci in (
-                        zip(val, spec) if isinstance(spec, list) else [[val, spec]]
+                        zip(val, spec) if isinstance(spec, list) else [[val, spec]]  # type: ignore[reportArgumentType]]
                     ):
                         if not NoUpdate.is_no_update(vali):
                             has_update = True
@@ -595,6 +597,7 @@ def add_context(*args, **kwargs):
                 dist = app.get_dist(diff_packages)
                 response["dist"] = dist
 
+            jsonResponse = None
             try:
                 jsonResponse = to_json(response)
             except TypeError:

dash/_callback_context.py

@@ -207,15 +207,15 @@ def response(self):
 
     @staticmethod
     @has_context
-    def record_timing(name, duration=None, description=None):
+    def record_timing(name, duration, description=None):
         """Records timing information for a server resource.
 
         :param name: The name of the resource.
         :type name: string
 
         :param duration: The time in seconds to report. Internally, this
             is rounded to the nearest millisecond.
-        :type duration: float or None
+        :type duration: float
 
         :param description: A description of the resource.
         :type description: string or None

dash/_grouping.py

@@ -13,7 +13,7 @@
 structure
 
 """
-from dash.exceptions import InvalidCallbackReturnValue
+from .exceptions import InvalidCallbackReturnValue
 from ._utils import AttributeDict, stringify_id
 
 

dash/_hooks.py

@@ -61,8 +61,8 @@ def add_hook(
         hook: str,
         func: _t.Callable,
         priority: _t.Optional[int] = None,
-        final=False,
-        data=None,
+        final: bool = False,
+        data: _t.Optional[HookDataType] = None,
     ):
         if final:
             existing = self._finals.get(hook)
@@ -117,7 +117,7 @@ def route(
         name: _t.Optional[str] = None,
         methods: _t.Sequence[str] = ("GET",),
         priority: _t.Optional[int] = None,
-        final=False,
+        final: bool = False,
     ):
         """
         Add a route to the Dash server.
@@ -136,7 +136,7 @@ def wrap(func: _t.Callable[[], _f.Response]):
 
         return wrap
 
-    def error(self, priority: _t.Optional[int] = None, final=False):
+    def error(self, priority: _t.Optional[int] = None, final: bool = False):
         """Automatically add an error handler to the dash app."""
 
         def _error(func: _t.Callable[[Exception], _t.Any]):
@@ -145,7 +145,9 @@ def _error(func: _t.Callable[[Exception], _t.Any]):
 
         return _error
 
-    def callback(self, *args, priority: _t.Optional[int] = None, final=False, **kwargs):
+    def callback(
+        self, *args, priority: _t.Optional[int] = None, final: bool = False, **kwargs
+    ):
         """
         Add a callback to all the apps with the hook installed.
         """

dash/_jupyter.py

@@ -1,3 +1,4 @@
+# type: ignore
 import asyncio
 import io
 import inspect

dash/_pages.py

@@ -1,5 +1,6 @@
 import collections
 import importlib
+import importlib.util  # to make the type checker happy
 import os
 import re
 import sys
@@ -85,9 +86,11 @@ def _infer_path(module_name, template):
 
 
 def _module_name_is_package(module_name):
+    file_path = sys.modules[module_name].__file__
     return (
-        module_name in sys.modules
-        and Path(sys.modules[module_name].__file__).name == "__init__.py"
+        file_path
+        and module_name in sys.modules
+        and Path(file_path).name == "__init__.py"
     )
 
 
@@ -441,8 +444,8 @@ def _import_layouts_from_pages(pages_folder):
 
             module_name = _infer_module_name(page_path)
             spec = importlib.util.spec_from_file_location(module_name, page_path)
-            page_module = importlib.util.module_from_spec(spec)
-            spec.loader.exec_module(page_module)
+            page_module = importlib.util.module_from_spec(spec)  # type: ignore[reportArgumentType]
+            spec.loader.exec_module(page_module)  # type: ignore[reportOptionalMemberAccess]
             sys.modules[module_name] = page_module
 
             if (

dash/_patch.py

@@ -1,11 +1,16 @@
+from typing import List, Union, Optional, Any
+
+
 def _operation(name, location, **kwargs):
     return {"operation": name, "location": location, "params": dict(**kwargs)}
 
 
 _noop = object()
 
+_KeyType = Union[str, int]
+
 
-def validate_slice(obj):
+def validate_slice(obj: Any):
     if isinstance(obj, slice):
         raise TypeError("a slice is not a valid index for patch")
 
@@ -19,7 +24,11 @@ class Patch:
     Supported prop types: Dictionaries and lists.
     """
 
-    def __init__(self, location=None, parent=None):
+    def __init__(
+        self,
+        location: Optional[List[_KeyType]] = None,
+        parent: Optional["Patch"] = None,
+    ):
         if location is not None:
             self._location = location
         else:
@@ -36,11 +45,11 @@ def __getstate__(self):
     def __setstate__(self, state):
         vars(self).update(state)
 
-    def __getitem__(self, item) -> "Patch":
+    def __getitem__(self, item: _KeyType) -> "Patch":
         validate_slice(item)
         return Patch(location=self._location + [item], parent=self)
 
-    def __getattr__(self, item) -> "Patch":
+    def __getattr__(self, item: _KeyType) -> "Patch":
         if item == "tolist":
             # to_json fix
             raise AttributeError
@@ -50,16 +59,16 @@ def __getattr__(self, item) -> "Patch":
             return self._operations  # type: ignore
         return self.__getitem__(item)
 
-    def __setattr__(self, key, value):
+    def __setattr__(self, key: _KeyType, value: Any):
         if key in ("_location", "_operations"):
             self.__dict__[key] = value
         else:
             self.__setitem__(key, value)
 
-    def __delattr__(self, item):
+    def __delattr__(self, item: _KeyType):
         self.__delitem__(item)
 
-    def __setitem__(self, key, value):
+    def __setitem__(self, key: _KeyType, value: Any):
         validate_slice(key)
         if value is _noop:
             # The += set themselves.
@@ -72,11 +81,11 @@ def __setitem__(self, key, value):
             )
         )
 
-    def __delitem__(self, key):
+    def __delitem__(self, key: _KeyType):
         validate_slice(key)
         self._operations.append(_operation("Delete", self._location + [key]))
 
-    def __iadd__(self, other):
+    def __iadd__(self, other: Any):
         if isinstance(other, (list, tuple)):
             self.extend(other)
         else:
@@ -85,25 +94,25 @@ def __iadd__(self, other):
             return self
         return _noop
 
-    def __isub__(self, other):
+    def __isub__(self, other: Any):
         self._operations.append(_operation("Sub", self._location, value=other))
         if not self._location:
             return self
         return _noop
 
-    def __imul__(self, other):
+    def __imul__(self, other: Any) -> "Patch":
         self._operations.append(_operation("Mul", self._location, value=other))
         if not self._location:
             return self
         return _noop
 
-    def __itruediv__(self, other):
+    def __itruediv__(self, other: Any):
         self._operations.append(_operation("Div", self._location, value=other))
         if not self._location:
             return self
         return _noop
 
-    def __ior__(self, other):
+    def __ior__(self, other: Any):
         self.update(E=other)
         if not self._location:
             return self
@@ -115,39 +124,39 @@ def __iter__(self):
     def __repr__(self):
         return f"<write-only dash.Patch object at {self._location}>"
 
-    def append(self, item):
+    def append(self, item: Any) -> None:
         """Add the item to the end of a list"""
         self._operations.append(_operation("Append", self._location, value=item))
 
-    def prepend(self, item):
+    def prepend(self, item: Any) -> None:
         """Add the item to the start of a list"""
         self._operations.append(_operation("Prepend", self._location, value=item))
 
-    def insert(self, index, item):
+    def insert(self, index: int, item: Any) -> None:
         """Add the item at the index of a list"""
         self._operations.append(
             _operation("Insert", self._location, value=item, index=index)
         )
 
-    def clear(self):
+    def clear(self) -> None:
         """Remove all items in a list"""
         self._operations.append(_operation("Clear", self._location))
 
-    def reverse(self):
+    def reverse(self) -> None:
         """Reversal of the order of items in a list"""
         self._operations.append(_operation("Reverse", self._location))
 
-    def extend(self, item):
+    def extend(self, item: Union[list, tuple]) -> None:
         """Add all the items to the end of a list"""
         if not isinstance(item, (list, tuple)):
             raise TypeError(f"{item} should be a list or tuple")
         self._operations.append(_operation("Extend", self._location, value=item))
 
-    def remove(self, item):
+    def remove(self, item: Any) -> None:
         """filter the item out of a list on the frontend"""
         self._operations.append(_operation("Remove", self._location, value=item))
 
-    def update(self, E=None, **F):
+    def update(self, E: Any = None, **F) -> None:
         """Merge a dict or keyword arguments with another dictionary"""
         value = E or {}
         value.update(F)
@@ -159,7 +168,7 @@ def sort(self):
             "sort is reserved for future use, use brackets to access this key on your object"
         )
 
-    def to_plotly_json(self):
+    def to_plotly_json(self) -> Any:
         return {
             "__dash_patch_update": "__dash_patch_update",
             "operations": self._operations,