Add stricter mypy type check flags

.travis.yml

@@ -9,7 +9,7 @@ install:
 script:
 - pytest --cov=dacite
 - black --check .
-- mypy dacite
+- mypy
 - pylint dacite
 after_success:
   coveralls

dacite/__init__.py

@@ -1,3 +1,23 @@
 from dacite.config import Config
 from dacite.core import from_dict
-from dacite.exceptions import *
+from dacite.exceptions import (
+    DaciteError,
+    DaciteFieldError,
+    WrongTypeError,
+    MissingValueError,
+    UnionMatchError,
+    ForwardReferenceError,
+    UnexpectedDataError,
+)
+
+__all__ = (
+    "Config",
+    "from_dict",
+    "DaciteError",
+    "DaciteFieldError",
+    "WrongTypeError",
+    "MissingValueError",
+    "UnionMatchError",
+    "ForwardReferenceError",
+    "UnexpectedDataError",
+)

dacite/dataclasses.py

@@ -22,7 +22,7 @@ def get_default_value_for_field(field: Field) -> Any:
 
 
 def create_instance(data_class: Type[T], init_values: Data, post_init_values: Data) -> T:
-    instance = data_class(**init_values)
+    instance: T = data_class(**init_values)
     for key, value in post_init_values.items():
         setattr(instance, key, value)
     return instance

dacite/types.py

@@ -125,7 +125,7 @@ def is_generic_collection(type_: Type) -> bool:
 
 
 def extract_generic(type_: Type) -> tuple:
-    return type_.__args__  # type: ignore
+    return type_.__args__
 
 
 def is_subclass(sub_type: Type, base_type: Type) -> bool:

setup.cfg

@@ -0,0 +1,22 @@
+[mypy]
+python_version = 3.6
+files = dacite
+show_error_codes = True
+pretty = True
+
+no_implicit_reexport = True
+no_implicit_optional = True
+strict_equality = True
+strict_optional = True
+check_untyped_defs = True
+disallow_incomplete_defs = True
+ignore_missing_imports = False
+
+warn_unused_configs = True
+warn_redundant_casts = True
+warn_unused_ignores = True
+warn_return_any = True
+warn_unreachable = True
+
+[mypy-dacite.types]
+warn_return_any = False