OmegaConf library passes strict mypy tests

.coveragerc

@@ -4,15 +4,15 @@ omit =
     *tests*
     docs/*
     omegaconf/version.py
+    .stubs
 
 [report]
-# Don't complain if tests don't hit defensive assertion code:
 exclude_lines =
     pragma: no cover
     raise AssertionError
     raise NotImplementedError
-    return NotImplemented
     raise TypeError
+    return NotImplemented
     assert False
     @abstractmethod
 

.gitignore

@@ -16,3 +16,5 @@ TODO
 .eggs
 .mypy_cache
 /pip-wheel-metadata
+/.pyre
+.dmypy.json

.pyre_configuration

@@ -0,0 +1,18 @@
+{
+  "source_directories": [
+    "."
+  ],
+  "search_path": [
+    ".stubs"
+  ],
+  "exclude": [
+    ".*\\.nox/.*",
+    ".*build/.*"
+  ],
+  "ignore_all_errors": [
+    "docs",
+    ".eggs",
+    "noxfile.py",
+    "setup.py"
+  ]
+}

.stubs/nox.pyi

@@ -0,0 +1 @@
+def __getattr__(name): ...  # type: ignore

.stubs/pytest.pyi

@@ -0,0 +1 @@
+def __getattr__(name): ...  # type: ignore

.stubs/setuptools.pyi

@@ -0,0 +1 @@
+def __getattr__(name): ...  # type: ignore

.stubs/yaml.pyi

@@ -0,0 +1 @@
+def __getattr__(name): ...  # type: ignore

noxfile.py

@@ -1,3 +1,4 @@
+# type: ignore
 import nox
 import os
 
@@ -51,6 +52,9 @@ def lint(session):
     # if this fails you need to format your code with black
     session.run("black", "--check", ".")
 
+    session.run("mypy", "tests")
+    session.run("mypy", "omegaconf", "--strict")
+
 
 @nox.session(python=PYTHON_VERSIONS)
 def test_jupyter_notebook(session):

omegaconf/__init__.py

@@ -1,4 +1,4 @@
-from .container import Container
+from .basecontainer import BaseContainer
 from .dictconfig import DictConfig
 from .errors import (
     MissingMandatoryValue,
@@ -8,6 +8,7 @@
     UnsupportedValueType,
 )
 from .listconfig import ListConfig
+from .base import Node
 from .nodes import (
     ValueNode,
     BooleanNode,
@@ -27,13 +28,14 @@
     "ReadonlyConfigError",
     "UnsupportedValueType",
     "UnsupportedKeyType",
-    "Container",
+    "BaseContainer",
     "ListConfig",
     "DictConfig",
     "OmegaConf",
     "flag_override",
     "read_write",
     "open_dict",
+    "Node",
     "ValueNode",
     "AnyNode",
     "IntegerNode",