Add stubs for RethinkDB

.builds/lint.yml

@@ -1,4 +1,4 @@
-image: debian/stable
+image: debian/buster
 packages:
   - tox
 sources:

mypy.ini

@@ -1,6 +1,7 @@
 [mypy]
-files = src/*.pyi
+files = stubs/**.pyi
 warn_unused_configs = true
+warn_unreachable = true
 disallow_untyped_calls = true
 disallow_untyped_defs = true
 disallow_incomplete_defs = true

stubs/rethinkdb/__init__.pyi

@@ -0,0 +1,10 @@
+from typing import Optional, Type
+
+from .trio_net.net_trio import TrioConnectionPool
+
+class RethinkDB:
+    ConnectionPool: Type[TrioConnectionPool]
+    def __init__(self) -> None: ...
+    def set_loop_type(self, library: Optional[str]) -> None: ...
+
+r: RethinkDB

stubs/rethinkdb/trio_net/net_trio.pyi

@@ -0,0 +1,5 @@
+from typing import Any
+
+class TrioConnectionPool:
+    def __init__(self, *args: Any, **kwargs: Any) -> None: ...
+    async def close(self) -> None: ...

tox.ini

@@ -17,7 +17,7 @@ deps =
     mypy >= 0.790
     pytest-trio
     trio-typing
-commands = mypy src/acanban tests
+commands = mypy src stubs tests
 
 [testenv:style]
 skip_install = true