Remove unused `# type: ignore`s (#12531)

Over time we've begun to use newer versions of mypy, typeshed, stub
packages---and of course we've improved our own annotations. This makes
some type ignore comments no longer necessary. I have removed them.

There was one exception: a module that imports `select.epoll`. The
ignore is redundant on Linux, but I've kept it ignored for those of us
who work on the source tree using not-Linux. (#11771)

I'm more interested in the config line which enforces this. I want
unused ignores to be reported, because I think it's useful feedback when
annotating to know when you've fixed a problem you had to previously
ignore.

* Installing extras before typechecking

Lacking an easy way to install all extras generically, let's bite the bullet and
make install the hand-maintained `all` extra before typechecking.

Now that https://github.com/matrix-org/backend-meta/pull/6 is merged to
the release/v1 branch.

1 files changed, 2 insertions, 2 deletions

diff --git a/synapse/http/server.py b/synapse/http/server.py
index 31ca841889..b8a7a0f5df 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -295,7 +295,7 @@ class _AsyncResource(resource.Resource, metaclass=abc.ABCMeta):
             if isawaitable(raw_callback_return):
                 callback_return = await raw_callback_return
             else:
-                callback_return = raw_callback_return  # type: ignore
+                callback_return = raw_callback_return
 
             return callback_return
 
@@ -469,7 +469,7 @@ class JsonResource(DirectServeJsonResource):
         if isinstance(raw_callback_return, (defer.Deferred, types.CoroutineType)):
             callback_return = await raw_callback_return
         else:
-            callback_return = raw_callback_return  # type: ignore
+            callback_return = raw_callback_return
 
         return callback_return