Can't use csv.writer with --strict?

When I use `mypy --strict` with a `csv.writer(text_io)`, I get the error `Call to untyped function "writer" in typed context`. I expected that since `csv.writer` is part of the standard library, it would be typed in typeshed, but either it's not typed or I'm misreading:

``` py
def writer(csvfile, dialect=..., **fmtparams): ...
```

Is it possible to work around this error?