john-bodley commented on a change in pull request #9824:
URL: 
https://github.com/apache/incubator-superset/pull/9824#discussion_r430038941



##########
File path: superset/typing.py
##########
@@ -16,15 +16,31 @@
 # under the License.
 from typing import Any, Callable, Dict, List, Optional, Tuple, Union
 
-from flask import Flask
+import flask
+import werkzeug
 from flask_caching import Cache
 
-CacheConfig = Union[Callable[[Flask], Cache], Dict[str, Any]]
+CacheConfig = Union[Callable[[flask.Flask], Cache], Dict[str, Any]]
 DbapiDescriptionRow = Tuple[
     str, str, Optional[str], Optional[str], Optional[int], Optional[int], bool
 ]
 DbapiDescription = Union[List[DbapiDescriptionRow], Tuple[DbapiDescriptionRow, 
...]]
 DbapiResult = List[Union[List[Any], Tuple[Any, ...]]]
 FilterValue = Union[float, int, str]
 FilterValues = Union[FilterValue, List[FilterValue], Tuple[FilterValue]]
+Granularity = Union[str, Dict[str, Union[str, float]]]
+Metric = Union[Dict[str, str], str]
+QueryObjectDict = Dict[str, Any]
 VizData = Optional[Union[List[Any], Dict[Any, Any]]]
+
+# Flask response.
+Base = Union[bytes, str]
+Status = Union[int, str]
+Headers = Dict[str, Any]
+FlaskResponse = Union[
+    flask.wrappers.Response,
+    werkzeug.wrappers.Response,
+    Base,
+    Union[Base, Status],
+    Union[Base, Status, Headers],
+]

Review comment:
       @villebro, that's actually a typo as the later `Union` should be a 
`Tuple` and given that `flask.wrappers.Response` is derived from 
`werkzeug.wrappers.Response` per 
[here](https://github.com/pallets/flask/blob/master/src/flask/wrappers.py#L93) 
this could be:
   
   ```python
   FlaskResponse = Union[
       werkzeug.wrappers.Response,
       Base,
       Tuple[Base, Status],
       Tuple[Base, Status, Headers],
   ]
   ```
   

##########
File path: superset/typing.py
##########
@@ -16,15 +16,31 @@
 # under the License.
 from typing import Any, Callable, Dict, List, Optional, Tuple, Union
 
-from flask import Flask
+import flask
+import werkzeug
 from flask_caching import Cache
 
-CacheConfig = Union[Callable[[Flask], Cache], Dict[str, Any]]
+CacheConfig = Union[Callable[[flask.Flask], Cache], Dict[str, Any]]
 DbapiDescriptionRow = Tuple[
     str, str, Optional[str], Optional[str], Optional[int], Optional[int], bool
 ]
 DbapiDescription = Union[List[DbapiDescriptionRow], Tuple[DbapiDescriptionRow, 
...]]
 DbapiResult = List[Union[List[Any], Tuple[Any, ...]]]
 FilterValue = Union[float, int, str]
 FilterValues = Union[FilterValue, List[FilterValue], Tuple[FilterValue]]
+Granularity = Union[str, Dict[str, Union[str, float]]]
+Metric = Union[Dict[str, str], str]
+QueryObjectDict = Dict[str, Any]
 VizData = Optional[Union[List[Any], Dict[Any, Any]]]
+
+# Flask response.
+Base = Union[bytes, str]
+Status = Union[int, str]
+Headers = Dict[str, Any]
+FlaskResponse = Union[
+    flask.wrappers.Response,
+    werkzeug.wrappers.Response,
+    Base,
+    Union[Base, Status],
+    Union[Base, Status, Headers],
+]

Review comment:
       @villebro, that's actually a typo as the later `Union` should be a 
`Tuple`. Also given that `flask.wrappers.Response` is derived from 
`werkzeug.wrappers.Response` per 
[here](https://github.com/pallets/flask/blob/master/src/flask/wrappers.py#L93) 
this could be:
   
   ```python
   FlaskResponse = Union[
       werkzeug.wrappers.Response,
       Base,
       Tuple[Base, Status],
       Tuple[Base, Status, Headers],
   ]
   ```
   




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