Fix chat action creators in UsageWithTypescript (#3395)
Fix chat action creators in UsageWithTypescript (#3395)

The comments in the chat action creators imply that `TypeScript infers that this function is returning DeleteMessageAction`, while the returned union type is not defined.

If the return type is not manually linked to the Union Type, I have no idea how the inference based on just the constant should work.
gaearon/redux,gaearon/redux