Hi, Hope somebody can help with the following query, also raised on spectrum chat channel..... I have written a generic epic that accepts an async action as a parameter, as follows: ``` typescript export const genericHandler = < TRequestType extends string, TSuccessType extends string, TFailType extends string, TModel, >( asyncAction: AsyncActionCreatorBuilder< [TRequestType, RequestPayload], [TSuccessType, SuccessPayload], [TFailType, FailurePayload] >, ) => { const epic: Epic< // Is it possible to automatically generate PayloadAction types here for a generic async action argument? // input action types union | PayloadAction< TRequestType, RequestPayload, > | PayloadAction> | PayloadAction>, // output action types union | PayloadAction< TRequestType, RequestPayload > | PayloadAction> | PayloadAction>, RootState, Services > = (action$, state$, { apiService }) => { // perform middleware handling here ... } ``` The type of the ```aysncAction``` parameter is ```AsyncActionCreatorBuilder```. In the redux-observable Epic<...> generic I manually specify the ```PayloadAction``` types for Input and Output actions in the stream. Is there any way to automatically generate the ```PayloadAction``` types? I have tried using ```ActionType``` but this generates type ``` asyncAction: { request: PayloadActionCreator>; success: PayloadActionCreator>; failure: PayloadActionCreator>; } ``` I think this is because I am passing in the parameter type as an ```AsyncActionCreatorBuilder```. How can I get access to the ```AsyncAction``` interface type so that I can use it as the type for the asyncAction parameter instead of using AsyncActionCreatorBuilder? Alternatively, is there a way to automatically generate the union of PayloadAction types from the AsyncActionCreatorBuilder?

Query: Is there a way to access the AsyncAction interface for use as type of a function parameter? #211

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