With the previous release, dispatched actions are set through the entire stack of middleware.

const actionCreator = () => ({
  type: 'EXAMPLE_TYPE',
  payload: {
    promise: Promise.resolve({
      type: 'RESOLVED_ACTION' 
      payload: ...
    })
   }
});

However, this middleware does not check to see if the resolved or rejected parameter is a function. This release adds a check for thunk /function before resolving or rejecting as payload.

For example, now the following will also work:

const actionCreator = () => ({
  type: 'EXAMPLE_TYPE',
  payload: {
    promise: Promise.resolve((dispatch, getState) => {
      dispatch({ type: 'RESOLVED_ACTION', payload: '' })
      dispatch(someActionCreatorThatMaybeUpdatesTheRoute())
      doSomethingNaughtyAfterDispatchingEverything(getState())
    })
   }
});

This is not a breaking change.