Create a version of `handleActions` which supports async actions too about redux-actions HOT 3 OPEN

const handler = (state, action) => newState

const reducer = createReducer()
  .when([ACTION_FOO, ACTION_BAR], handlerForBothActions) // share handler for multi actions
  .when('BAZ', handler)    // optimistic update here if you need
  .done(handler)               // handle 'BAZ_COMPLETED'
  .failed(errorHandler)      // handle 'BAZ_FAILED'
  .build(initValue);