Function promise

test/typescript/middleware.ts:41–55

()

type PromiseDispatch = <T extends Action>(promise: Promise<T>) => Promise<T>

function promise() {
  const promiseMiddleware: Middleware<PromiseDispatch> =
    ({ dispatch }) =>
    next =>
    action => {
      if (action instanceof Promise) {
        action.then(dispatch)
        return action
      }

      return next(action)
    }

  return promiseMiddleware
}

/**
 * Thunk middleware adds support for dispatching thunks.