Function applyMiddleware

src/applyMiddleware.ts:53–77

(
  ...middlewares: Middleware[]
)

  ...middlewares: Middleware<any, S, any>[]
): StoreEnhancer<{ dispatch: Ext }>
export default function applyMiddleware(
  ...middlewares: Middleware[]
): StoreEnhancer<any> {
  return createStore => (reducer, preloadedState) => {
    const store = createStore(reducer, preloadedState)
    let dispatch: Dispatch = () => {
      throw new Error(
        'Dispatching while constructing your middleware is not allowed. ' +
          'Other middleware would not be applied to this dispatch.'
      )
    }

    const middlewareAPI: MiddlewareAPI = {
      getState: store.getState,
      dispatch: (action, ...args) => dispatch(action, ...args)
    }
    const chain = middlewares.map(middleware => middleware(middlewareAPI))
    dispatch = compose<typeof dispatch>(...chain)(store.dispatch)

    return {
      ...store,
      dispatch
    }
  }
}