Function createStore

src/createStore.ts:87–396

(
  reducer: Reducer<S, A, PreloadedState>,
  preloadedState?: PreloadedState | StoreEnhancer<Ext, StateExt> | undefined,
  enhancer?: StoreEnhancer<Ext, StateExt>
)

  enhancer?: StoreEnhancer<Ext, StateExt>
): Store<S, A, UnknownIfNonSpecific<StateExt>> & Ext
export function createStore<
  S,
  A extends Action,
  Ext extends {} = {},
  StateExt extends {} = {},
  PreloadedState = S
>(
  reducer: Reducer<S, A, PreloadedState>,
  preloadedState?: PreloadedState | StoreEnhancer<Ext, StateExt> | undefined,
  enhancer?: StoreEnhancer<Ext, StateExt>
): Store<S, A, UnknownIfNonSpecific<StateExt>> & Ext {
  if (typeof reducer !== class="st">'function') {
    throw new Error(
      `Expected the root reducer to be a function. Instead, received: '${kindOf(
        reducer
      )}'`
    )
  }

  if (
    (typeof preloadedState === class="st">'function' && typeof enhancer === class="st">'function') ||
    (typeof enhancer === class="st">'function' && typeof arguments[3] === class="st">'function')
  ) {
    throw new Error(
      class="st">'It looks like you are passing several store enhancers to ' +
        class="st">'createStore(). This is not supported. Instead, compose them ' +
        class="st">'together to a single function. See https:class="cm">//redux.js.org/tutorials/fundamentals/part-4-store#creating-a-store-with-enhancers for an example.'
    )
  }

  if (typeof preloadedState === class="st">'function' && typeof enhancer === class="st">'undefined') {
    enhancer = preloadedState as StoreEnhancer<Ext, StateExt>
    preloadedState = undefined
  }

  if (typeof enhancer !== class="st">'undefined') {
    if (typeof enhancer !== class="st">'function') {
      throw new Error(
        `Expected the enhancer to be a function. Instead, received: '${kindOf(
          enhancer
        )}'`
      )
    }

    return enhancer(createStore)(
      reducer,
      preloadedState as PreloadedState | undefined
    )
  }

  let currentReducer = reducer
  let currentState: S | PreloadedState | undefined = preloadedState as
    | PreloadedState
    | undefined
  let currentListeners: Map<number, ListenerCallback> | null = new Map()
  let nextListeners = currentListeners
  let listenerIdCounter = 0
  let isDispatching = false