Port createStore deprecation from 4.x branch

src/createStore.ts

@@ -15,55 +15,65 @@ import isPlainObject from './utils/isPlainObject'
 import { kindOf } from './utils/kindOf'
 
 /**
- * Creates a Redux store that holds the state tree.
- * The only way to change the data in the store is to call `dispatch()` on it.
+ * @deprecated
  *
- * There should only be a single store in your app. To specify how different
- * parts of the state tree respond to actions, you may combine several reducers
- * into a single reducer function by using `combineReducers`.
+ * **We recommend using the `configureStore` method
+ * of the `@reduxjs/toolkit` package**, which replaces `createStore`.
  *
- * @param reducer A function that returns the next state tree, given
- * the current state tree and the action to handle.
+ * Redux Toolkit is our recommended approach for writing Redux logic today,
+ * including store setup, reducers, data fetching, and more.
  *
- * @param preloadedState The initial state. You may optionally specify it
- * to hydrate the state from the server in universal apps, or to restore a
- * previously serialized user session.
- * If you use `combineReducers` to produce the root reducer function, this must be
- * an object with the same shape as `combineReducers` keys.
+ * **For more details, please read this Redux docs page:**
+ * **https://redux.js.org/introduction/why-rtk-is-redux-today**
  *
- * @param enhancer The store enhancer. You may optionally specify it
- * to enhance the store with third-party capabilities such as middleware,
- * time travel, persistence, etc. The only store enhancer that ships with Redux
- * is `applyMiddleware()`.
+ * `configureStore` from Redux Toolkit is an improved version of `createStore` that
+ * simplifies setup and helps avoid common bugs.
+ *
+ * You should not be using the `redux` core package by itself today, except for learning purposes.
+ * The `createStore` method from the core `redux` package will not be removed, but we encourage
+ * all users to migrate to using Redux Toolkit for all Redux code.
+ *
+ * If you want to use `createStore` without this visual deprecation warning, use
+ * the `legacy_createStore` import instead:
+ *
+ * `import { legacy_createStore as createStore} from 'redux'`
  *
- * @returns A Redux store that lets you read the state, dispatch actions
- * and subscribe to changes.
  */
-export default function createStore<
-  S,
-  A extends Action,
-  Ext = {},
-  StateExt = never
->(
+export function createStore<S, A extends Action, Ext = {}, StateExt = never>(
   reducer: Reducer<S, A>,
   enhancer?: StoreEnhancer<Ext, StateExt>
 ): Store<ExtendState<S, StateExt>, A, StateExt, Ext> & Ext
-export default function createStore<
-  S,
-  A extends Action,
-  Ext = {},
-  StateExt = never
->(
+/**
+ * @deprecated
+ *
+ * **We recommend using the `configureStore` method
+ * of the `@reduxjs/toolkit` package**, which replaces `createStore`.
+ *
+ * Redux Toolkit is our recommended approach for writing Redux logic today,
+ * including store setup, reducers, data fetching, and more.
+ *
+ * **For more details, please read this Redux docs page:**
+ * **https://redux.js.org/introduction/why-rtk-is-redux-today**
+ *
+ * `configureStore` from Redux Toolkit is an improved version of `createStore` that
+ * simplifies setup and helps avoid common bugs.
+ *
+ * You should not be using the `redux` core package by itself today, except for learning purposes.
+ * The `createStore` method from the core `redux` package will not be removed, but we encourage
+ * all users to migrate to using Redux Toolkit for all Redux code.
+ *
+ * If you want to use `createStore` without this visual deprecation warning, use
+ * the `legacy_createStore` import instead:
+ *
+ * `import { legacy_createStore as createStore} from 'redux'`
+ *
+ */
+export function createStore<S, A extends Action, Ext = {}, StateExt = never>(
   reducer: Reducer<S, A>,
   preloadedState?: PreloadedState<S>,
   enhancer?: StoreEnhancer<Ext, StateExt>
 ): Store<ExtendState<S, StateExt>, A, StateExt, Ext> & Ext
-export default function createStore<
-  S,
-  A extends Action,
-  Ext = {},
-  StateExt = never
->(
+export function createStore<S, A extends Action, Ext = {}, StateExt = never>(
   reducer: Reducer<S, A>,
   preloadedState?: PreloadedState<S> | StoreEnhancer<Ext, StateExt>,
   enhancer?: StoreEnhancer<Ext, StateExt>
@@ -367,3 +377,95 @@ export default function createStore<
   } as unknown as Store<ExtendState<S, StateExt>, A, StateExt, Ext> & Ext
   return store
 }
+
+/**
+ * Creates a Redux store that holds the state tree.
+ *
+ * **We recommend using `configureStore` from the
+ * `@reduxjs/toolkit` package**, which replaces `createStore`:
+ * **https://redux.js.org/introduction/why-rtk-is-redux-today**
+ *
+ * The only way to change the data in the store is to call `dispatch()` on it.
+ *
+ * There should only be a single store in your app. To specify how different
+ * parts of the state tree respond to actions, you may combine several reducers
+ * into a single reducer function by using `combineReducers`.
+ *
+ * @param {Function} reducer A function that returns the next state tree, given
+ * the current state tree and the action to handle.
+ *
+ * @param {any} [preloadedState] The initial state. You may optionally specify it
+ * to hydrate the state from the server in universal apps, or to restore a
+ * previously serialized user session.
+ * If you use `combineReducers` to produce the root reducer function, this must be
+ * an object with the same shape as `combineReducers` keys.
+ *
+ * @param {Function} [enhancer] The store enhancer. You may optionally specify it
+ * to enhance the store with third-party capabilities such as middleware,
+ * time travel, persistence, etc. The only store enhancer that ships with Redux
+ * is `applyMiddleware()`.
+ *
+ * @returns {Store} A Redux store that lets you read the state, dispatch actions
+ * and subscribe to changes.
+ */
+export function legacy_createStore<
+  S,
+  A extends Action,
+  Ext = {},
+  StateExt = never
+>(
+  reducer: Reducer<S, A>,
+  enhancer?: StoreEnhancer<Ext, StateExt>
+): Store<ExtendState<S, StateExt>, A, StateExt, Ext> & Ext
+/**
+ * Creates a Redux store that holds the state tree.
+ *
+ * **We recommend using `configureStore` from the
+ * `@reduxjs/toolkit` package**, which replaces `createStore`:
+ * **https://redux.js.org/introduction/why-rtk-is-redux-today**
+ *
+ * The only way to change the data in the store is to call `dispatch()` on it.
+ *
+ * There should only be a single store in your app. To specify how different
+ * parts of the state tree respond to actions, you may combine several reducers
+ * into a single reducer function by using `combineReducers`.
+ *
+ * @param {Function} reducer A function that returns the next state tree, given
+ * the current state tree and the action to handle.
+ *
+ * @param {any} [preloadedState] The initial state. You may optionally specify it
+ * to hydrate the state from the server in universal apps, or to restore a
+ * previously serialized user session.
+ * If you use `combineReducers` to produce the root reducer function, this must be
+ * an object with the same shape as `combineReducers` keys.
+ *
+ * @param {Function} [enhancer] The store enhancer. You may optionally specify it
+ * to enhance the store with third-party capabilities such as middleware,
+ * time travel, persistence, etc. The only store enhancer that ships with Redux
+ * is `applyMiddleware()`.
+ *
+ * @returns {Store} A Redux store that lets you read the state, dispatch actions
+ * and subscribe to changes.
+ */
+export function legacy_createStore<
+  S,
+  A extends Action,
+  Ext = {},
+  StateExt = never
+>(
+  reducer: Reducer<S, A>,
+  preloadedState?: PreloadedState<S>,
+  enhancer?: StoreEnhancer<Ext, StateExt>
+): Store<ExtendState<S, StateExt>, A, StateExt, Ext> & Ext
+export function legacy_createStore<
+  S,
+  A extends Action,
+  Ext = {},
+  StateExt = never
+>(
+  reducer: Reducer<S, A>,
+  preloadedState?: PreloadedState<S> | StoreEnhancer<Ext, StateExt>,
+  enhancer?: StoreEnhancer<Ext, StateExt>
+): Store<ExtendState<S, StateExt>, A, StateExt, Ext> & Ext {
+  return createStore(reducer, preloadedState as any, enhancer)
+}

src/index.ts

@@ -1,5 +1,5 @@
 // functions
-import createStore from './createStore'
+import { createStore, legacy_createStore } from './createStore'
 import combineReducers from './combineReducers'
 import bindActionCreators from './bindActionCreators'
 import applyMiddleware from './applyMiddleware'
@@ -39,6 +39,7 @@ export { Action, AnyAction } from './types/actions'
 
 export {
   createStore,
+  legacy_createStore,
   combineReducers,
   bindActionCreators,
   applyMiddleware,