call enableES5 from createReducer

Author: phryneas

src/createReducer.ts

@@ -1,5 +1,5 @@
 import type { Draft } from 'immer'
-import createNextState, { isDraft, isDraftable } from 'immer'
+import createNextState, { isDraft, isDraftable, enableES5 } from 'immer'
 import type { AnyAction, Action, Reducer } from 'redux'
 import type { ActionReducerMapBuilder } from './mapBuilders'
 import { executeReducerBuilderCallback } from './mapBuilders'
@@ -193,6 +193,12 @@ export function createReducer<S>(
   actionMatchers: ActionMatcherDescriptionCollection<S> = [],
   defaultCaseReducer?: CaseReducer<S>
 ): Reducer<S> {
+  // We deliberately enable Immer's ES5 support, on the grounds that
+  // we assume RTK will be used with React Native and other Proxy-less
+  // environments.  In addition, that's how Immer 4 behaved, and since
+  // we want to ship this in an RTK minor, we should keep the same behavior.
+  enableES5()
+
   let [actionsMap, finalActionMatchers, finalDefaultCaseReducer] =
     typeof mapOrBuilderCallback === 'function'
       ? executeReducerBuilderCallback(mapOrBuilderCallback)

src/index.ts

@@ -1,4 +1,3 @@
-import { enableES5 } from 'immer'
 export * from 'redux'
 export {
   default as createNextState,
@@ -18,12 +17,6 @@ export type {
 export { createDraftSafeSelector } from './createDraftSafeSelector'
 export type { ThunkAction, ThunkDispatch } from 'redux-thunk'
 
-// We deliberately enable Immer's ES5 support, on the grounds that
-// we assume RTK will be used with React Native and other Proxy-less
-// environments.  In addition, that's how Immer 4 behaved, and since
-// we want to ship this in an RTK minor, we should keep the same behavior.
-enableES5()
-
 export {
   // js
   configureStore,