apply changed type only for TS versions >= 4.8

Author: phryneas

packages/toolkit/package.json

@@ -97,6 +97,7 @@
     "query"
   ],
   "dependencies": {
+    "@phryneas/ts-version": "^1.0.1",
     "immer": "^9.0.7",
     "redux": "^4.1.2",
     "redux-thunk": "^2.4.1",

packages/toolkit/src/createSlice.ts

@@ -235,7 +235,9 @@ export type ValidateSliceCaseReducers<
       ? {
           prepare(...a: never[]): Omit<A, 'type'>
         }
-      : ACR[T]
+      : import('@phryneas/ts-version').TSVersion.AtLeast<'4', '8'> extends true
+      ? ACR[T]
+      : {}
   }
 
 function getType(slice: string, actionKey: string): string {

yarn.lock

@@ -5484,6 +5484,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@phryneas/ts-version@npm:^1.0.1":
+  version: 1.0.1
+  resolution: "@phryneas/ts-version@npm:1.0.1"
+  checksum: 897ee7a6c673fa48847518913418a51d96bf3a72092c4e1bbf3e8e715abe781ac17479e346e872a55ce7a48b70df88729056955f800a60259381d08d20563ec7
+  languageName: node
+  linkType: hard
+
 "@pmmmwh/react-refresh-webpack-plugin@npm:^0.5.3":
   version: 0.5.7
   resolution: "@pmmmwh/react-refresh-webpack-plugin@npm:0.5.7"
@@ -5596,6 +5603,7 @@ __metadata:
   resolution: "@reduxjs/toolkit@workspace:packages/toolkit"
   dependencies:
     "@microsoft/api-extractor": ^7.13.2
+    "@phryneas/ts-version": ^1.0.1
     "@size-limit/preset-small-lib": ^4.11.0
     "@testing-library/react": ^13.3.0
     "@testing-library/user-event": ^13.1.5