From 6539503c09880ce039c5a5112efd6d361aeb449d Mon Sep 17 00:00:00 2001
From: Mark Erikson <mark@isquaredsoftware.com>
Date: Sun, 1 Oct 2023 14:59:04 -0400
Subject: [PATCH 1/2] Add phryneas/ts-version

---
 packages/toolkit/package.json | 1 +
 yarn.lock                     | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/packages/toolkit/package.json b/packages/toolkit/package.json
index 21cd8f046..7b83807e2 100644
--- a/packages/toolkit/package.json
+++ b/packages/toolkit/package.json
@@ -50,6 +50,7 @@
   },
   "devDependencies": {
     "@microsoft/api-extractor": "^7.13.2",
+    "@phryneas/ts-version": "^1.0.2",
     "@size-limit/preset-small-lib": "^4.11.0",
     "@testing-library/react": "^13.3.0",
     "@testing-library/user-event": "^13.1.5",
diff --git a/yarn.lock b/yarn.lock
index cd80d4126..e74fb26bf 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6808,6 +6808,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@phryneas/ts-version@npm:^1.0.2":
+  version: 1.0.2
+  resolution: "@phryneas/ts-version@npm:1.0.2"
+  checksum: d51914a8ea35ff8b686a9379b9e9fe6d5b5feaf2e7511b880d2835015736e33bc82952bbc369918f251d4a755f32f4a9c4a34b0ec4dfdbc3e87a41d26401105c
+  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"
@@ -6981,6 +6988,7 @@ __metadata:
   resolution: "@reduxjs/toolkit@workspace:packages/toolkit"
   dependencies:
     "@microsoft/api-extractor": ^7.13.2
+    "@phryneas/ts-version": ^1.0.2
     "@size-limit/preset-small-lib": ^4.11.0
     "@testing-library/react": ^13.3.0
     "@testing-library/user-event": ^13.1.5

From 083546fcfce66337a65f76315edccfbf31b4c937 Mon Sep 17 00:00:00 2001
From: Mark Erikson <mark@isquaredsoftware.com>
Date: Sun, 1 Oct 2023 15:02:43 -0400
Subject: [PATCH 2/2] Work around known TS bug with type inference

---
 .../src/tests/createAsyncThunk.typetest.ts    | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/packages/toolkit/src/tests/createAsyncThunk.typetest.ts b/packages/toolkit/src/tests/createAsyncThunk.typetest.ts
index e5e90a8e4..05cf4fd60 100644
--- a/packages/toolkit/src/tests/createAsyncThunk.typetest.ts
+++ b/packages/toolkit/src/tests/createAsyncThunk.typetest.ts
@@ -21,6 +21,7 @@ import type {
   AsyncThunkFulfilledActionCreator,
   AsyncThunkRejectedActionCreator,
 } from '@internal/createAsyncThunk'
+import type { TSVersion } from '@phryneas/ts-version'
 
 const ANY = {} as any
 const defaultDispatch = (() => {}) as ThunkDispatch<{}, any, UnknownAction>
@@ -291,8 +292,22 @@ const unknownAction = { type: 'foo' } as UnknownAction
   // in that case, we have to forbid this behaviour or it will make arguments optional everywhere
   {
     const asyncThunk = createAsyncThunk('test', (arg?: number) => 0)
-    expectType<(arg?: number) => any>(asyncThunk)
-    asyncThunk()
+
+    // Per https://github.com/reduxjs/redux-toolkit/issues/3758#issuecomment-1742152774 , this is a bug in
+    // TS 5.1 and 5.2, that is fixed in 5.3. Conditionally run the TS assertion here.
+    type IsTS51Or52 = TSVersion.Major extends 5
+      ? TSVersion.Minor extends 1 | 2
+        ? true
+        : false
+      : false
+
+    type expectedType = IsTS51Or52 extends true
+      ? (arg: number) => any
+      : (arg?: number) => any
+    expectType<expectedType>(asyncThunk)
+    // We _should_ be able to call this with no arguments, but we run into that error in 5.1 and 5.2.
+    // Disabling this for now.
+    // asyncThunk()
     asyncThunk(5)
     // @ts-expect-error
     asyncThunk('string')