revive slice thunk idea

Author: ben.durrant

packages/toolkit/src/createAction.ts

@@ -50,6 +50,26 @@ export type PrepareAction<P> =
   | ((...args: any[]) => { payload: P; error: any })
   | ((...args: any[]) => { payload: P; meta: any; error: any })
 
+export type _PayloadActionForPrepare<
+  PA extends PrepareAction<any>,
+  T extends string = string
+> = PA extends PrepareAction<infer P>
+  ? PayloadAction<
+      P,
+      T,
+      ReturnType<PA> extends {
+        meta: infer M
+      }
+        ? M
+        : never,
+      ReturnType<PA> extends {
+        error: infer E
+      }
+        ? E
+        : never
+    >
+  : never
+
 /**
  * Internal version of `ActionCreatorWithPreparedPayload`. Not to be used externally.
  *

packages/toolkit/src/createAsyncThunk.ts

@@ -105,7 +105,7 @@ export const miniSerializeError = (value: any): SerializedError => {
   return { message: String(value) }
 }
 
-type AsyncThunkConfig = {
+export type AsyncThunkConfig = {
   state?: unknown
   dispatch?: Dispatch
   extra?: unknown
@@ -414,7 +414,7 @@ export type AsyncThunk<
   typePrefix: string
 }
 
-type OverrideThunkApiConfigs<OldConfig, NewConfig> = Id<
+export type OverrideThunkApiConfigs<OldConfig, NewConfig> = Id<
   NewConfig & Omit<OldConfig, keyof NewConfig>
 >