Pass displayed data as second parameter of functional optimistic data

vercel · Jun 17, 2023 · 6aebe3b · 6aebe3b
1 parent 55bfc88
commit 6aebe3b
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/_internal/src/types.ts b/_internal/src/types.ts
@@ -317,7 +317,9 @@ export type MutatorOptions<Data = any> = {
   populateCache?:
     | boolean
     | ((result: any, currentData: Data | undefined) => Data)
-  optimisticData?: Data | ((currentData?: Data) => Data)
+  optimisticData?:
+    | Data
+    | ((currentData: Data | undefined, displayedData: Data | undefined) => Data)
   rollbackOnError?: boolean | ((error: unknown) => boolean)
   throwOnError?: boolean
 }

diff --git a/_internal/src/utils/mutate.ts b/_internal/src/utils/mutate.ts
@@ -139,7 +139,7 @@ export async function internalMutate<Data>(
     // Do optimistic data update.
     if (hasOptimisticData) {
       optimisticData = isFunction(optimisticData)
-        ? optimisticData(committedData)
+        ? optimisticData(committedData, displayedData)
         : optimisticData
 
       // When we set optimistic data, backup the current committedData data in `_c`.