feat(onStateChange): provide prevState (#335)

algolia · Oct 12, 2020 · 21739b4 · 21739b4
1 parent a20887d
commit 21739b4
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Showing 2 changed files with 10 additions and 3 deletions.
diff --git a/packages/autocomplete-core/src/createStore.ts b/packages/autocomplete-core/src/createStore.ts
@@ -25,6 +25,7 @@ export function createStore<TItem>(
       return state;
     },
     send(action, payload) {
+      const prevState = { ...state };
       state = enhanceState(
         reducer(state, {
           type: action,
@@ -33,7 +34,7 @@ export function createStore<TItem>(
         })
       );
 
-      props.onStateChange({ state });
+      props.onStateChange({ state, prevState });
     },
   };
 }
diff --git a/packages/autocomplete-core/src/types/api.ts b/packages/autocomplete-core/src/types/api.ts
@@ -198,7 +198,10 @@ export interface AutocompleteOptions<TItem> {
   /**
    * Function called when the internal state changes.
    */
-  onStateChange?<TItem>(props: { state: AutocompleteState<TItem> }): void;
+  onStateChange?<TItem>(props: {
+    state: AutocompleteState<TItem>;
+    prevState: AutocompleteState<TItem>;
+  }): void;
   /**
    * The text that appears in the search box input when there is no query.
    */
@@ -282,7 +285,10 @@ export interface InternalAutocompleteOptions<TItem>
   extends AutocompleteOptions<TItem> {
   debug: boolean;
   id: string;
-  onStateChange<TItem>(props: { state: AutocompleteState<TItem> }): void;
+  onStateChange<TItem>(props: {
+    state: AutocompleteState<TItem>;
+    prevState: AutocompleteState<TItem>;
+  }): void;
   placeholder: string;
   autoFocus: boolean;
   defaultHighlightedIndex: number | null;