feat: Fluent UI Outlook Lite + connections mockup

node_modules/@fluentui/react-tree/lib/hooks/useControllableOpenItems.js

@@ -0,0 +1,20 @@
+'use client';
+import { useControllableState } from '@fluentui/react-utilities';
+import * as React from 'react';
+import { ImmutableSet } from '../utils/ImmutableSet';
+/**
+ * @internal
+ */ export function useControllableOpenItems(props) {
+    return useControllableState({
+        state: React.useMemo(()=>props.openItems && ImmutableSet.from(props.openItems), [
+            props.openItems
+        ]),
+        defaultState: props.defaultOpenItems && (()=>ImmutableSet.from(props.defaultOpenItems)),
+        initialState: ImmutableSet.empty
+    });
+}
+/**
+ * @internal
+ */ export function createNextOpenItems(data, previousOpenItems) {
+    return data.open ? previousOpenItems.add(data.value) : previousOpenItems.delete(data.value);
+}