add window dec

Author: chdeskur

packages/fern-docs/components/src/declarations.d.ts

@@ -0,0 +1,20 @@
+// Global type declarations for the fern-docs/components package
+
+declare global {
+    interface Window {
+        /**
+         * Used to restore sidebar scroll position after navigation.
+         * This helps maintain scroll state when the sidebar is re-mounted
+         * in Next.js App Router.
+         */
+        _FERN_SIDEBAR_SCROLL_RESTORATION?: number;
+
+        /**
+         * Cancellation callback for the scroll sidebar node into view operation.
+         * Used to cancel pending scroll operations when a new one is triggered.
+         */
+        __FERN_CANCEL_SCROLL_SIDEBAR_NODE_INTO_VIEW?: () => void;
+    }
+}
+
+export {};