rustdoc.d.ts: window.SIDEBAR_ITEMS may exist.

Author: lolbinarycat

src/librustdoc/html/static/js/main.js

@@ -585,7 +585,6 @@ function preLoadCss(cssUrl) {
     document.addEventListener("keydown", handleShortcut);
 
     function addSidebarItems() {
-        // @ts-expect-error
         if (!window.SIDEBAR_ITEMS) {
             return;
         }

src/librustdoc/html/static/js/rustdoc.d.ts

@@ -7,6 +7,8 @@ declare global {
     interface Window {
         /** Make the current theme easy to find */
         currentTheme: HTMLLinkElement|null;
+        /** Generated in `render/context.rs` */
+        SIDEBAR_ITEMS?: { [key: string]: string[] };
         /** Used by the popover tooltip code. */
         RUSTDOC_TOOLTIP_HOVER_MS: number;
         /** Used by the popover tooltip code. */