Add TypeScript type for window.ALL_CRATES.

Author: kpreid

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

@@ -1004,7 +1004,6 @@ function preLoadCss(cssUrl) {
     }
 
     function addSidebarCrates() {
-        // @ts-expect-error
         if (!window.ALL_CRATES) {
             return;
         }
@@ -1018,7 +1017,6 @@ function preLoadCss(cssUrl) {
         const ul = document.createElement("ul");
         ul.className = "block crate";
 
-        // @ts-expect-error
         for (const crate of window.ALL_CRATES) {
             const link = document.createElement("a");
             link.href = window.rootPath + crate + "/index.html";

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;
+        /** List of all documented crates. */
+        ALL_CRATES: string[]|undefined;
         /** Used by the popover tooltip code. */
         RUSTDOC_TOOLTIP_HOVER_MS: number;
         /** Used by the popover tooltip code. */