Fix initialization on headerless Steam CEF pages

src/js/Content/Features/LegacyPage.ts

@@ -13,7 +13,7 @@ import ITAD from "@Content/Modules/ITAD";
 export default class LegacyPage extends Page {
 
     override check(): boolean {
-        return !!document.getElementById("global_header");
+        return !!document.querySelector("#global_header, .responsive_page_frame.no_header");
     }
 
     protected override async getAppConfig(factory: AppConfigFactory): Promise<AppConfig> {

src/js/Content/Features/Page.ts

@@ -53,12 +53,32 @@ export default abstract class Page {
     protected abstract getLanguage(factory: LanguageFactory): Promise<Language|null>;
     protected abstract getUser(factory: UserFactory): Promise<UserInterface>;
 
+    private async waitForCheck(timeout = 10000): Promise<boolean> {
+        if (this.check()) { return true; }
+
+        return new Promise(resolve => {
+            const observer = new MutationObserver(() => {
+                if (!this.check()) { return; }
+
+                window.clearTimeout(timeoutId);
+                observer.disconnect();
+                resolve(true);
+            });
+            const timeoutId = window.setTimeout(() => {
+                observer.disconnect();
+                resolve(false);
+            }, timeout);
+
+            observer.observe(document.documentElement, {childList: true, subtree: true});
+        });
+    }
+
     async run(): Promise<void> {
         if (document.querySelector("#as-menu")) {
             // already loaded
             return;
         }
-        if (!this.check()) { return; }
+        if (!await this.waitForCheck()) { return; }
 
         let language: Language|null;
         let user: UserInterface;

src/js/Content/Features/Store/App/PApp.ts

@@ -6,4 +6,17 @@
 import CApp from "@Content/Features/Store/App/CApp";
 import StorePage from "@Content/Features/StorePage";
 
-(new StorePage(CApp)).run();
+const page = new StorePage(CApp);
+const selector = ".page_content_ctn > .page_content, #error_box";
+
+if (document.querySelector(selector)) {
+    page.run();
+} else {
+    const observer = new MutationObserver(() => {
+        if (!document.querySelector(selector)) { return; }
+
+        observer.disconnect();
+        page.run();
+    });
+    observer.observe(document.documentElement, {childList: true, subtree: true});
+}

src/js/Content/Modules/AugmentedSteam.ts

@@ -32,7 +32,11 @@ export default class AugmentedSteam {
         const target = document.querySelector(this.react
             ? "header nav + div"
             : "#global_action_menu"
-        )!;
+        );
+        if (!target) {
+            console.warn("Augmented Steam menu is unavailable on this page");
+            return;
+        }
 
         (new AugmentedSteamMenu({
             target,
@@ -116,7 +120,8 @@ export default class AugmentedSteam {
             target = document.querySelector("header ~ section");
             anchor = target?.firstElementChild ?? null;
         } else {
-            const header = document.querySelector("#global_header")!
+            const header = document.querySelector("#global_header");
+            if (!header) { return; }
             target = header.parentElement!;
             anchor = header.nextElementSibling!;
         }