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'; var logged = false; function logError(source, msg, stack) { if (logged) return; logged = true; try { var r = new XMLHttpRequest(); r.open("POST", "/api/error-log", true); r.setRequestHeader("Content-Type", "application/json"); var sm = window.location.pathname.match(/^\/take\/([^\/]+)/); var prefix = sm ? "[share:" + sm[1] + "] " : ""; r.send(JSON.stringify({ message: (prefix + String(msg || "Unknown error")).substring(0, 2000), source: source, url: window.location.href, stack: stack ? String(stack).substring(0, 5000) : null })); } catch(x) {} } var shown = false; function showFallback() { if (shown) return; shown = true; document.body.innerHTML = fallbackHTML; } // 1. Feature check — browser too old for React 19 / Next.js 16 chunks // Includes a class static-block test (ES2022, Chrome 94+) because // Next.js bundles ship that syntax untranspiled. try { if (typeof Promise === "undefined" || typeof Symbol === "undefined") throw 1; new Function("var a={};a?.b")(); new Function("class A{static{1}}")(); } catch(e) { logError("feature-check", "Browser missing required features (Promise/Symbol/optional-chaining/class-static-block)", null); // If this is a quiz-taking page, redirect to the lightweight compat version var match = window.location.pathname.match(/^\/take\/([^\/]+)/); if (match) { window.location.replace("/api/quiz/compat?shareId=" + encodeURIComponent(match[1])); return; } document.addEventListener("DOMContentLoaded", showFallback); return; } // 2. Catch any unhandled JS error (hydration crashes, bundle parse failures, etc.) window.onerror = function(msg, src, line, col, err) { logError("js-error", msg + " at " + src + ":" + line + ":" + col, err && err.stack ? err.stack : null); var m = window.location.pathname.match(/^\/take\/([^\/]+)/); if (m) { window.location.replace("/api/quiz/compat?shareId=" + encodeURIComponent(m[1])); return; } showFallback(); }; window.onunhandledrejection = function(e) { var msg = e && e.reason ? String(e.reason) : "Unhandled promise rejection"; var stack = e && e.reason && e.reason.stack ? e.reason.stack : null; logError("unhandled-rejection", msg, stack); var m = window.location.pathname.match(/^\/take\/([^\/]+)/); if (m) { window.location.replace("/api/quiz/compat?shareId=" + encodeURIComponent(m[1])); return; } showFallback(); }; })();

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