From 51116a06a01ceb48dabc8a4955f9f7157aaa31a3 Mon Sep 17 00:00:00 2001
From: t <t@t>
Date: Mon, 29 Jun 2026 11:19:14 +0530
Subject: [PATCH] chore: diag v12 - try/catch createInstance to surface the iOS
 throw (#730) (TEMP)

v11 showed compile()/createInstance throws before any internal log on iOS. v12
wraps the createInstance call in render() with try/catch and logs the error
message + stack frames, pinning the exact failing line. Gated; reverted after.
---
 packages/core/src/render-client.js            | 14 ++++++++++++++
 packages/ui/packages/website/app/diag/page.ts |  2 +-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/packages/core/src/render-client.js b/packages/core/src/render-client.js
index 5c87edd8e..c4d899b60 100644
--- a/packages/core/src/render-client.js
+++ b/packages/core/src/render-client.js
@@ -113,6 +113,20 @@ export function render(value, container) {
       firstChild.remove();
     }
 
+    if (__D) {
+      // TEMP #730: capture the exact throw + stack frame for the probe.
+      try {
+        const inst = createInstance(tr, container);
+        host[INSTANCE] = inst;
+        __D.push('createInstance OK');
+      } catch (e) {
+        __D.push('THREW msg=' + (e && /** @type any */ (e).message));
+        __D.push('stack=' + (e && /** @type any */ (e).stack ? String(/** @type any */ (e).stack).split('\n').slice(0, 5).join(' || ') : 'none'));
+        throw e;
+      }
+      return;
+    }
+
     const inst = createInstance(tr, container);
     host[INSTANCE] = inst;
     return;
diff --git a/packages/ui/packages/website/app/diag/page.ts b/packages/ui/packages/website/app/diag/page.ts
index b7711ceb3..50f30daa6 100644
--- a/packages/ui/packages/website/app/diag/page.ts
+++ b/packages/ui/packages/website/app/diag/page.ts
@@ -57,7 +57,7 @@ export default function Diag() {
   return html`
     ${unsafeHTML(EARLY)}
     <main style="padding:1rem;font-family:system-ui;max-width:100%">
-      <h1 style="font-size:1.1rem">webjs Tier-2 iOS diagnostic v11 (#730)</h1>
+      <h1 style="font-size:1.1rem">webjs Tier-2 iOS diagnostic v12 (#730)</h1>
       <p style="font-size:.85rem;color:#666">Wait about 2s, then copy the whole readout and send it to me. The page stays scrollable.</p>
       <button onclick="location.reload()" style="margin-bottom:.75rem" class=${buttonClass({ variant: 'outline', size: 'sm' })}>Re-run</button>
       <pre id="wjdiag" style="white-space:pre-wrap;word-break:break-word;font:12px/1.5 monospace;background:#f4f4f5;color:#111;padding:1rem;border-radius:8px;border:1px solid #ccc">collecting (wait about 2s)...</pre>