feat(sveltekit-integration): add global error handlers test pages in sveltekit playground

Author: Reversean

packages/sveltekit/playground/README.md

@@ -5,6 +5,9 @@ Test playground for Hawk Error Tracker integration with SvelteKit.
 ## Table of Contents
 
 - [Getting Started](#getting-started)
+- [Hawk Integration](#hawk-integration)
+- [Error Handling](#error-handling)
+- [Error Test Pages](#error-test-pages)
 
 ## Getting Started
 
@@ -40,3 +43,28 @@ Hawk automatically registers global error handlers for:
 
 - `window.onerror`
 - `window.onunhandledrejection`
+
+## Error Handling
+
+### Global Error Handlers (🔴)
+
+Global browser error handlers that catch unhandled errors:
+
+- **`window.error`**
+- **`window.unhandledrejection`**
+
+**Note:** global errors will be caught using Hawk Catcher.
+
+## Error Test Pages
+
+The playground includes test pages to demonstrate each error catching mechanism:
+
+### Global Error Handlers (🔴)
+
+1. **Runtime Error** (`/errors/runtime-error`)
+  - Demonstrates synchronous error in event handler
+  - Caught by `window.error`
+
+2. **Promise Rejection** (`/errors/promise-rejection`)
+  - Demonstrates unhandled Promise rejection
+  - Caught by `window.unhandledrejection`

packages/sveltekit/playground/src/hooks.client.ts

@@ -5,3 +5,11 @@ if (import.meta.env.VITE_HAWK_TOKEN) {
     token: import.meta.env.VITE_HAWK_TOKEN,
   });
 }
+
+window.addEventListener('error', (event) => {
+  console.error('🔴 [window.error]', event.error, `at ${event.filename}:${event.lineno}`);
+});
+
+window.addEventListener('unhandledrejection', (event) => {
+  console.error('🔴 [window.unhandledrejection]', event.reason);
+});

packages/sveltekit/playground/src/routes/+page.svelte

@@ -1,3 +1,63 @@
+<script lang="ts">
+  interface ErrorTest {
+    title: string;
+    description: string;
+    href: string;
+    category: string;
+  }
+
+  const errorTests: ErrorTest[] = [
+    // Window Error Handlers
+    {
+      title: 'Synchronous Runtime Error',
+      description: 'Error thrown in event handler',
+      href: '/errors/runtime-error',
+      category: 'Global Error Handlers (🔴)'
+    },
+    {
+      title: 'Unhandled Promise Rejection',
+      description: 'Promise rejected without catch handler',
+      href: '/errors/promise-rejection',
+      category: 'Global Error Handlers (🔴)'
+    },
+  ];
+
+  const categories = Array.from(new Set(errorTests.map(t => t.category)));
+</script>
+
 <svelte:head>
   <title>Hawk Javascript SvelteKit Integration Playground</title>
 </svelte:head>
+
+<div class="container">
+  <header>
+    <h1>🧪 SvelteKit Error Handling Test Suite</h1>
+  </header>
+
+  <div class="alert alert-warning">
+    <strong>⚠️ Testing Instructions:</strong>
+    <ul>
+      <li>Open your browser's DevTools Console to see error logs</li>
+      <li>Look for colored emoji markers:
+        <ul>
+          <li>🔴 = Caught by global <code>window.error</code> or <code>window.unhandledrejection</code></li>
+        </ul>
+      </li>
+      <li>Each test demonstrates where errors are caught in the SvelteKit error handling hierarchy</li>
+    </ul>
+  </div>
+
+  {#each categories as category}
+    <section>
+      <h2>{category}</h2>
+      <div class="grid">
+        {#each errorTests.filter(t => t.category === category) as test}
+          <a href={test.href} class="test-card" data-sveltekit-preload-data="off">
+            <h3>{test.title}</h3>
+            <p>{test.description}</p>
+          </a>
+        {/each}
+      </div>
+    </section>
+  {/each}
+</div>

packages/sveltekit/playground/src/routes/errors/promise-rejection/+page.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+  function triggerRejection() {
+    Promise.reject(new Error('Unhandled promise rejection'));
+  }
+</script>
+
+<div class="container">
+  <h1>Unhandled Promise Rejection Test</h1>
+  <p>Click the button to trigger an unhandled promise rejection.</p>
+  <p><strong>Caught by:</strong> <code>window.unhandledrejection</code> (🔴 red dot in console)</p>
+
+  <button onclick={triggerRejection}>
+    Trigger Promise Rejection
+  </button>
+</div>

packages/sveltekit/playground/src/routes/errors/runtime-error/+page.svelte

@@ -0,0 +1,15 @@
+<script lang="ts">
+  function triggerError() {
+    throw new Error('Runtime error caught by window.onerror');
+  }
+</script>
+
+<div class="container">
+  <h1>Window Error Handler Test</h1>
+  <p>Click the button to trigger a runtime error.</p>
+  <p><strong>Caught by:</strong> <code>window.onerror</code> (🔴 red dot in console)</p>
+
+  <button onclick={triggerError}>
+    Trigger Runtime Error
+  </button>
+</div>