From 1ea94111cb8b69801994c3359d1ce760ef8be6ce Mon Sep 17 00:00:00 2001
From: Reversean <odaving111@gmail.com>
Date: Wed, 24 Dec 2025 12:32:56 +0300
Subject: [PATCH 1/2] feat(sveltekit-integration): add global error handlers
 test pages in sveltekit playground

---
 packages/sveltekit/playground/README.md       |  28 +++
 packages/sveltekit/playground/src/app.css     | 169 ++++++++++++++++++
 .../sveltekit/playground/src/hooks.client.ts  |   8 +
 .../playground/src/routes/+page.svelte        |  60 +++++++
 .../errors/promise-rejection/+page.svelte     |  15 ++
 .../routes/errors/runtime-error/+page.svelte  |  15 ++
 6 files changed, 295 insertions(+)
 create mode 100644 packages/sveltekit/playground/src/routes/errors/promise-rejection/+page.svelte
 create mode 100644 packages/sveltekit/playground/src/routes/errors/runtime-error/+page.svelte

diff --git a/packages/sveltekit/playground/README.md b/packages/sveltekit/playground/README.md
index 8151b23..09f6dac 100644
--- a/packages/sveltekit/playground/README.md
+++ b/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`
diff --git a/packages/sveltekit/playground/src/app.css b/packages/sveltekit/playground/src/app.css
index e69de29..40f3c7b 100644
--- a/packages/sveltekit/playground/src/app.css
+++ b/packages/sveltekit/playground/src/app.css
@@ -0,0 +1,169 @@
+@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap');
+
+:root {
+  --bg-primary: #2f3341;
+  --bg-secondary: #242732;
+  --text-primary: #dbe6ff;
+  --text-secondary: rgba(219, 230, 255, 0.6);
+  --border-color: rgba(219, 230, 255, 0.1);
+  --button-primary: #4979e4;
+  --button-primary-hover: #4869d2;
+}
+
+body {
+  font-family: Roboto, system-ui, sans-serif;
+  margin: 0;
+  padding: 0;
+  background: var(--bg-primary);
+  color: var(--text-primary);
+  font-size: 13px;
+}
+
+header {
+  padding: 30px;
+  background: var(--bg-secondary);
+}
+
+h1 {
+  font-weight: bold;
+  font-size: 20px;
+  margin: 0 0 15px;
+  color: var(--text-primary);
+}
+
+h2 {
+  font-weight: 500;
+  margin: 0 0 10px;
+  font-size: 13px;
+  color: var(--text-secondary);
+  letter-spacing: 0.24px;
+  text-transform: uppercase;
+}
+
+h3 {
+  margin: 0 0 10px 0;
+  color: var(--text-primary);
+  font-size: 16px;
+  font-weight: 500;
+}
+
+p {
+  margin: 0.5rem 0;
+  color: var(--text-primary);
+}
+
+a {
+  color: inherit;
+  text-decoration: underline;
+}
+
+a:hover {
+  color: var(--button-primary);
+}
+
+section {
+  padding: 15px;
+  border: 1px solid var(--border-color);
+  border-radius: 4px;
+  margin: 15px;
+}
+
+button {
+  display: inline-block;
+  padding: 8px 20px;
+  border: 0;
+  border-radius: 5px;
+  background: var(--button-primary);
+  color: var(--text-primary);
+  font-weight: 500;
+  font-size: 14px;
+  cursor: pointer;
+  font-family: inherit;
+}
+
+button:hover {
+  background: var(--button-primary-hover);
+}
+
+button:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
+code {
+  background: var(--bg-secondary);
+  padding: 2px 6px;
+  border-radius: 3px;
+  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
+  font-size: 0.9em;
+}
+
+.container {
+  max-width: 1200px;
+  margin: 0 auto;
+  padding: 20px;
+}
+
+.grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
+  gap: 15px;
+}
+
+.test-card {
+  display: block;
+  padding: 20px;
+  border: 2px solid var(--border-color);
+  border-radius: 8px;
+  text-decoration: none;
+  color: inherit;
+  transition: all 0.2s ease;
+  background: var(--bg-secondary);
+}
+
+.test-card:hover {
+  border-color: var(--button-primary);
+  transform: translateY(-2px);
+  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
+}
+
+.test-card h3 {
+  margin: 0 0 10px 0;
+  font-size: 16px;
+}
+
+.test-card p {
+  margin: 0;
+  color: var(--text-secondary);
+  font-size: 13px;
+  line-height: 1.5;
+}
+
+.alert {
+  padding: 15px;
+  border-left: 4px solid;
+  border-radius: 4px;
+  margin: 15px 0;
+}
+
+.alert-warning {
+  background: rgba(255, 193, 7, 0.15);
+  border-color: #ffc107;
+  color: #ffd54f;
+}
+
+.error-fallback {
+  padding: 1.5rem;
+  background: rgba(244, 67, 54, 0.15);
+  border-left: 4px solid #f44336;
+  border-radius: 4px;
+}
+
+.error-fallback h3 {
+  margin: 0 0 0.5rem 0;
+  color: #ff8a80;
+}
+
+.error-fallback p {
+  margin: 0.5rem 0;
+}
diff --git a/packages/sveltekit/playground/src/hooks.client.ts b/packages/sveltekit/playground/src/hooks.client.ts
index 4154746..c5b84ef 100644
--- a/packages/sveltekit/playground/src/hooks.client.ts
+++ b/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);
+});
diff --git a/packages/sveltekit/playground/src/routes/+page.svelte b/packages/sveltekit/playground/src/routes/+page.svelte
index dcea8f7..564ba4f 100644
--- a/packages/sveltekit/playground/src/routes/+page.svelte
+++ b/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>
diff --git a/packages/sveltekit/playground/src/routes/errors/promise-rejection/+page.svelte b/packages/sveltekit/playground/src/routes/errors/promise-rejection/+page.svelte
new file mode 100644
index 0000000..3a9213b
--- /dev/null
+++ b/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>
diff --git a/packages/sveltekit/playground/src/routes/errors/runtime-error/+page.svelte b/packages/sveltekit/playground/src/routes/errors/runtime-error/+page.svelte
new file mode 100644
index 0000000..c3dc671
--- /dev/null
+++ b/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>

From 1812102c389c60afd9a1702cf85a4853d8ddd3d0 Mon Sep 17 00:00:00 2001
From: Reversean <odaving111@gmail.com>
Date: Wed, 24 Dec 2025 12:38:24 +0300
Subject: [PATCH 2/2] feat(sveltekit-integration): add error boundary test page
 in sveltekit playground

---
 packages/sveltekit/playground/README.md       | 24 +++++++++++++
 .../playground/src/routes/+page.svelte        |  9 +++++
 .../errors/component-render/+page.svelte      | 36 +++++++++++++++++++
 .../component-render/ErrorComponent.svelte    |  9 +++++
 4 files changed, 78 insertions(+)
 create mode 100644 packages/sveltekit/playground/src/routes/errors/component-render/+page.svelte
 create mode 100644 packages/sveltekit/playground/src/routes/errors/component-render/ErrorComponent.svelte

diff --git a/packages/sveltekit/playground/README.md b/packages/sveltekit/playground/README.md
index 09f6dac..59f2e34 100644
--- a/packages/sveltekit/playground/README.md
+++ b/packages/sveltekit/playground/README.md
@@ -55,6 +55,23 @@ Global browser error handlers that catch unhandled errors:
 
 **Note:** global errors will be caught using Hawk Catcher.
 
+### Error Boundaries (🟡)
+
+Svelte `<svelte:boundary>` catches errors during:
+
+- Component rendering (synchronous errors in component body)
+- Component initialization
+
+Example usage:
+
+```svelte
+<svelte:boundary onerror={handleBoundaryError} failed={fallback}>
+  <ErrorProneComponent />
+</svelte:boundary>
+```
+
+**Note:** error boundaries will be caught using Hawk Catcher.
+
 ## Error Test Pages
 
 The playground includes test pages to demonstrate each error catching mechanism:
@@ -68,3 +85,10 @@ The playground includes test pages to demonstrate each error catching mechanism:
 2. **Promise Rejection** (`/errors/promise-rejection`)
   - Demonstrates unhandled Promise rejection
   - Caught by `window.unhandledrejection`
+
+### Error Boundaries (🟡)
+
+3. **Component Render Error** (`/errors/component-render`)
+  - Demonstrates error during component rendering
+  - Caught by `<svelte:boundary>`
+
diff --git a/packages/sveltekit/playground/src/routes/+page.svelte b/packages/sveltekit/playground/src/routes/+page.svelte
index 564ba4f..c9b0d9e 100644
--- a/packages/sveltekit/playground/src/routes/+page.svelte
+++ b/packages/sveltekit/playground/src/routes/+page.svelte
@@ -20,6 +20,14 @@
       href: '/errors/promise-rejection',
       category: 'Global Error Handlers (🔴)'
     },
+
+    // Error Boundaries
+    {
+      title: 'Component Rendering Error',
+      description: 'Error thrown during component render',
+      href: '/errors/component-render',
+      category: 'Error Boundaries (🟡)'
+    },
   ];
 
   const categories = Array.from(new Set(errorTests.map(t => t.category)));
@@ -41,6 +49,7 @@
       <li>Look for colored emoji markers:
         <ul>
           <li>🔴 = Caught by global <code>window.error</code> or <code>window.unhandledrejection</code></li>
+          <li>🟡 = Caught by <code>&lt;svelte:boundary&gt;</code></li>
         </ul>
       </li>
       <li>Each test demonstrates where errors are caught in the SvelteKit error handling hierarchy</li>
diff --git a/packages/sveltekit/playground/src/routes/errors/component-render/+page.svelte b/packages/sveltekit/playground/src/routes/errors/component-render/+page.svelte
new file mode 100644
index 0000000..215a44d
--- /dev/null
+++ b/packages/sveltekit/playground/src/routes/errors/component-render/+page.svelte
@@ -0,0 +1,36 @@
+<script lang="ts">
+  import ErrorComponent from './ErrorComponent.svelte';
+
+  let showError = $state(false);
+
+  function triggerError() {
+    showError = true;
+  }
+
+  function handleBoundaryError(error: Error) {
+    console.error('🟡 [svelte:boundary] Caught rendering error:', error);
+  }
+</script>
+
+<div class="container">
+  <h1>Error Boundary - Rendering Test</h1>
+  <p>Click the button to trigger a component rendering error.</p>
+  <p><strong>Caught by:</strong> <code>&lt;svelte:boundary&gt;</code> (🟡 yellow dot in console)</p>
+
+  <button onclick={triggerError} disabled={showError}>
+    Trigger Rendering Error
+  </button>
+
+  {#snippet fallback(error)}
+    <div class="error-fallback">
+      <h3>Error Boundary Caught Error</h3>
+      <p>Message: {error.message}</p>
+    </div>
+  {/snippet}
+
+  <svelte:boundary onerror={handleBoundaryError} failed={fallback}>
+    {#if showError}
+      <ErrorComponent shouldError={true} />
+    {/if}
+  </svelte:boundary>
+</div>
diff --git a/packages/sveltekit/playground/src/routes/errors/component-render/ErrorComponent.svelte b/packages/sveltekit/playground/src/routes/errors/component-render/ErrorComponent.svelte
new file mode 100644
index 0000000..13dc02d
--- /dev/null
+++ b/packages/sveltekit/playground/src/routes/errors/component-render/ErrorComponent.svelte
@@ -0,0 +1,9 @@
+<script lang="ts">
+  let { shouldError }: { shouldError: boolean } = $props();
+
+  if (shouldError) {
+    throw new Error('Rendering error caught by svelte:boundary');
+  }
+</script>
+
+<div>This should not render if error is thrown</div>