diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 09f91e6..fade885 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -16,10 +16,24 @@ jobs:
       - run: yarn install
       - run: yarn lint-test
 
-  build:
+  test:
     runs-on: ubuntu-latest
     env:
       CI_JOB_NUMBER: 2
+    steps:
+      - uses: actions/checkout@v1
+      - name: Use Node.js from .nvmrc
+        uses: actions/setup-node@v6
+        with:
+          node-version-file: '.nvmrc'
+      - run: corepack enable
+      - run: yarn install
+      - run: yarn workspace @hawk.so/javascript test
+
+  build:
+    runs-on: ubuntu-latest
+    env:
+      CI_JOB_NUMBER: 3
     steps:
       - uses: actions/checkout@v1
         with:
diff --git a/packages/javascript/README.md b/packages/javascript/README.md
index c541694..8cd86fc 100644
--- a/packages/javascript/README.md
+++ b/packages/javascript/README.md
@@ -89,7 +89,7 @@ Initialization settings:
 | `disableVueErrorHandler`      | boolean                                                   | optional     | Do not initialize Vue errors handling                                               |
 | `consoleTracking`             | boolean                                                   | optional     | Initialize console logs tracking                                                    |
 | `breadcrumbs`                 | false or BreadcrumbsOptions object                        | optional     | Configure breadcrumbs tracking (see below)                                          |
-| `beforeSend`                  | function(event) => event                                  | optional     | This Method allows you to filter any data you don't want sending to Hawk            |
+| `beforeSend`                  | function(event) => event \| false \| void                 | optional     | Filter data before sending. Return modified event, `false` to drop the event.       |
 
 Other available [initial settings](types/hawk-initial-settings.d.ts) are described at the type definition.
 
@@ -187,7 +187,7 @@ const hawk = new HawkCatcher({
     beforeBreadcrumb: (breadcrumb, hint) => {
       // Filter or modify breadcrumbs before storing
       if (breadcrumb.category === 'fetch' && breadcrumb.data?.url?.includes('/sensitive')) {
-        return null; // Discard this breadcrumb
+        return false; // Discard this breadcrumb
       }
       return breadcrumb;
     }
@@ -203,7 +203,7 @@ const hawk = new HawkCatcher({
 | `trackFetch` | `boolean` | `true` | Automatically track `fetch()` and `XMLHttpRequest` calls as breadcrumbs. Captures request URL, method, status code, and response time. |
 | `trackNavigation` | `boolean` | `true` | Automatically track navigation events (History API: `pushState`, `replaceState`, `popstate`). Captures route changes. |
 | `trackClicks` | `boolean` | `true` | Automatically track UI click events. Captures element selector, coordinates, and other click metadata. |
-| `beforeBreadcrumb` | `function` | `undefined` | Hook called before each breadcrumb is stored. Receives `(breadcrumb, hint)` and can return modified breadcrumb, `null` to discard it, or the original breadcrumb. Useful for filtering sensitive data or PII. |
+| `beforeBreadcrumb` | `function` | `undefined` | Hook called before each breadcrumb is stored. Receives `(breadcrumb, hint)`. Return modified breadcrumb to keep it, `false` to discard. |
 
 ### Manual Breadcrumbs
 
diff --git a/packages/javascript/example/index.html b/packages/javascript/example/index.html
index 91f6185..c8a050b 100644
--- a/packages/javascript/example/index.html
+++ b/packages/javascript/example/index.html
@@ -312,7 +312,7 @@ <h2>Test Vue integration: &lt;test-component&gt;</h2>
         //   beforeBreadcrumb: (breadcrumb, hint) => {
         //     // Filter or modify breadcrumbs before storing
         //     if (breadcrumb.category === 'fetch' && breadcrumb.data?.url?.includes('/sensitive')) {
-        //       return null; // Discard this breadcrumb
+        //       return false; // Discard this breadcrumb
         //     }
         //     return breadcrumb;
         //   }
diff --git a/packages/javascript/package.json b/packages/javascript/package.json
index a9d4b44..dfb7b94 100644
--- a/packages/javascript/package.json
+++ b/packages/javascript/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hawk.so/javascript",
-  "version": "3.2.15",
+  "version": "3.2.16",
   "description": "JavaScript errors tracking for Hawk.so",
   "files": [
     "dist"
@@ -20,6 +20,8 @@
     "dev": "vite",
     "build": "vite build",
     "stats": "size-limit > stats.txt",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "lint": "eslint --fix \"src/**/*.{js,ts}\""
   },
   "repository": {
@@ -40,9 +42,11 @@
     "error-stack-parser": "^2.1.4"
   },
   "devDependencies": {
-    "@hawk.so/types": "0.5.2",
+    "@hawk.so/types": "0.5.8",
+    "jsdom": "^28.0.0",
     "vite": "^7.3.1",
     "vite-plugin-dts": "^4.2.4",
+    "vitest": "^4.0.18",
     "vue": "^2"
   }
 }
diff --git a/packages/javascript/src/addons/breadcrumbs.ts b/packages/javascript/src/addons/breadcrumbs.ts
index 8c5361a..10a7a96 100644
--- a/packages/javascript/src/addons/breadcrumbs.ts
+++ b/packages/javascript/src/addons/breadcrumbs.ts
@@ -5,6 +5,7 @@ import type { Breadcrumb, BreadcrumbLevel, BreadcrumbType, Json, JsonNode } from
 import Sanitizer from '../modules/sanitizer';
 import { buildElementSelector } from '../utils/selector';
 import log from '../utils/log';
+import { isValidBreadcrumb } from '../utils/validation';
 
 /**
  * Default maximum number of breadcrumbs to store
@@ -48,11 +49,13 @@ export interface BreadcrumbsOptions {
   maxBreadcrumbs?: number;
 
   /**
-   * Hook called before each breadcrumb is stored
-   * Return null to discard the breadcrumb
-   * Return modified breadcrumb to store it
+   * Hook called before each breadcrumb is stored.
+   * - Return modified breadcrumb — it will be stored instead of the original.
+   * - Return `false` — the breadcrumb will be discarded.
+   * - Return nothing (`void` / `undefined` / `null`) — the original breadcrumb is stored as-is (a warning is logged).
+   * - If the hook returns an invalid value, a warning is logged and the original breadcrumb is stored.
    */
-  beforeBreadcrumb?: (breadcrumb: Breadcrumb, hint?: BreadcrumbHint) => Breadcrumb | null;
+  beforeBreadcrumb?: (breadcrumb: Breadcrumb, hint?: BreadcrumbHint) => Breadcrumb | false | void;
 
   /**
    * Enable automatic fetch/XHR breadcrumbs
@@ -91,7 +94,7 @@ interface InternalBreadcrumbsOptions {
   trackFetch: boolean;
   trackNavigation: boolean;
   trackClicks: boolean;
-  beforeBreadcrumb?: (breadcrumb: Breadcrumb, hint?: BreadcrumbHint) => Breadcrumb | null;
+  beforeBreadcrumb?: (breadcrumb: Breadcrumb, hint?: BreadcrumbHint) => Breadcrumb | false | void;
 }
 
 /**
@@ -233,16 +236,30 @@ export class BreadcrumbManager {
      * Apply beforeBreadcrumb hook
      */
     if (this.options.beforeBreadcrumb) {
-      const result = this.options.beforeBreadcrumb(bc, hint);
+      const breadcrumbClone = structuredClone(bc);
+      const result = this.options.beforeBreadcrumb(breadcrumbClone, hint);
 
-      if (result === null) {
-        /**
-         * Discard breadcrumb
-         */
+      /**
+       * false means discard
+       */
+      if (result === false) {
         return;
       }
 
-      Object.assign(bc, result);
+      /**
+       * Valid breadcrumb → apply changes from hook
+       */
+      if (isValidBreadcrumb(result)) {
+        Object.assign(bc, result);
+      } else {
+        /**
+         * Anything else is invalid — warn, bc stays untouched (hook only received a clone)
+         */
+        log(
+          'Invalid beforeBreadcrumb value. It should return breadcrumb or false. Breadcrumb is stored without changes.',
+          'warn'
+        );
+      }
     }
 
     /**
diff --git a/packages/javascript/src/addons/consoleCatcher.ts b/packages/javascript/src/addons/consoleCatcher.ts
index 16815ab..29519ea 100644
--- a/packages/javascript/src/addons/consoleCatcher.ts
+++ b/packages/javascript/src/addons/consoleCatcher.ts
@@ -150,7 +150,7 @@ export class ConsoleCatcher {
    *   This ensures DevTools will navigate to the user's code, not the interceptor's code.
    *
    * @param errorStack - Full stack trace string from Error.stack
-   * @returns Object with userStack (full stack from user code) and fileLine (first frame for DevTools link)
+   * @returns {object} Object with userStack (full stack from user code) and fileLine (first frame for DevTools link)
    */
   private extractUserStack(errorStack: string | undefined): {
     userStack: string;
@@ -250,7 +250,7 @@ export class ConsoleCatcher {
        * 4. Store it in the buffer
        * 5. Forward the call to the native console (so output still appears in DevTools)
        *
-       * @param {...any} args
+       * @param args - console method arguments
        */
       window.console[method] = (...args: unknown[]): void => {
         // Capture full stack trace and extract user code stack
diff --git a/packages/javascript/src/catcher.ts b/packages/javascript/src/catcher.ts
index 313ba93..0646507 100644
--- a/packages/javascript/src/catcher.ts
+++ b/packages/javascript/src/catcher.ts
@@ -2,7 +2,7 @@ import Socket from './modules/socket';
 import Sanitizer from './modules/sanitizer';
 import log from './utils/log';
 import StackParser from './modules/stackParser';
-import type { CatcherMessage, HawkInitialSettings, BreadcrumbsAPI } from './types';
+import type { CatcherMessage, HawkInitialSettings, BreadcrumbsAPI, Transport } from './types';
 import { VueIntegration } from './integrations/vue';
 import { id } from './utils/id';
 import type {
@@ -10,7 +10,7 @@ import type {
   EventContext,
   JavaScriptAddons,
   VueIntegrationAddons,
-  Json, EncodedIntegrationToken, DecodedIntegrationToken,
+  Json, EncodedIntegrationToken, DecodedIntegrationToken
 } from '@hawk.so/types';
 import type { JavaScriptCatcherIntegrations } from './types/integrations';
 import { EventRejectedError } from './errors';
@@ -18,7 +18,7 @@ import type { HawkJavaScriptEvent } from './types';
 import { isErrorProcessed, markErrorAsProcessed } from './utils/event';
 import { ConsoleCatcher } from './addons/consoleCatcher';
 import { BreadcrumbManager } from './addons/breadcrumbs';
-import { validateUser, validateContext } from './utils/validation';
+import { validateUser, validateContext, isValidEventPayload } from './utils/validation';
 
 /**
  * Allow to use global VERSION, that will be overwritten by Webpack
@@ -73,16 +73,18 @@ export default class Catcher {
   private context: EventContext | undefined;
 
   /**
-   * This Method allows developer to filter any data you don't want sending to Hawk
-   * If method returns false, event will not be sent
+   * This Method allows developer to filter any data you don't want sending to Hawk.
+   * - Return modified event — it will be sent instead of the original.
+   * - Return `false` — the event will be dropped entirely.
+   * - Any other value is invalid — the original event is sent as-is (a warning is logged).
    */
-  private readonly beforeSend: undefined | ((event: HawkJavaScriptEvent) => HawkJavaScriptEvent | false);
+  private readonly beforeSend: undefined | ((event: HawkJavaScriptEvent) => HawkJavaScriptEvent | false | void);
 
   /**
    * Transport for dialog between Catcher and Collector
-   * (WebSocket decorator)
+   * (WebSocket decorator by default, or custom via settings.transport)
    */
-  private readonly transport: Socket;
+  private readonly transport: Transport;
 
   /**
    * Module for parsing backtrace
@@ -148,7 +150,7 @@ export default class Catcher {
     /**
      * Init transport
      */
-    this.transport = new Socket({
+    this.transport = settings.transport ?? new Socket({
       collectorEndpoint: settings.collectorEndpoint || `wss://${this.getIntegrationId()}.k1.hawk.so:443/ws`,
       reconnectionAttempts: settings.reconnectionAttempts,
       reconnectionTimeout: settings.reconnectionTimeout,
@@ -436,12 +438,29 @@ export default class Catcher {
      * Filter sensitive data
      */
     if (typeof this.beforeSend === 'function') {
-      const beforeSendResult = this.beforeSend(payload);
+      const eventPayloadClone = structuredClone(payload);
+      const result = this.beforeSend(eventPayloadClone);
 
-      if (beforeSendResult === false) {
+      /**
+       * false → drop event
+       */
+      if (result === false) {
         throw new EventRejectedError('Event rejected by beforeSend method.');
+      }
+
+      /**
+       * Valid event payload → use it instead of original
+       */
+      if (isValidEventPayload(result)) {
+        payload = result as HawkJavaScriptEvent;
       } else {
-        payload = beforeSendResult;
+        /**
+         * Anything else is invalid — warn, payload stays untouched (hook only received a clone)
+         */
+        log(
+          'Invalid beforeSend value. It should return event or false. Event is sent without changes.',
+          'warn'
+        );
       }
     }
 
diff --git a/packages/javascript/src/modules/socket.ts b/packages/javascript/src/modules/socket.ts
index c07af1d..eb64b59 100644
--- a/packages/javascript/src/modules/socket.ts
+++ b/packages/javascript/src/modules/socket.ts
@@ -1,12 +1,13 @@
 import log from '../utils/log';
 import type { CatcherMessage } from '@/types';
+import type { Transport } from '../types/transport';
 
 /**
  * Custom WebSocket wrapper class
  *
  * @copyright CodeX
  */
-export default class Socket {
+export default class Socket implements Transport {
   /**
    * Socket connection endpoint
    */
diff --git a/packages/javascript/src/types/hawk-initial-settings.ts b/packages/javascript/src/types/hawk-initial-settings.ts
index 51e80f0..987cdf4 100644
--- a/packages/javascript/src/types/hawk-initial-settings.ts
+++ b/packages/javascript/src/types/hawk-initial-settings.ts
@@ -1,5 +1,6 @@
 import type { EventContext, AffectedUser } from '@hawk.so/types';
 import type { HawkJavaScriptEvent } from './event';
+import type { Transport } from './transport';
 import type { BreadcrumbsOptions } from '../addons/breadcrumbs';
 
 /**
@@ -65,10 +66,11 @@ export interface HawkInitialSettings {
 
   /**
    * This Method allows you to filter any data you don't want sending to Hawk.
-   *
-   * Return `false` to prevent the event from being sent to Hawk.
+   * - Return modified event — it will be sent instead of the original.
+   * - Return `false` — the event will be dropped entirely.
+   * - Any other value is invalid — the original event is sent as-is (a warning is logged).
    */
-  beforeSend?(event: HawkJavaScriptEvent): HawkJavaScriptEvent | false;
+  beforeSend?(event: HawkJavaScriptEvent): HawkJavaScriptEvent | false | void;
 
   /**
    * Disable Vue.js error handler
@@ -90,4 +92,10 @@ export interface HawkInitialSettings {
    * @default enabled with default options
    */
   breadcrumbs?: false | BreadcrumbsOptions;
+
+  /**
+   * Custom transport for sending events.
+   * If not provided, default WebSocket transport is used.
+   */
+  transport?: Transport;
 }
diff --git a/packages/javascript/src/types/index.ts b/packages/javascript/src/types/index.ts
index ef0556e..f3354c3 100644
--- a/packages/javascript/src/types/index.ts
+++ b/packages/javascript/src/types/index.ts
@@ -1,5 +1,6 @@
 import type { CatcherMessage } from './catcher-message';
 import type { HawkInitialSettings } from './hawk-initial-settings';
+import type { Transport } from './transport';
 import type { HawkJavaScriptEvent } from './event';
 import type { VueIntegrationData, NuxtIntegrationData, NuxtIntegrationAddons, JavaScriptCatcherIntegrations } from './integrations';
 import type { BreadcrumbsAPI } from './breadcrumbs-api';
@@ -7,6 +8,7 @@ import type { BreadcrumbsAPI } from './breadcrumbs-api';
 export type {
   CatcherMessage,
   HawkInitialSettings,
+  Transport,
   HawkJavaScriptEvent,
   VueIntegrationData,
   NuxtIntegrationData,
diff --git a/packages/javascript/src/types/transport.ts b/packages/javascript/src/types/transport.ts
new file mode 100644
index 0000000..f2237dc
--- /dev/null
+++ b/packages/javascript/src/types/transport.ts
@@ -0,0 +1,8 @@
+import type { CatcherMessage } from './catcher-message';
+
+/**
+ * Transport interface — anything that can send a CatcherMessage
+ */
+export interface Transport {
+  send(message: CatcherMessage): Promise<void>;
+}
diff --git a/packages/javascript/src/utils/selector.ts b/packages/javascript/src/utils/selector.ts
index d886884..f14aedb 100644
--- a/packages/javascript/src/utils/selector.ts
+++ b/packages/javascript/src/utils/selector.ts
@@ -4,13 +4,14 @@
  *
  * @param element - HTML element to build selector from
  * @param maxDepth - Maximum recursion depth (default: 3)
- * @returns CSS selector string (e.g., "div#myId.class1.class2" or ".some-parent button")
+ * @returns {string} CSS selector string (e.g., "div#myId.class1.class2" or ".some-parent button")
  */
 export function buildElementSelector(element: HTMLElement, maxDepth: number = 3): string {
   let selector = element.tagName.toLowerCase();
 
   if (element.id) {
     selector += `#${element.id}`;
+
     return selector;
   }
 
@@ -23,7 +24,9 @@ export function buildElementSelector(element: HTMLElement, maxDepth: number = 3)
     const classNameStr = String(element.className);
 
     if (classNameStr) {
-      selector += `.${classNameStr.split(' ').filter(Boolean).join('.')}`;
+      selector += `.${classNameStr.split(' ').filter(Boolean)
+        .join('.')}`;
+
       return selector;
     }
   }
diff --git a/packages/javascript/src/utils/validation.ts b/packages/javascript/src/utils/validation.ts
index 8db0e0b..c0f9f66 100644
--- a/packages/javascript/src/utils/validation.ts
+++ b/packages/javascript/src/utils/validation.ts
@@ -1,11 +1,11 @@
 import log from './log';
-import type { AffectedUser, EventContext } from '@hawk.so/types';
+import type { AffectedUser, Breadcrumb, EventContext, EventData, JavaScriptAddons } from '@hawk.so/types';
 import Sanitizer from '../modules/sanitizer';
 
 /**
  * Validates user data - basic security checks
  *
- * @param user
+ * @param user - user data to validate
  */
 export function validateUser(user: AffectedUser): boolean {
   if (!user || !Sanitizer.isObject(user)) {
@@ -27,7 +27,7 @@ export function validateUser(user: AffectedUser): boolean {
 /**
  * Validates context data - basic security checks
  *
- * @param context
+ * @param context - context data to validate
  */
 export function validateContext(context: EventContext | undefined): boolean {
   if (context && !Sanitizer.isObject(context)) {
@@ -38,3 +38,57 @@ export function validateContext(context: EventContext | undefined): boolean {
 
   return true;
 }
+
+/**
+ * Checks if value is a plain object (not array, Date, etc.)
+ *
+ * @param value - value to check
+ */
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return Object.prototype.toString.call(value) === '[object Object]';
+}
+
+/**
+ * Runtime check for required EventData fields.
+ * Per @hawk.so/types EventData, `title` is the only non-optional field.
+ * Additionally validates `backtrace` shape if present (must be an array).
+ *
+ * @param payload - value to validate
+ */
+export function isValidEventPayload(payload: unknown): payload is EventData<JavaScriptAddons> {
+  if (!isPlainObject(payload)) {
+    return false;
+  }
+
+  if (typeof payload.title !== 'string' || payload.title.trim() === '') {
+    return false;
+  }
+
+  if (payload.backtrace !== undefined && !Array.isArray(payload.backtrace)) {
+    return false;
+  }
+
+  return true;
+}
+
+/**
+ * Runtime check that value is a valid Breadcrumb-like object.
+ * Must be a plain object with a string message and numeric timestamp.
+ *
+ * @param breadcrumb - value to validate
+ */
+export function isValidBreadcrumb(breadcrumb: unknown): breadcrumb is Breadcrumb {
+  if (!isPlainObject(breadcrumb)) {
+    return false;
+  }
+
+  if (typeof breadcrumb.message !== 'string' || breadcrumb.message.trim() === '') {
+    return false;
+  }
+
+  if (breadcrumb.timestamp !== undefined && typeof breadcrumb.timestamp !== 'number') {
+    return false;
+  }
+
+  return true;
+}
diff --git a/packages/javascript/tests/before-send.test.ts b/packages/javascript/tests/before-send.test.ts
new file mode 100644
index 0000000..e9652a1
--- /dev/null
+++ b/packages/javascript/tests/before-send.test.ts
@@ -0,0 +1,162 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import type { CatcherMessage } from '../src/types/catcher-message';
+import type { Transport } from '../src/types/transport';
+import type { HawkJavaScriptEvent } from '../src/types/event';
+import Catcher from '../src/catcher';
+
+const TEST_TOKEN = 'eyJpbnRlZ3JhdGlvbklkIjoiOTU3MmQyOWQtNWJhZS00YmYyLTkwN2MtZDk5ZDg5MGIwOTVmIiwic2VjcmV0IjoiZTExODFiZWItMjdlMS00ZDViLWEwZmEtZmUwYTM1Mzg5OWMyIn0=';
+/**
+ * Wait for fire-and-forget async calls inside hawk.send() to complete
+ */
+const wait = (): Promise<void> => new Promise((r) => setTimeout(r, 0));
+
+function createTransport() {
+  const sendSpy = vi.fn<(msg: CatcherMessage) => Promise<void>>().mockResolvedValue(undefined);
+  const transport: Transport = { send: sendSpy };
+
+  return { sendSpy, transport };
+}
+
+function getSentPayload(spy: ReturnType<typeof vi.fn>): HawkJavaScriptEvent | null {
+  const calls = spy.mock.calls;
+
+  return calls.length ? calls[calls.length - 1][0].payload : null;
+}
+
+/**
+ * Shared Catcher config — no breadcrumbs, no global handlers, fake transport
+ */
+function createCatcher(transport: Transport, beforeSend: NonNullable<ConstructorParameters<typeof Catcher>[0] extends object ? ConstructorParameters<typeof Catcher>[0]['beforeSend'] : never>) {
+  return new Catcher({
+    token: TEST_TOKEN,
+    disableGlobalErrorsHandling: true,
+    breadcrumbs: false,
+    transport,
+    beforeSend,
+  });
+}
+
+describe('beforeSend', () => {
+  let warnSpy: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
+  });
+
+  afterEach(() => {
+    warnSpy.mockRestore();
+  });
+
+  it('should send event as-is when beforeSend returns it unchanged', async () => {
+    // Arrange
+    const { sendSpy, transport } = createTransport();
+    const hawk = createCatcher(transport, (event) => event);
+
+    // Act
+    hawk.send(new Error('hello'));
+    await wait();
+
+    // Assert
+    expect(sendSpy).toHaveBeenCalledOnce();
+    expect(getSentPayload(sendSpy)!.title).toBe('hello');
+  });
+
+  it('should send modified event when beforeSend mutates and returns it', async () => {
+    // Arrange
+    const { sendSpy, transport } = createTransport();
+    const hawk = createCatcher(transport, (event) => {
+      event.context = { sanitized: true };
+
+      return event;
+    });
+
+    // Act
+    hawk.send(new Error('modify'));
+    await wait();
+
+    // Assert
+    expect(sendSpy).toHaveBeenCalledOnce();
+    expect(getSentPayload(sendSpy)!.context).toEqual({ sanitized: true });
+  });
+
+  it('should not send event when beforeSend returns false', async () => {
+    // Arrange
+    const { sendSpy, transport } = createTransport();
+    const hawk = createCatcher(transport, () => false);
+
+    // Act
+    hawk.send(new Error('drop'));
+    await wait();
+
+    // Assert
+    expect(sendSpy).not.toHaveBeenCalled();
+  });
+
+  it.each([
+    { label: 'undefined', value: undefined },
+    { label: 'null', value: null },
+    { label: 'number (42)', value: 42 },
+    { label: 'string ("oops")', value: 'oops' },
+    { label: 'true', value: true },
+  ])('should send original event and warn when beforeSend returns $label', async ({ value }) => {
+    // Arrange
+    const { sendSpy, transport } = createTransport();
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const hawk = createCatcher(transport, () => value as any);
+
+    // Act
+    hawk.send(new Error('invalid'));
+    await wait();
+
+    // Assert
+    expect(sendSpy).toHaveBeenCalledOnce();
+    expect(getSentPayload(sendSpy)!.title).toBe('invalid');
+    expect(warnSpy).toHaveBeenCalledWith(
+      expect.stringContaining('Invalid beforeSend value'),
+      expect.anything(),
+      expect.anything()
+    );
+  });
+
+  it('should send original event and warn when beforeSend deletes required field (title)', async () => {
+    // Arrange
+    const { sendSpy, transport } = createTransport();
+    const hawk = createCatcher(transport, (event) => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      delete (event as any).title;
+
+      return event;
+    });
+
+    // Act
+    hawk.send(new Error('required-field'));
+    await wait();
+
+    // Assert — fallback to original payload, title preserved
+    expect(sendSpy).toHaveBeenCalledOnce();
+    expect(getSentPayload(sendSpy)!.title).toBe('required-field');
+    expect(warnSpy).toHaveBeenCalledWith(
+      expect.stringContaining('Invalid beforeSend value'),
+      expect.anything(),
+      expect.anything()
+    );
+  });
+
+  it('should send event without deleted optional fields', async () => {
+    // Arrange
+    const { sendSpy, transport } = createTransport();
+    const hawk = createCatcher(transport, (event) => {
+      delete event.release;
+
+      return event;
+    });
+
+    // Act
+    hawk.send(new Error('optional'));
+    await wait();
+
+    // Assert
+    expect(sendSpy).toHaveBeenCalledOnce();
+    expect(getSentPayload(sendSpy)!.release).toBeUndefined();
+  });
+});
diff --git a/packages/javascript/tests/breadcrumbs.test.ts b/packages/javascript/tests/breadcrumbs.test.ts
new file mode 100644
index 0000000..f02d7dc
--- /dev/null
+++ b/packages/javascript/tests/breadcrumbs.test.ts
@@ -0,0 +1,233 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+import { BreadcrumbManager } from '../src/addons/breadcrumbs';
+import type { Breadcrumb } from '@hawk.so/types';
+
+function resetManager(): void {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  (BreadcrumbManager as any).instance = null;
+}
+
+describe('BreadcrumbManager', () => {
+  let warnSpy: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    resetManager();
+    warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
+  });
+
+  afterEach(() => {
+    warnSpy.mockRestore();
+  });
+
+  it('should return empty array when no breadcrumbs added', () => {
+    const m = BreadcrumbManager.getInstance();
+
+    m.init();
+    expect(m.getBreadcrumbs()).toEqual([]);
+  });
+
+  it('should store breadcrumb with auto-generated timestamp', () => {
+    const m = BreadcrumbManager.getInstance();
+
+    m.init();
+    m.addBreadcrumb({ type: 'default', message: 'test', level: 'info' });
+
+    const crumbs = m.getBreadcrumbs();
+
+    expect(crumbs).toHaveLength(1);
+    expect(crumbs[0].message).toBe('test');
+    expect(crumbs[0].timestamp).toBeTypeOf('number');
+  });
+
+  it('should keep explicit timestamp as-is', () => {
+    const m = BreadcrumbManager.getInstance();
+
+    m.init();
+    m.addBreadcrumb({ type: 'default', message: 'test', level: 'info', timestamp: 12345 });
+
+    expect(m.getBreadcrumbs()[0].timestamp).toBe(12345);
+  });
+
+  it('should drop oldest breadcrumbs when buffer overflows (FIFO)', () => {
+    const m = BreadcrumbManager.getInstance();
+
+    m.init({ maxBreadcrumbs: 3 });
+
+    for (let i = 0; i < 5; i++) {
+      m.addBreadcrumb({ type: 'default', message: `msg-${i}`, level: 'info' });
+    }
+
+    const crumbs = m.getBreadcrumbs();
+
+    expect(crumbs).toHaveLength(3);
+    expect(crumbs[0].message).toBe('msg-2');
+    expect(crumbs[2].message).toBe('msg-4');
+  });
+
+  it('should store max 15 breadcrumbs by default', () => {
+    const m = BreadcrumbManager.getInstance();
+
+    m.init();
+
+    for (let i = 0; i < 20; i++) {
+      m.addBreadcrumb({ type: 'default', message: `msg-${i}`, level: 'info' });
+    }
+
+    expect(m.getBreadcrumbs()).toHaveLength(15);
+  });
+
+  it('should empty buffer on clear', () => {
+    const m = BreadcrumbManager.getInstance();
+
+    m.init();
+    m.addBreadcrumb({ type: 'default', message: 'test', level: 'info' });
+    m.clearBreadcrumbs();
+
+    expect(m.getBreadcrumbs()).toEqual([]);
+  });
+
+  it('should return a copy, not the internal array', () => {
+    const m = BreadcrumbManager.getInstance();
+
+    m.init();
+    m.addBreadcrumb({ type: 'default', message: 'test', level: 'info' });
+
+    const first = m.getBreadcrumbs();
+    const second = m.getBreadcrumbs();
+
+    expect(first).not.toBe(second);
+    expect(first).toEqual(second);
+
+    first.push({ type: 'default', message: 'injected', level: 'info', timestamp: 0 } as Breadcrumb);
+
+    expect(m.getBreadcrumbs()).toHaveLength(1);
+  });
+
+  it('should ignore second init call', () => {
+    const m = BreadcrumbManager.getInstance();
+
+    m.init({ maxBreadcrumbs: 5 });
+    m.init({ maxBreadcrumbs: 100 });
+
+    for (let i = 0; i < 10; i++) {
+      m.addBreadcrumb({ type: 'default', message: `msg-${i}`, level: 'info' });
+    }
+
+    expect(m.getBreadcrumbs()).toHaveLength(5);
+  });
+});
+
+describe('beforeBreadcrumb', () => {
+  let warnSpy: ReturnType<typeof vi.spyOn>;
+
+  beforeEach(() => {
+    resetManager();
+    warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
+  });
+
+  afterEach(() => {
+    warnSpy.mockRestore();
+  });
+
+  it('should store modified breadcrumb when hook returns changed object', () => {
+    // Arrange
+    const m = BreadcrumbManager.getInstance();
+
+    m.init({
+      beforeBreadcrumb(bc) {
+        bc.message = 'MODIFIED';
+
+        return bc;
+      },
+    });
+
+    // Act
+    m.addBreadcrumb({ type: 'default', message: 'original', level: 'info' });
+
+    // Assert
+    expect(m.getBreadcrumbs()[0].message).toBe('MODIFIED');
+  });
+
+  it('should not store breadcrumb when hook returns false', () => {
+    // Arrange
+    const m = BreadcrumbManager.getInstance();
+
+    m.init({
+      beforeBreadcrumb: () => false,
+    });
+
+    // Act
+    m.addBreadcrumb({ type: 'default', message: 'drop', level: 'info' });
+
+    // Assert
+    expect(m.getBreadcrumbs()).toHaveLength(0);
+  });
+
+  it.each([
+    { label: 'undefined', value: undefined },
+    { label: 'null', value: null },
+    { label: 'number (42)', value: 42 },
+    { label: 'string ("oops")', value: 'oops' },
+    { label: 'true', value: true },
+  ])('should store original breadcrumb and warn when hook returns $label', ({ value }) => {
+    // Arrange
+    const m = BreadcrumbManager.getInstance();
+
+    m.init({
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      beforeBreadcrumb: () => value as any,
+    });
+
+    // Act
+    m.addBreadcrumb({ type: 'default', message: 'original', level: 'info' });
+
+    // Assert
+    expect(m.getBreadcrumbs()[0].message).toBe('original');
+    expect(warnSpy).toHaveBeenCalledWith(
+      expect.stringContaining('Invalid beforeBreadcrumb value'),
+      expect.anything(),
+      expect.anything()
+    );
+  });
+
+  it('should store original breadcrumb and warn when hook deletes required field (message)', () => {
+    // Arrange
+    const m = BreadcrumbManager.getInstance();
+
+    m.init({
+      beforeBreadcrumb(bc) {
+        // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        delete (bc as any).message;
+
+        return bc;
+      },
+    });
+
+    // Act
+    m.addBreadcrumb({ type: 'default', message: 'keep-me', level: 'info' });
+
+    // Assert — fallback to original, message preserved
+    expect(m.getBreadcrumbs()[0].message).toBe('keep-me');
+  });
+
+  it('should filter breadcrumbs by category using hook', () => {
+    // Arrange
+    const m = BreadcrumbManager.getInstance();
+
+    m.init({
+      beforeBreadcrumb(bc) {
+        return bc.category === 'secret' ? false : bc;
+      },
+    });
+
+    // Act
+    m.addBreadcrumb({ type: 'default', message: 'public', level: 'info', category: 'public' });
+    m.addBreadcrumb({ type: 'default', message: 'secret', level: 'info', category: 'secret' });
+
+    // Assert
+    const crumbs = m.getBreadcrumbs();
+
+    expect(crumbs).toHaveLength(1);
+    expect(crumbs[0].message).toBe('public');
+  });
+});
diff --git a/packages/javascript/tsconfig.test.json b/packages/javascript/tsconfig.test.json
new file mode 100644
index 0000000..166c447
--- /dev/null
+++ b/packages/javascript/tsconfig.test.json
@@ -0,0 +1,12 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": null,
+    "declaration": false
+  },
+  "include": [
+    "src/**/*",
+    "tests/**/*",
+    "vitest.config.ts"
+  ]
+}
diff --git a/packages/javascript/vitest.config.ts b/packages/javascript/vitest.config.ts
new file mode 100644
index 0000000..47ad6a2
--- /dev/null
+++ b/packages/javascript/vitest.config.ts
@@ -0,0 +1,18 @@
+import { defineConfig } from 'vitest/config';
+import path from 'path';
+
+export default defineConfig({
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    include: ['tests/**/*.test.ts'],
+  },
+  define: {
+    VERSION: JSON.stringify('0.0.0-test'),
+  },
+  resolve: {
+    alias: {
+      '@/types': path.resolve(__dirname, './src/types'),
+    },
+  },
+});
diff --git a/yarn.lock b/yarn.lock
index 88bec46..317217e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5,6 +5,46 @@ __metadata:
   version: 8
   cacheKey: 10c0
 
+"@acemir/cssom@npm:^0.9.31":
+  version: 0.9.31
+  resolution: "@acemir/cssom@npm:0.9.31"
+  checksum: 10c0/cbfff98812642104ec3b37de1ad3a53f216ddc437e7b9276a23f46f2453844ea3c3f46c200bc4656a2f747fb26567560b3cc5183d549d119a758926551b5f566
+  languageName: node
+  linkType: hard
+
+"@asamuzakjp/css-color@npm:^4.1.1":
+  version: 4.1.2
+  resolution: "@asamuzakjp/css-color@npm:4.1.2"
+  dependencies:
+    "@csstools/css-calc": "npm:^3.0.0"
+    "@csstools/css-color-parser": "npm:^4.0.1"
+    "@csstools/css-parser-algorithms": "npm:^4.0.0"
+    "@csstools/css-tokenizer": "npm:^4.0.0"
+    lru-cache: "npm:^11.2.5"
+  checksum: 10c0/e432fdef978b37654a2ca31169a149b9173e708f70c82612acb123a36dbc7dd99913c48cbf2edd6fe3652cc627d4bc94bf87571463da0b788f15b973d4ce5b0f
+  languageName: node
+  linkType: hard
+
+"@asamuzakjp/dom-selector@npm:^6.7.6":
+  version: 6.7.8
+  resolution: "@asamuzakjp/dom-selector@npm:6.7.8"
+  dependencies:
+    "@asamuzakjp/nwsapi": "npm:^2.3.9"
+    bidi-js: "npm:^1.0.3"
+    css-tree: "npm:^3.1.0"
+    is-potential-custom-element-name: "npm:^1.0.1"
+    lru-cache: "npm:^11.2.5"
+  checksum: 10c0/4274e5025e6e399654cb066f33a165f4dc65596a33612b0a345dce80666ad1f234b68b8b6db6f005fc76be365ea36e09bd7b08990442461f390c77b19cfea885
+  languageName: node
+  linkType: hard
+
+"@asamuzakjp/nwsapi@npm:^2.3.9":
+  version: 2.3.9
+  resolution: "@asamuzakjp/nwsapi@npm:2.3.9"
+  checksum: 10c0/869b81382e775499c96c45c6dbe0d0766a6da04bcf0abb79f5333535c4e19946851acaa43398f896e2ecc5a1de9cf3db7cf8c4b1afac1ee3d15e21584546d74d
+  languageName: node
+  linkType: hard
+
 "@babel/code-frame@npm:7.12.11":
   version: 7.12.11
   resolution: "@babel/code-frame@npm:7.12.11"
@@ -61,6 +101,59 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@csstools/color-helpers@npm:^6.0.1":
+  version: 6.0.1
+  resolution: "@csstools/color-helpers@npm:6.0.1"
+  checksum: 10c0/866844267d5aa5a02fe9d54f6db6fc18f6306595edb03664cc8ef15c99d3e6f3b42eb1a413c98bafa5b2dc0d8e0193da9b3bcc9d6a04f5de74cbd44935e74b3c
+  languageName: node
+  linkType: hard
+
+"@csstools/css-calc@npm:^3.0.0":
+  version: 3.0.1
+  resolution: "@csstools/css-calc@npm:3.0.1"
+  peerDependencies:
+    "@csstools/css-parser-algorithms": ^4.0.0
+    "@csstools/css-tokenizer": ^4.0.0
+  checksum: 10c0/ccda2b5d78ce6fecce58c59cc5747f5a8db6b5cae9b6d8a38444169d2d6591bf1f5e8bf147e5248e55e28a736e09be26a52621009089987786d69c209df39e0c
+  languageName: node
+  linkType: hard
+
+"@csstools/css-color-parser@npm:^4.0.1":
+  version: 4.0.1
+  resolution: "@csstools/css-color-parser@npm:4.0.1"
+  dependencies:
+    "@csstools/color-helpers": "npm:^6.0.1"
+    "@csstools/css-calc": "npm:^3.0.0"
+  peerDependencies:
+    "@csstools/css-parser-algorithms": ^4.0.0
+    "@csstools/css-tokenizer": ^4.0.0
+  checksum: 10c0/c46be5b9f5c0ef3cd25b47a71bd2a4d1c4856b123ecba4abe8eaa0688d3fc47f58fa67ea281d6b9efca4b9fdfa88fb045c51d0f9b8c612a56bd546d38260b138
+  languageName: node
+  linkType: hard
+
+"@csstools/css-parser-algorithms@npm:^4.0.0":
+  version: 4.0.0
+  resolution: "@csstools/css-parser-algorithms@npm:4.0.0"
+  peerDependencies:
+    "@csstools/css-tokenizer": ^4.0.0
+  checksum: 10c0/94558c2428d6ef0ddef542e86e0a8376aa1263a12a59770abb13ba50d7b83086822c75433f32aa2e7fef00555e1cc88292f9ca5bce79aed232bb3fed73b1528d
+  languageName: node
+  linkType: hard
+
+"@csstools/css-syntax-patches-for-csstree@npm:^1.0.21":
+  version: 1.0.27
+  resolution: "@csstools/css-syntax-patches-for-csstree@npm:1.0.27"
+  checksum: 10c0/ef3f2a639109758c0f3c04520465800ca4c830174bd6f7979795083877c82ace51ab8353857b06a818cb6c0de6d4dc88f84a86fc3b021be47f11a0f1c4b74e7e
+  languageName: node
+  linkType: hard
+
+"@csstools/css-tokenizer@npm:^4.0.0":
+  version: 4.0.0
+  resolution: "@csstools/css-tokenizer@npm:4.0.0"
+  checksum: 10c0/669cf3d0f9c8e1ffdf8c9955ad8beba0c8cfe03197fe29a4fcbd9ee6f7a18856cfa42c62670021a75183d9ab37f5d14a866e6a9df753a6c07f59e36797a9ea9f
+  languageName: node
+  linkType: hard
+
 "@es-joy/jsdoccomment@npm:~0.41.0":
   version: 0.41.0
   resolution: "@es-joy/jsdoccomment@npm:0.41.0"
@@ -471,14 +564,28 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@exodus/bytes@npm:^1.11.0, @exodus/bytes@npm:^1.6.0":
+  version: 1.13.0
+  resolution: "@exodus/bytes@npm:1.13.0"
+  peerDependencies:
+    "@noble/hashes": ^1.8.0 || ^2.0.0
+  peerDependenciesMeta:
+    "@noble/hashes":
+      optional: true
+  checksum: 10c0/f854f2685544c9695f0f92583c65e35ed9f85dff1921ad17de6bf4d24d53075f31ce15a30402a3205958e63ec70211dbf525e97cdd874b157948814f9f2b208d
+  languageName: node
+  linkType: hard
+
 "@hawk.so/javascript@npm:^3.0.0, @hawk.so/javascript@workspace:packages/javascript":
   version: 0.0.0-use.local
   resolution: "@hawk.so/javascript@workspace:packages/javascript"
   dependencies:
-    "@hawk.so/types": "npm:0.5.2"
+    "@hawk.so/types": "npm:0.5.8"
     error-stack-parser: "npm:^2.1.4"
+    jsdom: "npm:^28.0.0"
     vite: "npm:^7.3.1"
     vite-plugin-dts: "npm:^4.2.4"
+    vitest: "npm:^4.0.18"
     vue: "npm:^2"
   languageName: unknown
   linkType: soft
@@ -506,12 +613,12 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@hawk.so/types@npm:0.5.2":
-  version: 0.5.2
-  resolution: "@hawk.so/types@npm:0.5.2"
+"@hawk.so/types@npm:0.5.8":
+  version: 0.5.8
+  resolution: "@hawk.so/types@npm:0.5.8"
   dependencies:
     bson: "npm:^7.0.0"
-  checksum: 10c0/4a76aebc3bc4c87649d4a9991f51c81fac2ad457896ba19261afa66d8979739bed6108db322122400e99b3ca81cb4fbc3be7dee9b7c334d3cbfef51c2ec57719
+  checksum: 10c0/95d45be58594b30aad097d25beb800e2d236cf869b3f57916a67bea841263cab96eecf4d678dd86f94ec46318759b9d566c42228a450c1d05689b3f326654d53
   languageName: node
   linkType: hard
 
@@ -1094,6 +1201,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/chai@npm:^5.2.2":
+  version: 5.2.3
+  resolution: "@types/chai@npm:5.2.3"
+  dependencies:
+    "@types/deep-eql": "npm:*"
+    assertion-error: "npm:^2.0.1"
+  checksum: 10c0/e0ef1de3b6f8045a5e473e867c8565788c444271409d155588504840ad1a53611011f85072188c2833941189400228c1745d78323dac13fcede9c2b28bacfb2f
+  languageName: node
+  linkType: hard
+
 "@types/cookie@npm:^0.6.0":
   version: 0.6.0
   resolution: "@types/cookie@npm:0.6.0"
@@ -1101,6 +1218,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/deep-eql@npm:*":
+  version: 4.0.2
+  resolution: "@types/deep-eql@npm:4.0.2"
+  checksum: 10c0/bf3f811843117900d7084b9d0c852da9a044d12eb40e6de73b552598a6843c21291a8a381b0532644574beecd5e3491c5ff3a0365ab86b15d59862c025384844
+  languageName: node
+  linkType: hard
+
 "@types/estree@npm:1.0.8, @types/estree@npm:^1.0.0, @types/estree@npm:^1.0.5, @types/estree@npm:^1.0.6":
   version: 1.0.8
   resolution: "@types/estree@npm:1.0.8"
@@ -1252,6 +1376,86 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@vitest/expect@npm:4.0.18":
+  version: 4.0.18
+  resolution: "@vitest/expect@npm:4.0.18"
+  dependencies:
+    "@standard-schema/spec": "npm:^1.0.0"
+    "@types/chai": "npm:^5.2.2"
+    "@vitest/spy": "npm:4.0.18"
+    "@vitest/utils": "npm:4.0.18"
+    chai: "npm:^6.2.1"
+    tinyrainbow: "npm:^3.0.3"
+  checksum: 10c0/123b0aa111682e82ec5289186df18037b1a1768700e468ee0f9879709aaa320cf790463c15c0d8ee10df92b402f4394baf5d27797e604d78e674766d87bcaadc
+  languageName: node
+  linkType: hard
+
+"@vitest/mocker@npm:4.0.18":
+  version: 4.0.18
+  resolution: "@vitest/mocker@npm:4.0.18"
+  dependencies:
+    "@vitest/spy": "npm:4.0.18"
+    estree-walker: "npm:^3.0.3"
+    magic-string: "npm:^0.30.21"
+  peerDependencies:
+    msw: ^2.4.9
+    vite: ^6.0.0 || ^7.0.0-0
+  peerDependenciesMeta:
+    msw:
+      optional: true
+    vite:
+      optional: true
+  checksum: 10c0/fb0a257e7e167759d4ad228d53fa7bad2267586459c4a62188f2043dd7163b4b02e1e496dc3c227837f776e7d73d6c4343613e89e7da379d9d30de8260f1ee4b
+  languageName: node
+  linkType: hard
+
+"@vitest/pretty-format@npm:4.0.18":
+  version: 4.0.18
+  resolution: "@vitest/pretty-format@npm:4.0.18"
+  dependencies:
+    tinyrainbow: "npm:^3.0.3"
+  checksum: 10c0/0086b8c88eeca896d8e4b98fcdef452c8041a1b63eb9e85d3e0bcc96c8aa76d8e9e0b6990ebb0bb0a697c4ebab347e7735888b24f507dbff2742ddce7723fd94
+  languageName: node
+  linkType: hard
+
+"@vitest/runner@npm:4.0.18":
+  version: 4.0.18
+  resolution: "@vitest/runner@npm:4.0.18"
+  dependencies:
+    "@vitest/utils": "npm:4.0.18"
+    pathe: "npm:^2.0.3"
+  checksum: 10c0/fdb4afa411475133c05ba266c8092eaf1e56cbd5fb601f92ec6ccb9bab7ca52e06733ee8626599355cba4ee71cb3a8f28c84d3b69dc972e41047edc50229bc01
+  languageName: node
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+"tldts@npm:^7.0.5":
+  version: 7.0.23
+  resolution: "tldts@npm:7.0.23"
+  dependencies:
+    tldts-core: "npm:^7.0.23"
+  bin:
+    tldts: bin/cli.js
+  checksum: 10c0/492874770afaade724a10f8a97cce511d74bed07735c7f1100b7957254d7a5bbbc18becaf5cd049f9d7b0feeb945a64af64d5a300dfb851a4ac57cf3a5998afc
+  languageName: node
+  linkType: hard
+
 "to-regex-range@npm:^5.0.1":
   version: 5.0.1
   resolution: "to-regex-range@npm:5.0.1"
@@ -5352,6 +5796,24 @@ __metadata:
   languageName: node
   linkType: hard
 
+"tough-cookie@npm:^6.0.0":
+  version: 6.0.0
+  resolution: "tough-cookie@npm:6.0.0"
+  dependencies:
+    tldts: "npm:^7.0.5"
+  checksum: 10c0/7b17a461e9c2ac0d0bea13ab57b93b4346d0b8c00db174c963af1e46e4ea8d04148d2a55f2358fc857db0c0c65208a98e319d0c60693e32e0c559a9d9cf20cb5
+  languageName: node
+  linkType: hard
+
+"tr46@npm:^6.0.0":
+  version: 6.0.0
+  resolution: "tr46@npm:6.0.0"
+  dependencies:
+    punycode: "npm:^2.3.1"
+  checksum: 10c0/83130df2f649228aa91c17754b66248030a3af34911d713b5ea417066fa338aa4bc8668d06bd98aa21a2210f43fc0a3db8b9099e7747fb5830e40e39a6a1058e
+  languageName: node
+  linkType: hard
+
 "ts-api-utils@npm:^1.0.1":
   version: 1.4.3
   resolution: "ts-api-utils@npm:1.4.3"
@@ -5501,6 +5963,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"undici@npm:^7.20.0":
+  version: 7.21.0
+  resolution: "undici@npm:7.21.0"
+  checksum: 10c0/ec5d7524125ac9c392a8a67b84fe4f9301936ca6b2afd7be12e73ab98726e55761dc9624ac10361d2f346e6fdaf66043381a62f7d0b565facd61bbfda975a586
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^5.0.0":
   version: 5.0.0
   resolution: "unique-filename@npm:5.0.0"
@@ -5572,7 +6041,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"vite@npm:^7.3.1":
+"vite@npm:^6.0.0 || ^7.0.0, vite@npm:^7.3.1":
   version: 7.3.1
   resolution: "vite@npm:7.3.1"
   dependencies:
@@ -5639,6 +6108,65 @@ __metadata:
   languageName: node
   linkType: hard
 
+"vitest@npm:^4.0.18":
+  version: 4.0.18
+  resolution: "vitest@npm:4.0.18"
+  dependencies:
+    "@vitest/expect": "npm:4.0.18"
+    "@vitest/mocker": "npm:4.0.18"
+    "@vitest/pretty-format": "npm:4.0.18"
+    "@vitest/runner": "npm:4.0.18"
+    "@vitest/snapshot": "npm:4.0.18"
+    "@vitest/spy": "npm:4.0.18"
+    "@vitest/utils": "npm:4.0.18"
+    es-module-lexer: "npm:^1.7.0"
+    expect-type: "npm:^1.2.2"
+    magic-string: "npm:^0.30.21"
+    obug: "npm:^2.1.1"
+    pathe: "npm:^2.0.3"
+    picomatch: "npm:^4.0.3"
+    std-env: "npm:^3.10.0"
+    tinybench: "npm:^2.9.0"
+    tinyexec: "npm:^1.0.2"
+    tinyglobby: "npm:^0.2.15"
+    tinyrainbow: "npm:^3.0.3"
+    vite: "npm:^6.0.0 || ^7.0.0"
+    why-is-node-running: "npm:^2.3.0"
+  peerDependencies:
+    "@edge-runtime/vm": "*"
+    "@opentelemetry/api": ^1.9.0
+    "@types/node": ^20.0.0 || ^22.0.0 || >=24.0.0
+    "@vitest/browser-playwright": 4.0.18
+    "@vitest/browser-preview": 4.0.18
+    "@vitest/browser-webdriverio": 4.0.18
+    "@vitest/ui": 4.0.18
+    happy-dom: "*"
+    jsdom: "*"
+  peerDependenciesMeta:
+    "@edge-runtime/vm":
+      optional: true
+    "@opentelemetry/api":
+      optional: true
+    "@types/node":
+      optional: true
+    "@vitest/browser-playwright":
+      optional: true
+    "@vitest/browser-preview":
+      optional: true
+    "@vitest/browser-webdriverio":
+      optional: true
+    "@vitest/ui":
+      optional: true
+    happy-dom:
+      optional: true
+    jsdom:
+      optional: true
+  bin:
+    vitest: vitest.mjs
+  checksum: 10c0/b913cd32032c95f29ff08c931f4b4c6fd6d2da498908d6770952c561a1b8d75c62499a1f04cadf82fb89cc0f9a33f29fb5dfdb899f6dbb27686a9d91571be5fa
+  languageName: node
+  linkType: hard
+
 "vscode-uri@npm:^3.0.8":
   version: 3.1.0
   resolution: "vscode-uri@npm:3.1.0"
@@ -5656,6 +6184,40 @@ __metadata:
   languageName: node
   linkType: hard
 
+"w3c-xmlserializer@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "w3c-xmlserializer@npm:5.0.0"
+  dependencies:
+    xml-name-validator: "npm:^5.0.0"
+  checksum: 10c0/8712774c1aeb62dec22928bf1cdfd11426c2c9383a1a63f2bcae18db87ca574165a0fbe96b312b73652149167ac6c7f4cf5409f2eb101d9c805efe0e4bae798b
+  languageName: node
+  linkType: hard
+
+"webidl-conversions@npm:^8.0.1":
+  version: 8.0.1
+  resolution: "webidl-conversions@npm:8.0.1"
+  checksum: 10c0/3f6f327ca5fa0c065ed8ed0ef3b72f33623376e68f958e9b7bd0df49fdb0b908139ac2338d19fb45bd0e05595bda96cb6d1622222a8b413daa38a17aacc4dd46
+  languageName: node
+  linkType: hard
+
+"whatwg-mimetype@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "whatwg-mimetype@npm:5.0.0"
+  checksum: 10c0/eead164fe73a00dd82f817af6fc0bd22e9c273e1d55bf4bc6bdf2da7ad8127fca82ef00ea6a37892f5f5641f8e34128e09508f92126086baba126b9e0d57feb4
+  languageName: node
+  linkType: hard
+
+"whatwg-url@npm:^16.0.0":
+  version: 16.0.0
+  resolution: "whatwg-url@npm:16.0.0"
+  dependencies:
+    "@exodus/bytes": "npm:^1.11.0"
+    tr46: "npm:^6.0.0"
+    webidl-conversions: "npm:^8.0.1"
+  checksum: 10c0/9b8cb392be244d0e9687ffe543f9ea63b7aa051a98547ea362a38d182d89bfbd96e13e7ed3f40df1f7566bb7c3581f6c081ddea950cf5382532716ce33000ff4
+  languageName: node
+  linkType: hard
+
 "which-boxed-primitive@npm:^1.1.0, which-boxed-primitive@npm:^1.1.1":
   version: 1.1.1
   resolution: "which-boxed-primitive@npm:1.1.1"
@@ -5739,6 +6301,18 @@ __metadata:
   languageName: node
   linkType: hard
 
+"why-is-node-running@npm:^2.3.0":
+  version: 2.3.0
+  resolution: "why-is-node-running@npm:2.3.0"
+  dependencies:
+    siginfo: "npm:^2.0.0"
+    stackback: "npm:0.0.2"
+  bin:
+    why-is-node-running: cli.js
+  checksum: 10c0/1cde0b01b827d2cf4cb11db962f3958b9175d5d9e7ac7361d1a7b0e2dc6069a263e69118bd974c4f6d0a890ef4eedfe34cf3d5167ec14203dbc9a18620537054
+  languageName: node
+  linkType: hard
+
 "word-wrap@npm:^1.2.5":
   version: 1.2.5
   resolution: "word-wrap@npm:1.2.5"
@@ -5753,6 +6327,20 @@ __metadata:
   languageName: node
   linkType: hard
 
+"xml-name-validator@npm:^5.0.0":
+  version: 5.0.0
+  resolution: "xml-name-validator@npm:5.0.0"
+  checksum: 10c0/3fcf44e7b73fb18be917fdd4ccffff3639373c7cb83f8fc35df6001fecba7942f1dbead29d91ebb8315e2f2ff786b508f0c9dc0215b6353f9983c6b7d62cb1f5
+  languageName: node
+  linkType: hard
+
+"xmlchars@npm:^2.2.0":
+  version: 2.2.0
+  resolution: "xmlchars@npm:2.2.0"
+  checksum: 10c0/b64b535861a6f310c5d9bfa10834cf49127c71922c297da9d4d1b45eeaae40bf9b4363275876088fbe2667e5db028d2cd4f8ee72eed9bede840a67d57dab7593
+  languageName: node
+  linkType: hard
+
 "yallist@npm:^4.0.0":
   version: 4.0.0
   resolution: "yallist@npm:4.0.0"