getsentry · harshit078 · Jan 14, 2026 · Jan 14, 2026 · Jan 14, 2026 · Jan 14, 2026
diff --git a/dev-packages/browser-integration-tests/suites/wasm/webWorker/assets/worker.js b/dev-packages/browser-integration-tests/suites/wasm/webWorker/assets/worker.js
@@ -0,0 +1,86 @@
+// This worker manually just replicates what the actual Sentry.registerWebWorkerWasm() does
+
+const origInstantiateStreaming = WebAssembly.instantiateStreaming;
+WebAssembly.instantiateStreaming = function instantiateStreaming(response, importObject) {
+  return Promise.resolve(response).then(res => {
+    return origInstantiateStreaming(res, importObject).then(rv => {
+      if (res.url) {
+        registerModuleAndForward(rv.module, res.url);
+      }
+      return rv;
+    });
+  });
+};
+
+function registerModuleAndForward(module, url) {
+  const buildId = getBuildId(module);
+
+  if (buildId) {
+    const image = {
+      type: 'wasm',
+      code_id: buildId,
+      code_file: url,
+      debug_file: null,
+      debug_id: (buildId + '00000000000000000000000000000000').slice(0, 32) + '0',
+    };
+
+    self.postMessage({
+      _sentryMessage: true,
+      _sentryWasmImages: [image],
+    });
+  }
+}
+
+// Extract build ID from WASM module
+function getBuildId(module) {
+  const sections = WebAssembly.Module.customSections(module, 'build_id');
+  if (sections.length > 0) {
+    const buildId = Array.from(new Uint8Array(sections[0]))
+      .map(b => b.toString(16).padStart(2, '0'))
+      .join('');
+    return buildId;
+  }
+  return null;
+}
+
+// Handle messages from the main thread
+self.addEventListener('message', async event => {
+  if (event.data.type === 'load-wasm-and-crash') {
+    const wasmUrl = event.data.wasmUrl;
+
+    function crash() {
+      throw new Error('WASM error from worker');
+    }
+
+    try {
+      const { instance } = await WebAssembly.instantiateStreaming(fetch(wasmUrl), {
+        env: {
+          external_func: crash,
+        },
+      });
+
+      instance.exports.internal_func();
+    } catch (err) {
+      self.postMessage({
+        _sentryMessage: true,
+        _sentryWorkerError: {
+          reason: err,
+          filename: self.location.href,
+        },
+      });
+    }
+  }
+});
+
+self.addEventListener('unhandledrejection', event => {
+  self.postMessage({
+    _sentryMessage: true,
+    _sentryWorkerError: {
+      reason: event.reason,
+      filename: self.location.href,
+    },
+  });
+});
+
+// Let the main thread know that worker is ready
+self.postMessage({ _sentryMessage: false, type: 'WORKER_READY' });
diff --git a/dev-packages/browser-integration-tests/suites/wasm/webWorker/init.js b/dev-packages/browser-integration-tests/suites/wasm/webWorker/init.js
@@ -0,0 +1,15 @@
+import * as Sentry from '@sentry/browser';
+import { wasmIntegration } from '@sentry/wasm';
+
+window.Sentry = Sentry;
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  integrations: [wasmIntegration({ applicationKey: 'wasm-worker-app' })],
+});
+
+const worker = new Worker('/worker.js');
+
+Sentry.addIntegration(Sentry.webWorkerIntegration({ worker }));
+
+window.wasmWorker = worker;
diff --git a/dev-packages/browser-integration-tests/suites/wasm/webWorker/subject.js b/dev-packages/browser-integration-tests/suites/wasm/webWorker/subject.js
@@ -0,0 +1,8 @@
+window.events = [];
+
+window.triggerWasmError = () => {
+  window.wasmWorker.postMessage({
+    type: 'load-wasm-and-crash',
+    wasmUrl: 'https://localhost:5887/simple.wasm',
+  });
+};
diff --git a/dev-packages/browser-integration-tests/suites/wasm/webWorker/template.html b/dev-packages/browser-integration-tests/suites/wasm/webWorker/template.html
@@ -0,0 +1,9 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+  </head>
+  <body>
+    <button id="triggerWasmError">Trigger WASM Error in Worker</button>
+  </body>
+</html>
diff --git a/dev-packages/browser-integration-tests/suites/wasm/webWorker/test.ts b/dev-packages/browser-integration-tests/suites/wasm/webWorker/test.ts
@@ -0,0 +1,138 @@
+import { expect } from '@playwright/test';
+import fs from 'fs';
+import path from 'path';
+import { sentryTest } from '../../../utils/fixtures';
+import { envelopeRequestParser, waitForErrorRequest } from '../../../utils/helpers';
+import { shouldSkipWASMTests } from '../../../utils/wasmHelpers';
+
+declare global {
+  interface Window {
+    wasmWorker: Worker;
+    triggerWasmError: () => void;
+  }
+}
+
+const bundle = process.env.PW_BUNDLE || '';
+if (bundle.startsWith('bundle')) {
+  sentryTest.skip();
+}
+
+sentryTest(
+  'WASM debug images from worker should be forwarded to main thread and attached to events',
+  async ({ getLocalTestUrl, page, browserName }) => {
+    if (shouldSkipWASMTests(browserName)) {
+      sentryTest.skip();
+    }
+
+    const url = await getLocalTestUrl({ testDir: __dirname });
+
+    await page.route('**/simple.wasm', route => {
+      const wasmModule = fs.readFileSync(path.resolve(__dirname, '../simple.wasm'));
+      return route.fulfill({
+        status: 200,
+        body: wasmModule,
+        headers: {
+          'Content-Type': 'application/wasm',
+        },
+      });
+    });
+
+    await page.route('**/worker.js', route => {
+      return route.fulfill({
+        path: `${__dirname}/assets/worker.js`,
+      });
+    });
+
+    const errorEventPromise = waitForErrorRequest(page, e => {
+      return e.exception?.values?.[0]?.value === 'WASM error from worker';
+    });
+
+    await page.goto(url);
+
+    await page.waitForFunction(() => window.wasmWorker !== undefined);
+
+    await page.evaluate(() => {
+      window.triggerWasmError();
+    });
+
+    const errorEvent = envelopeRequestParser(await errorEventPromise);
+
+    expect(errorEvent.exception?.values?.[0]?.value).toBe('WASM error from worker');
+
+    expect(errorEvent.debug_meta?.images).toBeDefined();
+    expect(errorEvent.debug_meta?.images).toEqual(
+      expect.arrayContaining([
+        expect.objectContaining({
+          type: 'wasm',
+          code_file: expect.stringMatching(/simple\.wasm$/),
+          code_id: '0ba020cdd2444f7eafdd25999a8e9010',
+          debug_id: '0ba020cdd2444f7eafdd25999a8e90100',
+        }),
+      ]),
+    );
+
+    const wasmFrame = errorEvent.exception?.values?.[0]?.stacktrace?.frames?.find(
+      frame => frame.filename && frame.filename.includes('simple.wasm'),
+    );
+
+    if (wasmFrame) {
+      expect(wasmFrame.platform).toBe('native');
+      expect(wasmFrame.instruction_addr).toBeDefined();
+      expect(wasmFrame.addr_mode).toMatch(/^rel:\d+$/);
+    }
+  },
+);
+
+sentryTest(
+  'WASM frames from worker should be recognized as first-party when applicationKey is configured',
+  async ({ getLocalTestUrl, page, browserName }) => {
+    if (shouldSkipWASMTests(browserName)) {
+      sentryTest.skip();
+    }
+
+    const url = await getLocalTestUrl({ testDir: __dirname });
+
+    await page.route('**/simple.wasm', route => {
+      const wasmModule = fs.readFileSync(path.resolve(__dirname, '../simple.wasm'));
+      return route.fulfill({
+        status: 200,
+        body: wasmModule,
+        headers: {
+          'Content-Type': 'application/wasm',
+        },
+      });
+    });
+
+    await page.route('**/worker.js', route => {
+      return route.fulfill({
+        path: `${__dirname}/assets/worker.js`,
+      });
+    });
+
+    const errorEventPromise = waitForErrorRequest(page, e => {
+      return e.exception?.values?.[0]?.value === 'WASM error from worker';
+    });
+
+    await page.goto(url);
+
+    await page.waitForFunction(() => window.wasmWorker !== undefined);
+
+    await page.evaluate(() => {
+      window.triggerWasmError();
+    });
+
+    const errorEvent = envelopeRequestParser(await errorEventPromise);
+
+    const wasmFrame = errorEvent.exception?.values?.[0]?.stacktrace?.frames?.find(
+      frame => frame.filename && frame.filename.includes('simple.wasm'),
+    );
+
+    if (wasmFrame) {
+      expect(wasmFrame.module_metadata).toEqual(
+        expect.objectContaining({
+          '_sentryBundlerPluginAppKey:wasm-worker-app': true,
+        }),
+      );
+    }
+  },
+);
diff --git a/packages/browser/src/integrations/webWorker.ts b/packages/browser/src/integrations/webWorker.ts
@@ -1,4 +1,4 @@
-import type { Integration, IntegrationFn } from '@sentry/core';
+import type { DebugImage, Integration, IntegrationFn } from '@sentry/core';
 import { captureEvent, debug, defineIntegration, getClient, isPlainObject, isPrimitive } from '@sentry/core';
 import { DEBUG_BUILD } from '../debug-build';
 import { eventFromUnknownInput } from '../eventbuilder';
@@ -12,6 +12,7 @@ interface WebWorkerMessage {
   _sentryDebugIds?: Record<string, string>;
   _sentryModuleMetadata?: Record<string, any>; // eslint-disable-line @typescript-eslint/no-explicit-any
   _sentryWorkerError?: SerializedWorkerError;
+  _sentryWasmImages?: Array<DebugImage>;
 }
 
 interface SerializedWorkerError {
@@ -135,6 +136,23 @@ function listenForSentryMessages(worker: Worker): void {
         };
       }
 
+      // Handle WASM images from worker
+      if (event.data._sentryWasmImages) {
+        DEBUG_BUILD && debug.log('Sentry WASM images web worker message received', event.data);
+        const existingImages =
+          (WINDOW as typeof WINDOW & { _sentryWasmImages?: Array<DebugImage> })._sentryWasmImages || [];
+        const newImages = event.data._sentryWasmImages.filter(
+          (newImg: unknown) =>
+            isPlainObject(newImg) &&
+            typeof newImg.code_file === 'string' &&
+            !existingImages.some(existing => existing.code_file === newImg.code_file),
+        );
+        (WINDOW as typeof WINDOW & { _sentryWasmImages?: Array<DebugImage> })._sentryWasmImages = [
+          ...existingImages,
+          ...(newImages as Array<DebugImage>),
+        ];
+      }
+
       // Handle unhandled rejections forwarded from worker
       if (event.data._sentryWorkerError) {
         DEBUG_BUILD && debug.log('Sentry worker rejection message received', event.data._sentryWorkerError);
@@ -270,12 +288,13 @@ function isSentryMessage(eventData: unknown): eventData is WebWorkerMessage {
     return false;
   }
 
-  // Must have at least one of: debug IDs, module metadata, or worker error
+  // Must have at least one of: debug IDs, module metadata, worker error, or WASM images
   const hasDebugIds = '_sentryDebugIds' in eventData;
   const hasModuleMetadata = '_sentryModuleMetadata' in eventData;
   const hasWorkerError = '_sentryWorkerError' in eventData;
+  const hasWasmImages = '_sentryWasmImages' in eventData;
 
-  if (!hasDebugIds && !hasModuleMetadata && !hasWorkerError) {
+  if (!hasDebugIds && !hasModuleMetadata && !hasWorkerError && !hasWasmImages) {
     return false;
   }
 
@@ -297,5 +316,16 @@ function isSentryMessage(eventData: unknown): eventData is WebWorkerMessage {
     return false;
   }
 
+  // Validate WASM images if present
+  if (
+    hasWasmImages &&
+    (!Array.isArray(eventData._sentryWasmImages) ||
+      !eventData._sentryWasmImages.every(
+        (img: unknown) => isPlainObject(img) && typeof (img as { code_file?: unknown }).code_file === 'string',
+      ))
+  ) {
+    return false;
+  }
+
   return true;
 }