feat(core): Add ModuleMetadata integration (#8475)

- Adds the `ModuleMetadata` integration that fetches metadata injected via bundler plugins and attaches is to the `module_metadata` property of every `StackFrame`. 
  - This can later be used in `beforeSend` or another integration to route events depending on the metadata.
  - This integration is 
    - Exported separately from `@sentry/core` (ie. not in `Integrations`) so it doesn't get included in default bundles
    - Exported separately from `@sentry/browser` so that it can be used without depending directly on core
- Uses the `beforeEnvelope` hook to strip the `module_metadata` property from stack frames
- Adds a test to ensure `module_metadata` is available in `beforeSend` and is stripped before sending

packages/browser/src/index.ts

@@ -34,6 +34,7 @@ export {
   spanStatusfromHttpCode,
   trace,
   makeMultiplexedTransport,
+  ModuleMetadata,
 } from '@sentry/core';
 export type { SpanStatusType } from '@sentry/core';
 export type { Span } from '@sentry/types';

packages/core/src/index.ts

@@ -46,7 +46,7 @@ export { prepareEvent } from './utils/prepareEvent';
 export { createCheckInEnvelope } from './checkin';
 export { hasTracingEnabled } from './utils/hasTracingEnabled';
 export { DEFAULT_ENVIRONMENT } from './constants';
-
+export { ModuleMetadata } from './integrations/metadata';
 import * as Integrations from './integrations';
 
 export { Integrations };

packages/core/src/integrations/metadata.ts

@@ -0,0 +1,57 @@
+import type { EventItem, EventProcessor, Hub, Integration } from '@sentry/types';
+import { forEachEnvelopeItem } from '@sentry/utils';
+
+import { addMetadataToStackFrames, stripMetadataFromStackFrames } from '../metadata';
+
+/**
+ * Adds module metadata to stack frames.
+ *
+ * Metadata can be injected by the Sentry bundler plugins using the `_experiments.moduleMetadata` config option.
+ *
+ * When this integration is added, the metadata passed to the bundler plugin is added to the stack frames of all events
+ * under the `module_metadata` property. This can be used to help in tagging or routing of events from different teams
+ * our sources
+ */
+export class ModuleMetadata implements Integration {
+  /*
+   * @inheritDoc
+   */
+  public static id: string = 'ModuleMetadata';
+
+  /**
+   * @inheritDoc
+   */
+  public name: string = ModuleMetadata.id;
+
+  /**
+   * @inheritDoc
+   */
+  public setupOnce(addGlobalEventProcessor: (processor: EventProcessor) => void, getCurrentHub: () => Hub): void {
+    const client = getCurrentHub().getClient();
+
+    if (!client || typeof client.on !== 'function') {
+      return;
+    }
+
+    // We need to strip metadata from stack frames before sending them to Sentry since these are client side only.
+    client.on('beforeEnvelope', envelope => {
+      forEachEnvelopeItem(envelope, (item, type) => {
+        if (type === 'event') {
+          const event = Array.isArray(item) ? (item as EventItem)[1] : undefined;
+
+          if (event) {
+            stripMetadataFromStackFrames(event);
+            item[1] = event;
+          }
+        }
+      });
+    });
+
+    const stackParser = client.getOptions().stackParser;
+
+    addGlobalEventProcessor(event => {
+      addMetadataToStackFrames(stackParser, event);
+      return event;
+    });
+  }
+}

packages/core/test/lib/integrations/metadata.test.ts

@@ -0,0 +1,66 @@
+import type { Event } from '@sentry/types';
+import { createStackParser, GLOBAL_OBJ, nodeStackLineParser, parseEnvelope } from '@sentry/utils';
+import { TextDecoder, TextEncoder } from 'util';
+
+import { createTransport, getCurrentHub, ModuleMetadata } from '../../../src';
+import { getDefaultTestClientOptions, TestClient } from '../../mocks/client';
+
+const stackParser = createStackParser(nodeStackLineParser());
+
+const stack = new Error().stack || '';
+
+describe('ModuleMetadata integration', () => {
+  beforeEach(() => {
+    TestClient.sendEventCalled = undefined;
+    TestClient.instance = undefined;
+
+    GLOBAL_OBJ._sentryModuleMetadata = GLOBAL_OBJ._sentryModuleMetadata || {};
+    GLOBAL_OBJ._sentryModuleMetadata[stack] = { team: 'frontend' };
+  });
+
+  afterEach(() => {
+    jest.clearAllMocks();
+  });
+
+  test('Adds and removes metadata from stack frames', done => {
+    const options = getDefaultTestClientOptions({
+      dsn: 'https://username@domain/123',
+      enableSend: true,
+      stackParser,
+      integrations: [new ModuleMetadata()],
+      beforeSend: (event, _hint) => {
+        // copy the frames since reverse in in-place
+        const lastFrame = [...(event.exception?.values?.[0].stacktrace?.frames || [])].reverse()[0];
+        // Ensure module_metadata is populated in beforeSend callback
+        expect(lastFrame?.module_metadata).toEqual({ team: 'frontend' });
+        return event;
+      },
+      transport: () =>
+        createTransport({ recordDroppedEvent: () => undefined, textEncoder: new TextEncoder() }, async req => {
+          const [, items] = parseEnvelope(req.body, new TextEncoder(), new TextDecoder());
+
+          expect(items[0][1]).toBeDefined();
+          const event = items[0][1] as Event;
+          const error = event.exception?.values?.[0];
+
+          // Ensure we're looking at the same error we threw
+          expect(error?.value).toEqual('Some error');
+
+          const lastFrame = [...(error?.stacktrace?.frames || [])].reverse()[0];
+          // Ensure the last frame is in fact for this file
+          expect(lastFrame?.filename).toEqual(__filename);
+
+          // Ensure module_metadata has been stripped from the event
+          expect(lastFrame?.module_metadata).toBeUndefined();
+
+          done();
+          return {};
+        }),
+    });
+
+    const client = new TestClient(options);
+    const hub = getCurrentHub();
+    hub.bindClient(client);
+    hub.captureException(new Error('Some error'));
+  });
+});

packages/core/test/mocks/client.ts

@@ -54,7 +54,7 @@ export class TestClient extends BaseClient<TestClientOptions> {
 
   // eslint-disable-next-line @typescript-eslint/no-explicit-any, @typescript-eslint/explicit-module-boundary-types
   public eventFromException(exception: any): PromiseLike<Event> {
-    return resolvedSyncPromise({
+    const event: Event = {
       exception: {
         values: [
           {
@@ -65,7 +65,14 @@ export class TestClient extends BaseClient<TestClientOptions> {
           },
         ],
       },
-    });
+    };
+
+    const frames = this._options.stackParser(exception.stack || '', 1);
+    if (frames.length && event?.exception?.values?.[0]) {
+      event.exception.values[0] = { ...event.exception.values[0], stacktrace: { frames } };
+    }
+
+    return resolvedSyncPromise(event);
   }
 
   public eventFromMessage(