Support basic error exporting

packages/app/src/constants.ts

@@ -41,6 +41,7 @@ import { name as storageCompatName } from '../../../packages/storage-compat/pack
 import { name as firestoreName } from '../../../packages/firestore/package.json';
 import { name as aiName } from '../../../packages/ai/package.json';
 import { name as firestoreCompatName } from '../../../packages/firestore-compat/package.json';
+import { name as telemetryName } from '../../../packages/telemetry/package.json';
 import { name as packageName } from '../../../packages/firebase/package.json';
 
 /**
@@ -74,6 +75,7 @@ export const PLATFORM_LOG_STRING = {
   [remoteConfigCompatName]: 'fire-rc-compat',
   [storageName]: 'fire-gcs',
   [storageCompatName]: 'fire-gcs-compat',
+  [telemetryName]: 'fire-telemetry',
   [firestoreName]: 'fire-fst',
   [firestoreCompatName]: 'fire-fst-compat',
   [aiName]: 'fire-vertex',

packages/telemetry/package.json

@@ -42,8 +42,13 @@
     "@firebase/app-types": "0.x"
   },
   "dependencies": {
-    "tslib": "^2.1.0",
-    "@firebase/component": "0.7.0"
+    "@firebase/component": "0.7.0",
+    "@opentelemetry/api-logs": "0.203.0",
+    "@opentelemetry/exporter-logs-otlp-http": "0.203.0",
+    "@opentelemetry/resources": "2.0.1",
+    "@opentelemetry/sdk-logs": "0.203.0",
+    "@opentelemetry/semantic-conventions": "1.36.0",
+    "tslib": "^2.1.0"
   },
   "license": "Apache-2.0",
   "devDependencies": {

packages/telemetry/src/api.test.ts

@@ -0,0 +1,126 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { expect } from 'chai';
+import { LoggerProvider } from '@opentelemetry/sdk-logs';
+import { Telemetry } from './public-types';
+import { Logger, LogRecord, SeverityNumber } from '@opentelemetry/api-logs';
+import { captureError, flush } from './api';
+
+const emittedLogs: LogRecord[] = [];
+
+const fakeLoggerProvider = {
+  getLogger: (): Logger => {
+    return {
+      emit: (logRecord: LogRecord) => {
+        emittedLogs.push(logRecord);
+      }
+    };
+  },
+  forceFlush: () => {
+    emittedLogs.length = 0;
+    return Promise.resolve();
+  },
+  shutdown: () => Promise.resolve()
+} as unknown as LoggerProvider;
+
+const fakeTelemetry: Telemetry = {
+  app: {
+    name: 'DEFAULT',
+    automaticDataCollectionEnabled: true,
+    options: {
+      projectId: 'my-project',
+      appId: 'my-appid'
+    }
+  },
+  loggerProvider: fakeLoggerProvider
+};
+
+describe('Top level API', () => {
+  beforeEach(() => {
+    // Clear the logs before each test.
+    emittedLogs.length = 0;
+  });
+
+  describe('captureError()', () => {
+    it('should capture an Error object correctly', () => {
+      const error = new Error('This is a test error');
+      error.stack = '...stack trace...';
+      error.name = 'TestError';
+
+      captureError(fakeTelemetry, error);
+
+      expect(emittedLogs.length).to.equal(1);
+      const log = emittedLogs[0];
+      expect(log.severityNumber).to.equal(SeverityNumber.ERROR);
+      expect(log.body).to.equal('This is a test error');
+      expect(log.attributes).to.deep.equal({
+        'error.type': 'TestError',
+        'error.stack': '...stack trace...'
+      });
+    });
+
+    it('should handle an Error object with no stack trace', () => {
+      const error = new Error('error with no stack');
+      error.stack = undefined;
+
+      captureError(fakeTelemetry, error);
+
+      expect(emittedLogs.length).to.equal(1);
+      const log = emittedLogs[0];
+      expect(log.severityNumber).to.equal(SeverityNumber.ERROR);
+      expect(log.body).to.equal('error with no stack');
+      expect(log.attributes).to.deep.equal({
+        'error.type': 'Error',
+        'error.stack': 'No stack trace available'
+      });
+    });
+
+    it('should capture a string error correctly', () => {
+      captureError(fakeTelemetry, 'a string error');
+
+      expect(emittedLogs.length).to.equal(1);
+      const log = emittedLogs[0];
+      expect(log.severityNumber).to.equal(SeverityNumber.ERROR);
+      expect(log.body).to.equal('a string error');
+      expect(log.attributes).to.be.undefined;
+    });
+
+    it('should capture an unknown error type correctly', () => {
+      captureError(fakeTelemetry, 12345);
+
+      expect(emittedLogs.length).to.equal(1);
+      const log = emittedLogs[0];
+      expect(log.severityNumber).to.equal(SeverityNumber.ERROR);
+      expect(log.body).to.equal('Unknown error type: number');
+      expect(log.attributes).to.be.undefined;
+    });
+  });
+
+  describe('flush()', () => {
+    it('should flush logs correctly', async () => {
+      captureError(fakeTelemetry, 'error1');
+      captureError(fakeTelemetry, 'error2');
+
+      expect(emittedLogs.length).to.equal(2);
+
+      await flush(fakeTelemetry);
+
+      expect(emittedLogs.length).to.equal(0);
+    });
+  });
+});

packages/telemetry/src/api.ts

@@ -19,6 +19,14 @@ import { _getProvider, FirebaseApp, getApp } from '@firebase/app';
 import { TELEMETRY_TYPE } from './constants';
 import { Telemetry } from './public-types';
 import { Provider } from '@firebase/component';
+import { SeverityNumber } from '@opentelemetry/api-logs';
+import { TelemetryService } from './service';
+
+declare module '@firebase/component' {
+  interface NameServiceMapping {
+    [TELEMETRY_TYPE]: TelemetryService;
+  }
+}
 
 /**
  * Returns the default {@link Telemetry} instance that is associated with the provided
@@ -44,3 +52,49 @@ export function getTelemetry(app: FirebaseApp = getApp()): Telemetry {
 
   return telemetryProvider.getImmediate();
 }
+
+/**
+ * Enqueues an error to be uploaded to the Firebase Telemetry API.
+ *
+ * @public
+ *
+ * @param telemetry - The {@link Telemetry} instance.
+ * @param error - the caught exception, typically an {@link Error}
+ */
+export function captureError(telemetry: Telemetry, error: unknown): void {
+  const logger = telemetry.loggerProvider.getLogger('error-logger');
+  if (error instanceof Error) {
+    logger.emit({
+      severityNumber: SeverityNumber.ERROR,
+      body: error.message,
+      attributes: {
+        'error.type': error.name || 'Error',
+        'error.stack': error.stack || 'No stack trace available'
+      }
+    });
+  } else if (typeof error === 'string') {
+    logger.emit({
+      severityNumber: SeverityNumber.ERROR,
+      body: error
+    });
+  } else {
+    logger.emit({
+      severityNumber: SeverityNumber.ERROR,
+      body: `Unknown error type: ${typeof error}`
+    });
+  }
+}
+
+/**
+ * Flushes all enqueued telemetry data immediately.
+ *
+ * @public
+ *
+ * @param telemetry - The {@link Telemetry} instance.
+ * @returns a promise which is resolved when all flushes are complete
+ */
+export function flush(telemetry: Telemetry): Promise<void> {
+  return telemetry.loggerProvider.forceFlush().catch(err => {
+    console.error('Error flushing logs from Firebase Telemetry:', err);
+  });
+}

packages/telemetry/src/helpers.ts

@@ -0,0 +1,45 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {
+  LoggerProvider,
+  BatchLogRecordProcessor
+} from '@opentelemetry/sdk-logs';
+import { ATTR_SERVICE_NAME } from '@opentelemetry/semantic-conventions';
+import { resourceFromAttributes } from '@opentelemetry/resources';
+import { OTLPLogExporter } from '@opentelemetry/exporter-logs-otlp-http';
+
+/**
+ * Create default logger provider.
+ *
+ * @internal
+ */
+export function createLoggerProvider(): LoggerProvider {
+  const resource = resourceFromAttributes({
+    [ATTR_SERVICE_NAME]: 'firebase_telemetry_service'
+  });
+
+  const otlpEndpoint = process.env.OTEL_ENDPOINT;
+
+  const logExporter = new OTLPLogExporter({
+    url: `${otlpEndpoint}/api/v1/logs`
+  });
+  return new LoggerProvider({
+    resource,
+    processors: [new BatchLogRecordProcessor(logExporter)]
+  });
+}

packages/telemetry/src/index.node.ts

@@ -16,23 +16,11 @@
  */
 
 import { _registerComponent, registerVersion } from '@firebase/app';
-import { TestType } from './types/index';
 import { Component, ComponentType } from '@firebase/component';
 import { TELEMETRY_TYPE } from './constants';
 import { name, version } from '../package.json';
 import { TelemetryService } from './service';
-
-export function testFxn(): number {
-  const _thing: TestType = {};
-  console.log('hi');
-  return 42;
-}
-
-declare module '@firebase/component' {
-  interface NameServiceMapping {
-    [TELEMETRY_TYPE]: TelemetryService;
-  }
-}
+import { createLoggerProvider } from './helpers';
 
 export function registerTelemetry(): void {
   _registerComponent(
@@ -41,7 +29,9 @@ export function registerTelemetry(): void {
       container => {
         // getImmediate for FirebaseApp will always succeed
         const app = container.getProvider('app').getImmediate();
-        return new TelemetryService(app);
+        const loggerProvider = createLoggerProvider();
+
+        return new TelemetryService(app, loggerProvider);
       },
       ComponentType.PUBLIC
     )

packages/telemetry/src/index.ts

@@ -16,23 +16,11 @@
  */
 
 import { _registerComponent, registerVersion } from '@firebase/app';
-import { TestType } from './types/index';
 import { Component, ComponentType } from '@firebase/component';
 import { TELEMETRY_TYPE } from './constants';
 import { name, version } from '../package.json';
 import { TelemetryService } from './service';
-
-export function testFxn(): number {
-  const _thing: TestType = {};
-  console.log('hi');
-  return 42;
-}
-
-declare module '@firebase/component' {
-  interface NameServiceMapping {
-    [TELEMETRY_TYPE]: TelemetryService;
-  }
-}
+import { createLoggerProvider } from './helpers';
 
 export function registerTelemetry(): void {
   _registerComponent(
@@ -41,7 +29,9 @@ export function registerTelemetry(): void {
       (container, {}) => {
         // getImmediate for FirebaseApp will always succeed
         const app = container.getProvider('app').getImmediate();
-        return new TelemetryService(app);
+        const loggerProvider = createLoggerProvider();
+
+        return new TelemetryService(app, loggerProvider);
       },
       ComponentType.PUBLIC
     )

packages/telemetry/src/public-types.ts

@@ -16,6 +16,7 @@
  */
 
 import { FirebaseApp } from '@firebase/app';
+import { LoggerProvider } from '@opentelemetry/sdk-logs';
 
 /**
  * An instance of the Firebase Telemetry SDK.
@@ -29,4 +30,7 @@ export interface Telemetry {
    * The {@link @firebase/app#FirebaseApp} this {@link Telemetry} instance is associated with.
    */
   app: FirebaseApp;
+
+  /** The {@link LoggerProvider} this {@link Telemetry} instance uses. */
+  loggerProvider: LoggerProvider;
 }