feat(replay): Add onError callback + other small improvements to debugging

packages/replay-internal/src/replay.ts

@@ -56,6 +56,7 @@ import { isSessionExpired } from './util/isSessionExpired';
 import { sendReplay } from './util/sendReplay';
 import type { SKIPPED } from './util/throttle';
 import { THROTTLED, throttle } from './util/throttle';
+import { RateLimitError } from './util/sendReplayRequest';
 
 /**
  * The main replay container class, which holds all the state and methods for recording and sending replays.
@@ -245,6 +246,9 @@ export class ReplayContainer implements ReplayContainerInterface {
   /** A wrapper to conditionally capture exceptions. */
   public handleException(error: unknown): void {
     DEBUG_BUILD && logger.exception(error);
+    if (this._options.onError) {
+      this._options.onError(error);
+    }
   }
 
   /**
@@ -1157,8 +1161,8 @@ export class ReplayContainer implements ReplayContainerInterface {
         segmentId,
         eventContext,
         session: this.session,
-        options: this.getOptions(),
         timestamp,
+        onError: err => this.handleException(err),
       });
     } catch (err) {
       this.handleException(err);
@@ -1173,7 +1177,8 @@ export class ReplayContainer implements ReplayContainerInterface {
       const client = getClient();
 
       if (client) {
-        client.recordDroppedEvent('send_error', 'replay');
+        const dropReason = err instanceof RateLimitError ? 'ratelimit_backoff' : 'send_error';
+        client.recordDroppedEvent(dropReason, 'replay');
       }
     }
   }

packages/replay-internal/src/types/replay.ts

@@ -26,7 +26,7 @@ export interface SendReplayData {
   eventContext: PopEventContext;
   timestamp: number;
   session: Session;
-  options: ReplayPluginOptions;
+  onError?: (err: unknown) => void;
 }
 
 export interface Timeouts {
@@ -222,6 +222,12 @@ export interface ReplayPluginOptions extends ReplayNetworkOptions {
    */
   beforeErrorSampling?: (event: ErrorEvent) => boolean;
 
+  /**
+   * Callback when an internal SDK error occurs. This can be used to debug SDK
+   * issues.
+   */
+  onError?: (err: unknown) => void;
+
   /**
    * _experiments allows users to enable experimental or internal features.
    * We don't consider such features as part of the public API and hence we don't guarantee semver for them.

packages/replay-internal/src/util/logger.ts

@@ -70,7 +70,7 @@ function makeReplayLogger(): ReplayLogger {
     });
 
     _logger.exception = (error: unknown, ...message: unknown[]) => {
-      if (_logger.error) {
+      if (message && _logger.error) {
         _logger.error(...message);
       }
 
@@ -79,7 +79,7 @@ function makeReplayLogger(): ReplayLogger {
       if (_capture) {
         captureException(error);
       } else if (_trace) {
-        // No need for a breadcrumb is `_capture` is enabled since it should be
+        // No need for a breadcrumb if `_capture` is enabled since it should be
         // captured as an exception
         _addBreadcrumb(error);
       }

packages/replay-internal/src/util/sendReplay.ts

@@ -1,8 +1,7 @@
 import { setTimeout } from '@sentry-internal/browser-utils';
-import { captureException, setContext } from '@sentry/core';
+import { setContext } from '@sentry/core';
 
 import { RETRY_BASE_INTERVAL, RETRY_MAX_COUNT, UNABLE_TO_SEND_REPLAY } from '../constants';
-import { DEBUG_BUILD } from '../debug-build';
 import type { SendReplayData } from '../types';
 import { RateLimitError, TransportStatusCodeError, sendReplayRequest } from './sendReplayRequest';
 
@@ -16,7 +15,7 @@ export async function sendReplay(
     interval: RETRY_BASE_INTERVAL,
   },
 ): Promise<unknown> {
-  const { recordingData, options } = replayData;
+  const { recordingData, onError } = replayData;
 
   // short circuit if there's no events to upload (this shouldn't happen as _runFlush makes this check)
   if (!recordingData.length) {
@@ -36,8 +35,8 @@ export async function sendReplay(
       _retryCount: retryConfig.count,
     });
 
-    if (DEBUG_BUILD && options._experiments && options._experiments.captureExceptions) {
-      captureException(err);
+    if (onError) {
+      onError(err);
     }
 
     // If an error happened here, it's likely that uploading the attachment