TypeError: countLines is not a function

[renyufei8023]

What React Native libraries do you use?

RN New Architecture

Are you using sentry.io or on-premise?

on-premise (Self-Hosted)

@sentry/react-native SDK Version

7.1.0

How does your development environment look like?

System:
  OS: macOS 15.6.1
  CPU: (4) x64 Intel(R) Core(TM) i5-7500 CPU @ 3.40GHz
  Memory: 53.39 MB / 32.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 22.16.0
    path: /usr/local/opt/node@22/bin/node
  Yarn:
    version: 1.22.22
    path: /usr/local/opt/node@22/bin/yarn
  npm:
    version: 10.9.2
    path: /usr/local/opt/node@22/bin/npm
  Watchman: Not Found
Managers:
  CocoaPods:
    version: 1.16.2
    path: /usr/local/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.5
      - iOS 18.5
      - macOS 15.5
      - tvOS 18.5
      - visionOS 2.5
      - watchOS 11.5
  Android SDK: Not Found
IDEs:
  Android Studio: 2024.3 AI-243.25659.59.2432.13423653
  Xcode:
    version: 16.4/16F6
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.11
    path: /usr/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 20.0.0
    wanted: 20.0.0
  react:
    installed: 19.1.0
    wanted: 19.1.0
  react-native:
    installed: 0.81.4
    wanted: 0.81.4
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: true
  newArchEnabled: true
iOS:
  hermesEnabled: true
  newArchEnabled: false

Sentry.init()

Sentry.init({
                enableNative: true,
                maxValueLength: 20000,
                attachScreenshot: true,
                attachViewHierarchy: true,
                enableCaptureFailedRequests: true,
                debug: true,
                dist: BuildVersion,
                release: deviceInfoModule.getVersion(),
                // Set tracesSampleRate to 1.0 to capture 100% of transactions for performance monitoring.
                // We recommend adjusting this value in production.
                tracesSampleRate: 0.1,
                enableAppStartTracking: true,
                enableNativeFramesTracking: true,
                enableStallTracking: true,
                enableUserInteractionTracing: true,
                sendDefaultPii: true,
                integrations: [
                    navigationIntegration
                ],
                _experiments: {
                    enableUnhandledCPPExceptionsV2: true,
                },
                useThreadsForMessageStack: true,
                // _experiments: {
                //     // The sampling rate for profiling is relative to TracesSampleRate.
                //     // In this case, we'll capture profiles for 100% of transactions.
                //     profilesSampleRate: 1.0,
                // },
            });

Steps to Reproduce

1.yarn 2.yarn start --reset-cache 3.open iPhone Simulator

Expected Result

This error does not appear

Actual Result

TypeError: countLines is not a function

Now I have solved the problem through this method:

"resolutions": {
    "metro": "0.83.1",
    "metro-core": "0.83.1",
    "metro-config": "0.83.1"
  }

[linear]

RN-339 TypeError: countLines is not a function

[antonis]

Thank you for reporting @renyufei8023 🙇
Did the issue appear after upgrading Sentry or React Native? If yes, which was the previous version that worked for you?

The issue might be related to #5066

[schriker]

Hi, 👋 I have the same issue. We are using "@sentry/react-native": "6.20.0", and the error starts after updateding our project to Expo@54.0.9 and RN@0.81.4

Edit:

Full log, it is hapening on local but also on eas builds:

countLines is not a function
TypeError: countLines is not a function
TypeError: countLines is not a function
    at createDebugIdModule (/Users/expo/workingdir/build/node_modules/@sentry/react-native/src/js/tools/sentryMetroSerializer.ts:182:22)
    at unstable_beforeAssetSerializationPlugin (/Users/expo/workingdir/build/node_modules/@sentry/react-native/src/js/tools/sentryMetroSerializer.ts:47:25)
    at Chunk.serializeToAssetsAsync (/Users/expo/workingdir/build/node_modules/@expo/metro-config/src/serializer/serializeChunks.ts:430:27)
    at /Users/expo/workingdir/build/node_modules/@expo/metro-config/src/serializer/serializeChunks.ts:752:25
    at Array.map (<anonymous>)
    at serializeChunksAsync (/Users/expo/workingdir/build/node_modules/@expo/metro-config/src/serializer/serializeChunks.ts:750:17)
    at graphToSerialAssetsAsync (/Users/expo/workingdir/build/node_modules/@expo/metro-config/src/serializer/serializeChunks.ts:181:26)
    at expoSerializer (/Users/expo/workingdir/build/node_modules/@expo/metro-config/src/serializer/withExpoSerializers.ts:322:50)
    at /Users/expo/workingdir/build/node_modules/@expo/metro-config/src/serializer/withExpoSerializers.ts:364:14
    at processTicksAndRejections (node:internal/process/task_queues:105:5)

[schriker]

I think this change is causing this issue:

facebook/metro@5d301d7

If I apply a quick patch for 6.20.0, it works for me:

diff --git a/dist/js/tools/sentryMetroSerializer.js b/dist/js/tools/sentryMetroSerializer.js
index d7f2350196fc008f9f1ce530e224fe3d052347e9..38d0fcab02dbd86196688d2ba7195bdff0a38875 100644
--- a/dist/js/tools/sentryMetroSerializer.js
+++ b/dist/js/tools/sentryMetroSerializer.js
@@ -12,18 +12,17 @@ exports.createSentryMetroSerializer = exports.unstable_beforeAssetSerializationP
 const crypto = require("crypto");
 const utils_1 = require("./utils");
 const utils_2 = require("./vendor/metro/utils");
-let countLines;
-try {
-    countLines = require('metro/private/lib/countLines');
-}
-catch (e) {
-    countLines = require('metro/src/lib/countLines');
-}
 const DEBUG_ID_PLACE_HOLDER = '__debug_id_place_holder__';
 const DEBUG_ID_MODULE_PATH = '__debugid__';
 const PRELUDE_MODULE_PATH = '__prelude__';
 const SOURCE_MAP_COMMENT = '//# sourceMappingURL=';
 const DEBUG_ID_COMMENT = '//# debugId=';
+const newline = /\r\n?|\n|\u2028|\u2029/g;
+
+function countLines(string) {
+    return (string.match(newline) || []).length + 1;
+}
+
 /**
  * Adds Sentry Debug ID polyfill module to the bundle.
  */

[linear]

from @antonis:

Thank you for reporting. We will investigate this and iterate back.