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Cover image for Flutter Web: Sentry
happyharis
happyharis

Posted on

Flutter Web: Sentry

#flutter #flutterweb #sentry #webdev

When you have a production ready application, how are you going to catch those pesky bugs?

Even if your users has a specific use case, it takes a lot of work to figure which exact code is giving the bug.

No worries, Sentry is here. It is a platform that helps you show the errors that you might not have thought of in your production app.

Now that Flutter Web is in beta, we gotta catch those pesky bugs when we release our Flutter Web apps out there (maybe using Firebase hosting). Flutter has release some packages that can be used in the Flutter Web, and one of it is Sentry.

Once you have sign up with an account, create a project under others.

Screenshot of Creation of Project Other in Sentry

Sadly, Flutter is not one of the platforms.

Then go to your settings, and get your DSN keys.

DSN Keys

"A DSN, or Data Source Name. It looks a lot like a standard URL, but it’s actually just a representation of the configuration required by the Sentry SDKs. It consists of a few pieces, including the protocol, public key, the server address, and the project identifier." Source: Sentry

Then, we have to install the Sentry dependencies in our Flutter Web app.

// In pubspec.yaml

dependencies:
  sentry: <latest version>

Next, we have to initialise our sentry client with our DSN (that we got earlier) in our app and send our first error!

// In main.dart

import 'package:sentry/sentry.dart';

final SentryClient sentry = new SentryClient(dsn: YOUR_DSN);

main() async {
  try {
    throw new StateError('This is a Dart exception.');
  } catch(error, stackTrace) {
    await sentry.captureException(
      exception: error,
      stackTrace: stackTrace,
    );
  }
}

It will be reflected in your Sentry board as such:

First Issue in Sentry

What if we want to catch any uncaught error?

Good question. You will have to use runZoned to catch all errors by flutter.

On the Web Window callback fields should preserve the zone #49199

happyharis avatar
happyharis posted on

Steps to Reproduce

First, I tested the standalone method sentry.captureException() on chrome. It works. This would be recorded in the Sentry dashboard.

import 'package:sentry/sentry.dart';

final SentryClient sentry = new SentryClient(dsn: YOUR_DSN);

main() async {
  try {
    throw new StateError('This is a Dart exception.');
  } catch(error, stackTrace) {
    await sentry.captureException(
      exception: error,
      stackTrace: stackTrace,
    );
  }
}

Second, I used the repo crashy's main.dart code to test Sentry.

However, when these three methods below ran, it did not get recorded in Sentry:

// First, not recorded
throw new StateError('This is a Dart exception.');

// Second, not recorded
foo() async {
  throw new StateError('This is an async Dart exception.');
}
bar() async {
  await foo();
}
await bar();

// Third, not recorded
final channel = const MethodChannel('crashy-custom-channel');
await channel.invokeMethod('blah');

Tested again with iOS 13.3 simulator (iPhone Max 11), and all of these methods above were working.

Logs 
// Ran flutter run -d chrome --verbose

[  +27 ms] executing: [/Users/haris/Development/flutter/] git -c log.showSignature=false log -n 1
--pretty=format:%H
[  +43 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] 18cd7a3601bcffb36fdf2f679f763b5e827c2e8e
[        ] executing: [/Users/haris/Development/flutter/] git describe --match v*.*.* --first-parent
--long --tags
[  +36 ms] Exit code 0 from: git describe --match v*.*.* --first-parent --long --tags
[        ] v1.12.13+hotfix.6-0-g18cd7a360
[   +8 ms] executing: [/Users/haris/Development/flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[  +14 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/beta
[        ] executing: [/Users/haris/Development/flutter/] git ls-remote --get-url origin
[  +17 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/flutter/flutter.git
[  +54 ms] executing: [/Users/haris/Development/flutter/] git rev-parse --abbrev-ref HEAD
[  +12 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] beta
[   +7 ms] executing: sw_vers -productName
[  +15 ms] Exit code 0 from: sw_vers -productName
[        ] Mac OS X
[        ] executing: sw_vers -productVersion
[  +16 ms] Exit code 0 from: sw_vers -productVersion
[        ] 10.15.2
[        ] executing: sw_vers -buildVersion
[  +15 ms] Exit code 0 from: sw_vers -buildVersion
[        ] 19C57
[  +31 ms] executing: /usr/bin/xcode-select --print-path
[  +14 ms] Exit code 0 from: /usr/bin/xcode-select --print-path
[        ] /Applications/Xcode.app/Contents/Developer
[   +1 ms] executing: /usr/bin/xcodebuild -version
[ +966 ms] Exit code 0 from: /usr/bin/xcodebuild -version
[   +2 ms] Xcode 11.3.1
           Build version 11C504
[  +57 ms] executing: /Users/haris/Library/Android/sdk/platform-tools/adb devices -l
[   +7 ms] Exit code 0 from: /Users/haris/Library/Android/sdk/platform-tools/adb devices -l
[        ] List of devices attached
[  +13 ms] executing:
/Users/haris/Development/flutter/bin/cache/artifacts/libimobiledevice/idevice_id -h
[  +89 ms] /usr/bin/xcrun simctl list --json devices
[ +167 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[   +7 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +61 ms] Found plugin firebase_core at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core-0.4.3+1/
[   +9 ms] Found plugin firebase_core_web at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_web-0.1.1+1/
[  +72 ms] Found plugin url_launcher at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-5.4.1/
[   +5 ms] Found plugin url_launcher_macos at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_macos-0.0.1+2/
[   +6 ms] Found plugin url_launcher_web at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_web-0.1.0+2/
[  +56 ms] Found plugin firebase_core at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core-0.4.3+1/
[   +7 ms] Found plugin firebase_core_web at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_web-0.1.1+1/
[  +33 ms] Found plugin url_launcher at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-5.4.1/
[   +2 ms] Found plugin url_launcher_macos at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_macos-0.0.1+2/
[   +2 ms] Found plugin url_launcher_web at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_web-0.1.0+2/
[  +77 ms] Generating
/Users/haris/Desktop/linktree_public_demo/android/app/src/main/java/io/flutter/plugins/GeneratedPlug
inRegistrant.java
β£½[ +441 ms] executing: [/Users/haris/Desktop/linktree_public_demo/ios/Runner.xcodeproj/]
/usr/bin/xcodebuild -project /Users/haris/Desktop/linktree_public_demo/ios/Runner.xcodeproj -target
Runner -showBuildSettings
[        ] executing: [/Users/haris/Desktop/linktree_public_demo/ios/Runner.xcodeproj/]
/usr/bin/xcodebuild -project /Users/haris/Desktop/linktree_public_demo/ios/Runner.xcodeproj -target
Runner -showBuildSettings
 
(This is taking an unexpectedly long time.)β£·[+3018 ms] Build settings for action build and target Runner:
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                        MAC_OS_X_VERSION_ACTUAL = 101502
                        MAC_OS_X_VERSION_MAJOR = 101500
                        MAC_OS_X_VERSION_MINOR = 1502
                        METAL_LIBRARY_FILE_BASE = default
                        METAL_LIBRARY_OUTPUT_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Release-iphoneos/Runner.
                        app
                        MODULES_FOLDER_PATH = Runner.app/Modules
                        MODULE_CACHE_DIR =
                        /Users/haris/Library/Developer/Xcode/DerivedData/ModuleCache.noindex
                        MTL_ENABLE_DEBUG_INFO = NO
                        NATIVE_ARCH = armv7
                        NATIVE_ARCH_32_BIT = i386
                        NATIVE_ARCH_64_BIT = x86_64
                        NATIVE_ARCH_ACTUAL = x86_64
                        NO_COMMON = YES
                        OBJECT_FILE_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/Release-iph
                        oneos/Runner.build/Objects
                        OBJECT_FILE_DIR_normal =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/Release-iph
                        oneos/Runner.build/Objects-normal
                        OBJROOT = /Users/haris/Desktop/linktree_public_demo/build/ios
                        ONLY_ACTIVE_ARCH = NO
                        OS = MACOS
                        OSAC = /usr/bin/osacompile
                        PACKAGE_TYPE = com.apple.package-type.wrapper.application
                        PASCAL_STRINGS = YES
                        PATH =
                        /Applications/Xcode.app/Contents/Developer/usr/bin:/Library/Frameworks/Pytho
                        n.framework/Versions/3.7/bin:/Users/haris/.rvm/gems/ruby-2.6.3/bin:/Users/ha
                        ris/.rvm/gems/ruby-2.6.3@global/bin:/Users/haris/.rvm/rubies/ruby-2.6.3/bin:
                        /Users/haris/.nvm/versions/node/v13.1.0/bin:/Users/haris/.fastlane/bin:/usr/
                        local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/Postgres.app/Contents/
                        Versions/latest/bin:/Library/Frameworks/Python.framework/Versions/3.7/bin:/U
                        sers/haris/.rvm/gems/ruby-2.6.3/bin:/Users/haris/.rvm/gems/ruby-2.6.3@global
                        /bin:/Users/haris/.rvm/rubies/ruby-2.6.3/bin:/Users/haris/.nvm/versions/node
                        /v13.1.0/bin:/Users/haris/.fastlane/bin:/Users/haris/Development/flutter/bin
                        :/Users/haris/.rvm/bin:/usr/java/jre1.6.0_24/bin/:/Users/haris/Desktop/pslov
                        e-period-tracker/bin:/Users/haris/Development/flutter/bin:/usr/java/jre1.6.0
                        _24/bin/:/Users/haris/Desktop/pslove-period-tracker/bin
                        PATH_PREFIXES_EXCLUDED_FROM_HEADER_DEPENDENCIES = /usr/include
                        /usr/local/include /System/Library/Frameworks
                        /System/Library/PrivateFrameworks
                        /Applications/Xcode.app/Contents/Developer/Headers
                        /Applications/Xcode.app/Contents/Developer/SDKs
                        /Applications/Xcode.app/Contents/Developer/Platforms
                        PBDEVELOPMENTPLIST_PATH = Runner.app/pbdevelopment.plist
                        PFE_FILE_C_DIALECTS = objective-c
                        PKGINFO_FILE_PATH =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/Release-iph
                        oneos/Runner.build/PkgInfo
                        PKGINFO_PATH = Runner.app/PkgInfo
                        PLATFORM_DEVELOPER_APPLICATIONS_DIR =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Devel
                        oper/Applications
                        PLATFORM_DEVELOPER_BIN_DIR =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Devel
                        oper/usr/bin
                        PLATFORM_DEVELOPER_LIBRARY_DIR =
                        /Applications/Xcode.app/Contents/PlugIns/Xcode3Core.ideplugin/Contents/Share
                        dSupport/Developer/Library
                        PLATFORM_DEVELOPER_SDK_DIR =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Devel
                        oper/SDKs
                        PLATFORM_DEVELOPER_TOOLS_DIR =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Devel
                        oper/Tools
                        PLATFORM_DEVELOPER_USR_DIR =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Devel
                        oper/usr
                        PLATFORM_DIR =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform
                        PLATFORM_DISPLAY_NAME = iOS
                        PLATFORM_NAME = iphoneos
                        PLATFORM_PREFERRED_ARCH = arm64
                        PLATFORM_PRODUCT_BUILD_VERSION = 17B102
                        PLIST_FILE_OUTPUT_FORMAT = binary
                        PLUGINS_FOLDER_PATH = Runner.app/PlugIns
                        PRECOMPS_INCLUDE_HEADERS_FROM_BUILT_PRODUCTS_DIR = YES
                        PRECOMP_DESTINATION_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/Release-iph
                        oneos/Runner.build/PrefixHeaders
                        PRESERVE_DEAD_CODE_INITS_AND_TERMS = NO
                        PRIVATE_HEADERS_FOLDER_PATH = Runner.app/PrivateHeaders
                        PRODUCT_BUNDLE_IDENTIFIER = com.example.linktreeDemoClone
                        PRODUCT_BUNDLE_PACKAGE_TYPE = APPL
                        PRODUCT_MODULE_NAME = Runner
                        PRODUCT_NAME = Runner
                        PRODUCT_SETTINGS_PATH =
                        /Users/haris/Desktop/linktree_public_demo/ios/Runner/Info.plist
                        PRODUCT_TYPE = com.apple.product-type.application
                        PROFILING_CODE = NO
                        PROJECT = Runner
                        PROJECT_DERIVED_FILE_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/DerivedSour
                        ces
                        PROJECT_DIR = /Users/haris/Desktop/linktree_public_demo/ios
                        PROJECT_FILE_PATH =
                        /Users/haris/Desktop/linktree_public_demo/ios/Runner.xcodeproj
                        PROJECT_NAME = Runner
                        PROJECT_TEMP_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build
                        PROJECT_TEMP_ROOT = /Users/haris/Desktop/linktree_public_demo/build/ios
                        PROVISIONING_PROFILE_REQUIRED = YES
                        PUBLIC_HEADERS_FOLDER_PATH = Runner.app/Headers
                        RECURSIVE_SEARCH_PATHS_FOLLOW_SYMLINKS = YES
                        REMOVE_CVS_FROM_RESOURCES = YES
                        REMOVE_GIT_FROM_RESOURCES = YES
                        REMOVE_HEADERS_FROM_EMBEDDED_BUNDLES = YES
                        REMOVE_HG_FROM_RESOURCES = YES
                        REMOVE_SVN_FROM_RESOURCES = YES
                        RESOURCE_RULES_REQUIRED = YES
                        REZ_COLLECTOR_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/Release-iph
                        oneos/Runner.build/ResourceManagerResources
                        REZ_OBJECTS_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/Release-iph
                        oneos/Runner.build/ResourceManagerResources/Objects
                        SCAN_ALL_SOURCE_FILES_FOR_INCLUDES = NO
                        SCRIPTS_FOLDER_PATH = Runner.app/Scripts
                        SDKROOT =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Devel
                        oper/SDKs/iPhoneOS13.2.sdk
                        SDK_DIR =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Devel
                        oper/SDKs/iPhoneOS13.2.sdk
                        SDK_DIR_iphoneos13_2 =
                        /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Devel
                        oper/SDKs/iPhoneOS13.2.sdk
                        SDK_NAME = iphoneos13.2
                        SDK_NAMES = iphoneos13.2
                        SDK_PRODUCT_BUILD_VERSION = 17B102
                        SDK_VERSION = 13.2
                        SDK_VERSION_ACTUAL = 130200
                        SDK_VERSION_MAJOR = 130000
                        SDK_VERSION_MINOR = 200
                        SED = /usr/bin/sed
                        SEPARATE_STRIP = NO
                        SEPARATE_SYMBOL_EDIT = NO
                        SET_DIR_MODE_OWNER_GROUP = YES
                        SET_FILE_MODE_OWNER_GROUP = NO
                        SHALLOW_BUNDLE = YES
                        SHARED_DERIVED_FILE_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Release-iphoneos/Derived
                        Sources
                        SHARED_FRAMEWORKS_FOLDER_PATH = Runner.app/SharedFrameworks
                        SHARED_PRECOMPS_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/SharedPrecompiledHeaders
                        SHARED_SUPPORT_FOLDER_PATH = Runner.app/SharedSupport
                        SKIP_INSTALL = NO
                        SOURCE_ROOT = /Users/haris/Desktop/linktree_public_demo/ios
                        SRCROOT = /Users/haris/Desktop/linktree_public_demo/ios
                        STRINGS_FILE_OUTPUT_ENCODING = binary
                        STRIP_BITCODE_FROM_COPIED_FILES = YES
                        STRIP_INSTALLED_PRODUCT = YES
                        STRIP_STYLE = all
                        STRIP_SWIFT_SYMBOLS = YES
                        SUPPORTED_DEVICE_FAMILIES = 1,2
                        SUPPORTED_PLATFORMS = iphoneos
                        SUPPORTS_MACCATALYST = NO
                        SUPPORTS_TEXT_BASED_API = NO
                        SWIFT_COMPILATION_MODE = wholemodule
                        SWIFT_OBJC_BRIDGING_HEADER = Runner/Runner-Bridging-Header.h
                        SWIFT_OPTIMIZATION_LEVEL = -O
                        SWIFT_PLATFORM_TARGET_PREFIX = ios
                        SWIFT_VERSION = 5.0
                        SYMROOT = /Users/haris/Desktop/linktree_public_demo/build/ios
                        SYSTEM_ADMIN_APPS_DIR = /Applications/Utilities
                        SYSTEM_APPS_DIR = /Applications
                        SYSTEM_CORE_SERVICES_DIR = /System/Library/CoreServices
                        SYSTEM_DEMOS_DIR = /Applications/Extras
                        SYSTEM_DEVELOPER_APPS_DIR =
                        /Applications/Xcode.app/Contents/Developer/Applications
                        SYSTEM_DEVELOPER_BIN_DIR =
                        /Applications/Xcode.app/Contents/Developer/usr/bin
                        SYSTEM_DEVELOPER_DEMOS_DIR =
                        /Applications/Xcode.app/Contents/Developer/Applications/Utilities/Built
                        Examples
                        SYSTEM_DEVELOPER_DIR = /Applications/Xcode.app/Contents/Developer
                        SYSTEM_DEVELOPER_DOC_DIR = /Applications/Xcode.app/Contents/Developer/ADC
                        Reference Library
                        SYSTEM_DEVELOPER_GRAPHICS_TOOLS_DIR =
                        /Applications/Xcode.app/Contents/Developer/Applications/Graphics Tools
                        SYSTEM_DEVELOPER_JAVA_TOOLS_DIR =
                        /Applications/Xcode.app/Contents/Developer/Applications/Java Tools
                        SYSTEM_DEVELOPER_PERFORMANCE_TOOLS_DIR =
                        /Applications/Xcode.app/Contents/Developer/Applications/Performance Tools
                        SYSTEM_DEVELOPER_RELEASENOTES_DIR =
                        /Applications/Xcode.app/Contents/Developer/ADC Reference
                        Library/releasenotes
                        SYSTEM_DEVELOPER_TOOLS = /Applications/Xcode.app/Contents/Developer/Tools
                        SYSTEM_DEVELOPER_TOOLS_DOC_DIR =
                        /Applications/Xcode.app/Contents/Developer/ADC Reference
                        Library/documentation/DeveloperTools
                        SYSTEM_DEVELOPER_TOOLS_RELEASENOTES_DIR =
                        /Applications/Xcode.app/Contents/Developer/ADC Reference
                        Library/releasenotes/DeveloperTools
                        SYSTEM_DEVELOPER_USR_DIR = /Applications/Xcode.app/Contents/Developer/usr
                        SYSTEM_DEVELOPER_UTILITIES_DIR =
                        /Applications/Xcode.app/Contents/Developer/Applications/Utilities
                        SYSTEM_DEXT_INSTALL_PATH = /System/Library/DriverExtensions
                        SYSTEM_DOCUMENTATION_DIR = /Library/Documentation
                        SYSTEM_KEXT_INSTALL_PATH = /System/Library/Extensions
                        SYSTEM_LIBRARY_DIR = /System/Library
                        TAPI_VERIFY_MODE = ErrorsOnly
                        TARGETED_DEVICE_FAMILY = 1,2
                        TARGETNAME = Runner
                        TARGET_BUILD_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Release-iphoneos
                        TARGET_NAME = Runner
                        TARGET_TEMP_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/Release-iph
                        oneos/Runner.build
                        TEMP_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/Release-iph
                        oneos/Runner.build
                        TEMP_FILES_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/Release-iph
                        oneos/Runner.build
                        TEMP_FILE_DIR =
                        /Users/haris/Desktop/linktree_public_demo/build/ios/Runner.build/Release-iph
                        oneos/Runner.build
                        TEMP_ROOT = /Users/haris/Desktop/linktree_public_demo/build/ios
                        TOOLCHAIN_DIR =
                        /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolcha
                        in
                        TREAT_MISSING_BASELINES_AS_TEST_FAILURES = NO
                        UID = 501
                        UNLOCALIZED_RESOURCES_FOLDER_PATH = Runner.app
                        UNSTRIPPED_PRODUCT = NO
                        USER = haris
                        USER_APPS_DIR = /Users/haris/Applications
                        USER_LIBRARY_DIR = /Users/haris/Library
                        USE_DYNAMIC_NO_PIC = YES
                        USE_HEADERMAP = YES
                        USE_HEADER_SYMLINKS = NO
                        USE_LLVM_TARGET_TRIPLES = YES
                        USE_LLVM_TARGET_TRIPLES_FOR_CLANG = YES
                        USE_LLVM_TARGET_TRIPLES_FOR_LD = YES
                        USE_LLVM_TARGET_TRIPLES_FOR_TAPI = YES
                        VALIDATE_PRODUCT = YES
                        VALIDATE_WORKSPACE = NO
                        VALID_ARCHS = arm64 arm64e armv7 armv7s
                        VERBOSE_PBXCP = NO
                        VERSIONING_SYSTEM = apple-generic
                        VERSIONPLIST_PATH = Runner.app/version.plist
                        VERSION_INFO_BUILDER = haris
                        VERSION_INFO_FILE = Runner_vers.c
                        VERSION_INFO_STRING = "@(#)PROGRAM:Runner  PROJECT:Runner-1"
                        WRAPPER_EXTENSION = app
                        WRAPPER_NAME = Runner.app
                        WRAPPER_SUFFIX = .app
                        WRAP_ASSET_PACKS_IN_SEPARATE_DIRECTORIES = NO
                        XCODE_APP_SUPPORT_DIR =
                        /Applications/Xcode.app/Contents/Developer/Library/Xcode
                        XCODE_PRODUCT_BUILD_VERSION = 11C504
                        XCODE_VERSION_ACTUAL = 1131
                        XCODE_VERSION_MAJOR = 1100
                        XCODE_VERSION_MINOR = 1130
                        XPCSERVICES_FOLDER_PATH = Runner.app/XPCServices
                        YACC = yacc
                        arch = arm64
                        variant = normal
[ +108 ms] Launching lib/main.dart on Chrome in debug mode...
[        ] Building application for the web...
[ +186 ms] Found plugin firebase_core at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core-0.4.3+1/
[   +2 ms] Found plugin firebase_core_web at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core_web-0.1.1+1/
[  +22 ms] Found plugin url_launcher at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher-5.4.1/
[   +1 ms] Found plugin url_launcher_macos at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_macos-0.0.1+2/
[   +2 ms] Found plugin url_launcher_web at
/Users/haris/Development/flutter/.pub-cache/hosted/pub.dartlang.org/url_launcher_web-0.1.0+2/
[+9456 ms] Starting daemon...
[ +313 ms] Initializing inputs
[  +19 ms] Reading cached asset graph...
[ +634 ms] Reading cached asset graph completed, took 630ms

[ +588 ms] Checking for updates since last build...
[ +689 ms] Checking for updates since last build completed, took 689ms

[  +10 ms] Initializing inputs
[   +2 ms] Reading cached asset graph...
[        ] Reading cached asset graph completed, took 630ms
[        ] Checking for updates since last build...
[        ] Checking for updates since last build completed, took 689ms
[ +210 ms] Serving DevTools at http://127.0.0.1:65323

[ +754 ms] About to build [web]...
[   +5 ms] Running build...
[ +203 ms] Running build completed, took 94ms

[   +1 ms] Caching finalized dependency graph...
[   +9 ms] Caching finalized dependency graph completed, took 137ms

[   +6 ms] Succeeded after 240ms with 0 outputs (0 actions)

[  +13 ms] Building application for the web... (completed in 13.1s)
[        ] Attempting to connect to browser instance..
[+4885 ms] Debug service listening on ws://127.0.0.1:65369/IqWOt77bhe8=

[ +332 ms]       Failed to load asset at path:
packages/build_web_compilers/src/dev_compiler/dart_sdk.js.

                          Status code: 404

                          Headers:
                          {
                      "date": "Tue, 21 Jan 2020 09:58:35 GMT",
                      "content-length": "9",
                      "x-frame-options": "SAMEORIGIN",
                      "content-type": "text/plain; charset=utf-8",
                      "x-xss-protection": "1; mode=block",
                      "x-content-type-options": "nosniff",
                      "server": "dart:io with Shelf",
                      "via": "1.1 shelf_proxy"
                    }

                          Content:
                          Not Found}

[  +53 ms] Attempting to connect to browser instance.. (completed in 5.3s)
[   +1 ms] Warning: Flutter's support for web development is not stable yet and hasn't
[        ] been thoroughly tested in production environments.
[        ] For more information see https://flutter.dev/web
[   +2 ms] πŸ”₯  To hot restart changes while running, press "r". To hot restart (and refresh the
browser), press
           "R".
[   +2 ms] For a more detailed help message, press "h". To quit, press "q".
[  +12 ms] Debug service listening on ws://127.0.0.1:65369/IqWOt77bhe8=
// Ran flutter analyze
 info β€’ Unused import: 'dart:ui' β€’ lib/generated_plugin_registrant.dart:4:8 β€’ unused_import
// Ran flutter doctor -v

[βœ“] Flutter (Channel beta, v1.12.13+hotfix.6, on Mac OS X 10.15.2 19C57, locale en-SG)
    β€’ Flutter version 1.12.13+hotfix.6 at /Users/haris/Development/flutter
    β€’ Framework revision 18cd7a3601 (6 weeks ago), 2019-12-11 06:35:39 -0800
    β€’ Engine revision 2994f7e1e6
    β€’ Dart version 2.7.0

 
[βœ“] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    β€’ Android SDK at /Users/haris/Library/Android/sdk
    β€’ Android NDK location not configured (optional; useful for native profiling support)
    β€’ Platform android-28, build-tools 28.0.3
    β€’ Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    β€’ Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
    β€’ All Android licenses accepted.

[βœ“] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    β€’ Xcode at /Applications/Xcode.app/Contents/Developer
    β€’ Xcode 11.3.1, Build version 11C504
    β€’ CocoaPods version 1.7.1

[βœ“] Chrome - develop for the web
    β€’ Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[βœ“] Android Studio (version 3.4)
    β€’ Android Studio at /Applications/Android Studio.app/Contents
    β€’ Flutter plugin version 36.0.1
    β€’ Dart plugin version 183.6270
    β€’ Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)

[βœ“] VS Code (version 1.41.1)
    β€’ VS Code at /Applications/Visual Studio Code.app/Contents
    β€’ Flutter extension version 3.7.1

[βœ“] Connected device (3 available)
    β€’ iPhone 11 Pro Max β€’ B2E57F80-0B9E-4CF7-B413-D703677FEC2F β€’ ios            β€’
      com.apple.CoreSimulator.SimRuntime.iOS-13-3 (simulator)
    β€’ Chrome            β€’ chrome                               β€’ web-javascript β€’ Google Chrome
      79.0.3945.117
    β€’ Web Server        β€’ web-server                           β€’ web-javascript β€’ Flutter Tools

β€’ No issues found!
View on GitHub

Sadly, there is an error (currently) in the web client side of the Flutter's Sentry package. Thus, you have to catch your errors manually using the above code.

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