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Question

i can’t build a flutter app for the web , i got problems about dependencies , i tried to upgrade flutter but it didn’t work so i downgrade it back to it’s original version.

here is my pubspec.yaml

                environment:
                  sdk: ">=2.12.0 <3.0.0"

                dependencies:
                  abg_utils: 8.0.8
                  html_editor_enhanced: 2.5.1
                  timeago: ^3.1.0
                  maps_toolkit: ^2.0.0
                  google_maps_flutter_web: 0.3.2+1
                  google_maps_flutter: 2.1.1
                  universal_html: 2.0.8
                  soundpool: 2.2.0
                  provider: 6.0.2
                  image_picker: 0.8.4+7
                  syncfusion_flutter_charts: 19.2.62

                  flutter:
                    sdk: flutter

                  flutter_lints: ^1.0.4
                  cupertino_icons: ^1.0.2


                dependency_overrides:
                  ffi: ^2.0.1
                  win32: ^3.0.0


                dev_dependencies:
                  flutter_test:
                    sdk: flutter

                flutter:

                  uses-material-design: true

                  assets:
                    - assets/
                    - assets/dashboard2/
                    - assets/fonts/
                    - assets/ondemands/
                    - assets/elements/


                  fonts:
                    - family: Montserrat
                      fonts:
                        - asset: assets/fonts/Montserrat-Regular.ttf
                          weight: 400
                        - asset: assets/fonts/Montserrat-Bold.ttf
                          weight: 600
                        - asset: assets/fonts/Montserrat-ExtraBold.ttf
                          weight: 800
                    - family: Harmattan # arabic
                      fonts:
                        - asset: assets/fonts/Harmattan-Regular.ttf
                          weight: 400
                        - asset: assets/fonts/Harmattan-Bold.ttf
                          weight: 800

                    - family: NunitoSans
                      fonts:
                        - asset: assets/fonts/NunitoSans-Regular.ttf
                          weight: 400
                        - asset: assets/fonts/NunitoSans-Bold.ttf
                          weight: 600
                        - asset: assets/fonts/NunitoSans-ExtraBold.ttf
                          weight: 800

and when i run this command flutter build web i got those errors and warning

                  Target dart2js failed: Exception: Warning: The 'dart2js' entrypoint script is deprecated, please use 'dart compile js' instead.
              ../../../.pub-cache/hosted/pub.dev/firebase_messaging_web-2.4.4/lib/src/internals.dart:2:1:
              Error: Error when reading '../../../.pub-cache/hosted/pub.dev/firebase_core-1.24.0/lib/src/internals.dart': Error reading '../../../.pub-cache/hosted/pub.dev/firebase_core-1.24.0/lib/src/internals.dart'  (No such
              file or directory)
              export 'package:firebase_core/src/internals.dart' hide guardWebExceptions;
              ^
              ../../../.pub-cache/hosted/pub.dev/firebase_messaging_web-2.4.4/lib/src/internals.dart:6:8:
              Error: Error when reading '../../../.pub-cache/hosted/pub.dev/firebase_core-1.24.0/lib/src/internals.dart': Error reading '../../../.pub-cache/hosted/pub.dev/firebase_core-1.24.0/lib/src/internals.dart'  (No such
              file or directory)
              import 'package:firebase_core/src/internals.dart' as internals;
                     ^
              ../../../.pub-cache/hosted/pub.dev/firebase_core-1.24.0/lib/src/firebase_app.dart:18:25:
              Error: Member not found: 'FirebaseAppPlatform.verifyExtends'.
                  FirebaseAppPlatform.verifyExtends(_delegate);
                                      ^^^^^^^^^^^^^
              ../../../.pub-cache/hosted/pub.dev/abg_utils-8.0.8/lib/src/ui/parent_screen.dart:31:22:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                    WidgetsBinding.instance!.addPostFrameCallback((_) {
                                   ^
              ../../../.pub-cache/hosted/pub.dev/abg_utils-8.0.8/lib/src/ui/scroller_resizer.dart:64:22:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                    WidgetsBinding.instance!.addPostFrameCallback((_) {
                                   ^
              ../../../.pub-cache/hosted/pub.dev/abg_utils-8.0.8/lib/src/ui/dialogs/easy_dialog_2.dart:138:38:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                                    WidgetsBinding.instance!.addPostFrameCallback((_) {
                                                   ^
              lib/ui/payouts.dart:38:20:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                  WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                 ^
              lib/ui/product/product.dart:36:20:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                  WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                 ^
              lib/ui/product/product.dart:214:34:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                                WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                               ^
              lib/ui/product/product.dart:265:24:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                      WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                     ^
              lib/ui/providers/providers_request.dart:40:20:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                  WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                 ^
              lib/ui/review.dart:23:20:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                  WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                 ^
              lib/ui/settings/admin_panel_app_settings.dart:23:20:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                  WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                 ^
              lib/ui/settings/provider_app_settings.dart:23:20:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                  WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                 ^
              lib/ui/settings/website_app_settings.dart:24:20:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                  WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                 ^
              lib/ui/subscription.dart:50:20:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                  WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                 ^
              lib/ui/subscription.dart:209:32:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                              WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                             ^
              lib/ui/banners/banners.dart:36:20:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                  WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                 ^
              lib/ui/banners/banners.dart:116:30:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                            WidgetsBinding.instance!.addPostFrameCallback((_) {
                                           ^
              lib/ui/blog/blog.dart:40:20:
              Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
               - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../flutter/packages/flutter/lib/src/widgets/binding.dart').
                  WidgetsBinding.instance!.addPostFrameCallback((_) async {
                                 ^

PS : i have to use an old flutter version to not break the code , this is my actual version of flutter and dart :

        flutter --version
    Flutter 3.7.0 • channel unknown • unknown source
    Framework • revision b06b8b2710 (1 year, 5 months ago) • 2023-01-23 16:55:55 -0800
    Engine • revision b24591ed32
    Tools • Dart 2.19.0 • DevTools 2.20.1

i tried to change many dependencies version but i can’t fix it , any idea how to fix this problem.

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Danh mục

How to fix Flutter dependencies for web build