[BUG] Project does not compile to web using 7+ version (worked fine before)

[LeGoffMael]

Describe the bug

Project does not compile in web using 7.0.1.
It worked fine with <7 version. There is no problem on mobile.

It looks like it is related to live pictures and extended_image_library.

Tested and found in both 7.0.0 and 7.0.1.

How to reproduce

Steps to reproduce the behavior:

1. Add this plugin (wechat_assets_picker: ^7.0.1) to pubspec.yaml
2. Start debugging to chrome.
3. Failed to compile application. error message in the log

Expected behavior

Even if this plugin does not support web, project should be able to compile for web env normally, like in previous version.

Version information

• Device: Chrome
• OS: Macbook pro (intel chip)
• Package Version: 7.0.1
• Flutter Version: 2.10.3

Additional context

Launching lib[/main.dart]() on Chrome in debug mode...
libmain.dart:1
: Error: A value of type 'File*1*?' can't be assigned to a variable of type 'File*2*?'.
..…builderimage_page_builder.dart:53
 - 'File/*1*/' is from 'dart:io'.
- 'File/*2*/' is from 'package:extended_image_library[/src/_platform_web.dart]()' ('.[./../../.pub-cache/hosted/pub.dartlang.org/extended_image_library-3.1.2/lib/src/_platform_web.dart]()').
package:extended_image_librarysrc_platform_web.dart:1
      file = await widget.asset.originFileWithSubtype;

             ^
: Error: A value of type 'File*1*?' can't be assigned to a variable of type 'File*2*?'.
..…builder/image_page_builder.dart:55
 - 'File/*1*/' is from 'dart:io'.
- 'File/*2*/' is from 'package:extended_image_library[/src/_platform_web.dart]()' ('.[./../../.pub-cache/hosted/pub.dartlang.org/extended_image_library-3.1.2/lib/src/_platform_web.dart]()').
package:extended_image_librarysrc_platform_web.dart:1
      file = await widget.asset.fileWithSubtype;
             ^

: Error: The argument type 'File*1*' can't be assigned to the parameter type 'File*2*'.
../…/builder/image_page_builder.dart:61
- 'File/*1*/' is from 'package:extended_image_library[/src/_platform_web.dart]()' ('.[./../../.pub-cache/hosted/pub.dartlang.org/extended_image_library-3.1.2/lib/src/_platform_web.dart]()').
package:extended_image_librarysrc_platform_web.dart:1

 - 'File/*2*/' is from 'dart:io'.
      file,
      ^

Failed to compile application.
Exited (sigterm)

[AlexV525]

We didn't support the Web platform. Duplicate with #227.

[LeGoffMael]

Yes you're right but they were no problem with previous version 6.3.1.

[AlexV525]

It's not about whether the path is working, but whether it's valid. We don't guarantee any invalid usage.

[LeGoffMael]

I see, in such case it sounds like a Breaking change isn't it, project configuration must be updated from 7+ version since compilation will failed in web. Which was not the case before.

I will check what i must change in my configuration. Thank you for the quick reply.

[AlexV525]

in such case it sounds like a Breaking change isn't it

Not really. We've already been using the extended_image long ago, and according to #227, it's not related to v7.x, so it's not a breaking change.

[LeGoffMael]

After further investigation, you're absolutely right, this error occurs before v7, it is not a breaking change.

I need to found out how i've been able to compile to web since a month without a problem until the update 🤔.

Thank you again for your time.

[AlexV525]

You can file issues against the extended image library, that would be more reasonable.

[LeGoffMael]

If someone is facing the same issue, here is how i fixed it in my case:

Avoid error

avoid:

import 'package:wechat_assets_picker/wechat_assets_picker.dart';

try being the most accurate possible (i.e: package:wechat_assets_picker/src/delegates/asset_picker_text_delegate.dart) or use package:photo_manager/photo_manager.dart if possible.

Fix error

in the case you need to import all wechat_assets_picker package or a file that causes the error, you will need to use conditional import.

import 'package:wechat_assets_picker/wechat_assets_picker.dart'
    if (dart.library.html) 'package:my_app/whatever_filename.dart';

in whatever_filename.dart:

/// export `photo_manager` to avoid not found error while compiling in web
export 'package:photo_manager/photo_manager.dart';
// add all needed files that does not causes the error
export 'package:wechat_assets_picker/src/constants/config.dart';

/// Add dumb classes to import for web instead of `wechat_assets_picker` to be able to compile
class AssetPicker {
  static Future<Null> pickAssets(_, {pickerConfig}) async => null;
}

[AlexV525]

Discussed with @zmtzawqlp offline, we have some class conflicts here. Reopen for applying fixes.