Auto importing dart:html

[rlee1990]

Flutter keeps auto importing dart:html when I try to use a Text widget. I am using VsCode.

Flutter Doctor:

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[devoncarew]

I think we'll want to do one of either:

• manually reduce the suggestion order of items from dart:html when writing a Flutter app, or
• ensure that the statistics of import usage naturally lead to a lower heuristic for dart:html types

cc @pq @bwilkerson @jwren

[bwilkerson]

When the code completion engine decides whether to suggest names defined in other not-yet-imported libraries, it can use the declared package dependencies to do so. We don't have quite the same information available for core libraries, but maybe there's a mapping we can make from the SDK (Dart vs. Flutter) to control the availability of them.

[tomasbaran]

Same here:

I just always end up deleting import 'dart:html';. Then I rerun the app and the same thing repeats over but on random basis.

I also now notice that it also adds other imports by itself without me knowing about it.

import 'dart:async';

But dart:async doesn't give me an error saying "Not found.

(content deleted for brevity)

[  +32 ms] executing: [/Users/tomas/Developer/flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[  +52 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] b8bd09db210d2c6299555643af8db4b8ff3e8d92
[        ] executing: [/Users/tomas/Developer/flutter/] git describe --match *.*.* --first-parent --long --tags

...

#0      throwToolExit (package:flutter_tools/src/base/common.dart:14:3)
#1      RunCommand.validateCommand (package:flutter_tools/src/commands/run.dart:337:7)
<asynchronous suspension>
#2      FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:725:11)
<asynchronous suspension>
#3      FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:642:33)
<asynchronous suspension>
#4      FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart)
#5      AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:150:29)
#6      _rootRun (dart:async/zone.dart:1184:13)
#7      _CustomZone.run (dart:async/zone.dart:1077:19)
#8      _runZoned (dart:async/zone.dart:1619:10)
#9      runZoned (dart:async/zone.dart:1539:10)
#10     AppContext.run (package:flutter_tools/src/base/context.dart:149:18)
#11     FlutterCommand.run (package:flutter_tools/src/runner/flutter_command.dart:632:20)
#12     CommandRunner.runCommand (package:args/command_runner.dart:197:27)
#13     FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:340:21)
#14     _rootRunUnary (dart:async/zone.dart:1192:38)
#15     _CustomZone.runUnary (dart:async/zone.dart:1085:19)
#16     _FutureListener.handleValue (dart:async/future_impl.dart:141:18)
#17     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#18     Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#19     Future._completeWithValue (dart:async/future_impl.dart:526:5)
#20     _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:36:15)
#21     _completeOnAsyncReturn (dart:async-patch/async_patch.dart:303:13)
#22     FlutterVersion.checkFlutterVersionFreshness (package:flutter_tools/src/version.dart)
#23     _rootRunUnary (dart:async/zone.dart:1192:38)
#24     _CustomZone.runUnary (dart:async/zone.dart:1085:19)
#25     _FutureListener.handleValue (dart:async/future_impl.dart:141:18)
#26     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:682:45)
#27     Future._propagateToListeners (dart:async/future_impl.dart:711:32)
#28     Future._completeWithValue (dart:async/future_impl.dart:526:5)
#29     Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:556:7)
#30     _rootRun (dart:async/zone.dart:1184:13)
#31     _CustomZone.run (dart:async/zone.dart:1077:19)
#32     _CustomZone.runGuarded (dart:async/zone.dart:979:7)
#33     _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:1019:23)
#34     _microtaskLoop (dart:async/schedule_microtask.dart:43:21)
#35     _startMicrotaskLoop (dart:async/schedule_microtask.dart:52:5)
#36     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:118:13)
#37     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:169:5)

 info • The value of the local variable 'placemark' isn't used • lib/screens/loading_screen.dart:17:21 • unused_local_variable
   info • Avoid using web-only libraries outside Flutter web plugin packages • lib/screens/my_city_screen.dart:2:1 • avoid_web_libraries_in_flutter
   info • Unused import: 'package:Sundee/screens/location_denied.dart' • lib/screens/my_city_screen.dart:4:8 • unused_import

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[✓] Connected device (5 available)
    • iPhone            • 00008020-000415840E50003A            • ios            • iOS 13.3.1
    • iPhone 11 Pro     • A85E0A78-987E-41EA-9676-E33AC01D746D • ios            • com.apple.CoreSimulator.SimRuntime.iOS-13-4 (simulator)
    • iPhone 11 Pro Max • 29AAAD23-5952-417E-A4F1-4763923FDA6C • ios            • com.apple.CoreSimulator.SimRuntime.iOS-13-4 (simulator)
    • Chrome            • chrome                               • web-javascript • Google Chrome 81.0.4044.122
    • Web Server        • web-server                           • web-javascript • Flutter Tools

• No issues found!

[cth00]

Same issue here, along with my 3 friends facing this issue.

[pq]

Thanks for the feedback (and sorry for the continued hassle). Tracking on the SDK here: #41641.

[DanTup]

This came up in Dart-Code/Dart-Code#3265 (comment) too, and Eric made an interesting comment about non-Flutter code. It reminded me that I've accidentally imported dart:html (quite a lot, actually) into a CLI project I have (a static website generator - which has a lot of overlap with class names that are also in dart:html).

So it may be advantageous for the solution to not be Flutter-specific/based on the SDK type, but something that can be opted-in to pure CLI projects too.

(I just found there's a lint avoid_web_libraries_in_flutter and wonder whether a less Flutter-specific version would work - and perhaps could be used to filter the completion?)