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升级到 dart sdk 2.5.0-stable。运行后pub global run webdev serve web:8081 --auto=refresh --release我得到一个严重的错误。我知道此版本中引入了重大更改，但在阅读更改日志后仍然不知道如何修复它。

[INFO] Building new asset graph completed, took 2.3s
[INFO] Checking for unexpected pre-existing outputs. completed, took 1ms
[INFO] Serving `web` on http://127.0.0.1:8081
[SEVERE] ERROR - 2019-09-12 09:19:11.608930
[SEVERE] Asynchronous error
[SEVERE] type '_WebSocketProtocolTransformer' is not a subtype of type 'StreamTransformer<Uint8List, dynamic>' of 'streamTransformer'
[SEVERE] dart:async                                                       Stream.transform
[SEVERE] package:web_socket_channel/src/copy/web_socket_impl.dart 712:28  new WebSocketImpl.fromSocket
[SEVERE] package:web_socket_channel/src/channel.dart 94:36                new WebSocketChannel
[SEVERE] package:shelf_web_socket/src/web_socket_handler.dart 82:15       WebSocketHandler.handle.<fn>
[SEVERE]
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1 回答 1

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解决了。问题在于 build_runner 和 web_socket_channel。可能是旧版本卡住了。确保两者都具有最新版本后，问题已解决。

web_socket_channel 1.0.15

build_runner：^1.6.9

于 2019-09-12T09:13:25.430 回答