我迁移到了null safety，运行"flutter pub run build_runner build“时不会抛出一个错误
我迁移到了null safety，运行"flutter pub run build_runner build“时不会抛出一个错误
提问于 2021-02-07 23:12:21
我已经将// @dart=2.9添加到我的所有文件中，但是如果不抛出这个错误，build_runner将无法完成它的工作：
Warning: Operand of null-aware operation '?.' has type 'SendPort' which excludes null. - 'SendPort' is from 'dart:isolate'. sendPort?.send(result); ^Error: Cannot run with sound null safety, because the following dependencies don't support null safety:
- package:build_runner_core
- package:json_serializable
- package:moor_generator
- package:objectbox_generator
- package:retrofit_generator
- package:source_gen
- package:build_config
- package:build_runner
- package:build
- package:json_annotation
- package:glob
- package:pool
- package:crypto
- package:logging
- package:watcher
- package:build_resolvers
- package:timing
- package:graphs
- package:package_config
- package:yaml
- package:analyzer
- package:sqlparser
- package:objectbox
- package:dart_style
- package:built_collection
- package:code_builder
- package:dio
- package:tuple
- package:retrofit
- package:pedantic
- package:checked_yaml
- package:pubspec_parse
- package:build_daemon
- package:args
- package:io
- package:convert
- package:pub_semver
- package:ffi
- package:quiver
- package:moor
- package:recase
- package:_fe_analyzer_shared
- package:built_value
- package:http_parser
- package:http_multi_server
- package:shelf
- package:stream_transform
- package:mime
- package:shelf_web_socket
- package:web_socket_channel
- package:cli_util
- package:fixnum
- package:synchronizedFor solutions, see https://dart.dev/go/unsound-null-safety.dart_tool/build/entrypoint/build.dart:44:44: Error: The parameter 'sendPort' can't have a value of 'null' because of its type 'SendPort', but the implicit default value is 'null'. - 'SendPort' is from 'dart:isolate'.Try adding either an explicit non-'null' default value or the 'required' modifier.void main(List<String> args, [_i8.SendPort sendPort]) async { 回答 3
Stack Overflow用户
发布于 2021-04-16 05:26:28
请确保您的所有包都更新到了各自的空安全版本。对于build runner，使用^1.12.2，然后在当前工作目录中在终端中运行下面的命令。
flutter clean
flutter pub cache repair
flutter pub run build_runner clean
flutter pub get然后运行build runner命令。
这对我很有效，我已经使用构建运行器成功地生成了文件。
Stack Overflow用户
发布于 2021-04-16 18:07:37
删除flutter文件夹中的.pub-cache文件夹，然后运行pub upgrade，之后您应该可以运行：
flutter packages pub run build_runner build --delete-conflicting-outputsStack Overflow用户
发布于 2021-05-17 00:23:26
对于那些正在使用完整的声音零安全的人，即没有使用@dart=2.9或其他方法来忽略零安全的人。
在您的pubspec.yaml文件中，较低版本的SDK应该是>=2.12。
environment:
sdk: '>=2.12.0 <3.0.0'使用以下版本(所有版本都是空安全的)
json_annotation: ^4.0.1
json_serializable: ^4.1.2
build_runner: ^2.0.3页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/66089455
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