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並前往https://dart.dev/null-safety/migration-guide

Migrating to null safety - Dart programming language

For example, the Dart and Flutter core libraries are null safe, and they're still ... Run dart pub upgrade --null-safety to upgrade to the latest versions ...

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查詢 「Flutter upgrade」的人也找了：

  1. Flutter SDK version update
    2.
  2. Dart upgrade
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  3. Flutter pub upgrade
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  4. Flutter version
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  5. Flutter SDK path
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  6. Flutter upgrade to specific version
    7.
  7. Flutter downgrade
    8.
  8. Flutter package upgrade
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