如何从 flutter 1.22.4 稳定版升级 dart sdk?

How can I upgrade the dart sdk from flutter 1.22.4 stable channel?

我正在为项目使用 flutter 1.22.4 稳定版。在此 sdk 中集成了 dart 2.10.0 sdk。现在我想将 dart sdk 升级到 2.12.0。我该怎么做?

升级到flutter 2.0,dart版本切换到2.12。这里是How To Upgrade Your Mobile App to Flutter 2.0+ and How to Migrate Your Mobile App to Flutter 2.0

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