The Software
As of Flutter 1.21, the Flutter SDK includes the full Dart SDK. So, if you have Flutter installed, you might not need to explicitly download the Dart SDK.
Installing the Flutter SDK
Consider downloading the Dart SDK if any of the following are true:
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You don’t use Flutter.
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You use a pre-1.21 version of Flutter.
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You want to reduce disk space requirements or download time, and your use case doesn’t require Flutter. For example, you might have a continuous integration (CI) setup that requires Dart but not Flutter.