import_of_legacy_library_into_null_safe

The library '{0}' is legacy, and shouldn't be imported into a null safe library.

The analyzer produces this diagnostic when a library that is null safe imports a library that isn't null safe.

Given a file a.dart that contains the following:

// @dart = 2.9

class A {}

The following code produces this diagnostic because a library that null safe is importing a library that isn't null safe:

import 'a.dart';

A? f() => null;

If you can migrate the imported library to be null safe, then migrate it and update or remove the migrated library's language version.

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