unnecessary_import

The import of '{0}' is unnecessary because all of the used elements are also provided by the import of '{1}'.

The analyzer produces this diagnostic when an import isn't needed because all of the names that are imported and referenced within the importing library are also visible through another import.

Given a file a.dart that contains the following:

class A {}

And, given a file b.dart that contains the following:

export 'a.dart';

class B {}

The following code produces this diagnostic because the class A, which is imported from a.dart, is also imported from b.dart. Removing the import of a.dart leaves the semantics unchanged:

import 'a.dart';
import 'b.dart';

void f(A a, B b) {}

If the import isn't needed, then remove it.

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