[New rule] prefer-internal-library-imports

[lukepighetti]

If there is an internal library and a developer reaches into it, show a linter warning that they should import the library itself.

• Warns about a potential error (problem)
• Suggests an alternate way of doing something (suggestion)
• Other (please specify:)

Provide 2-3 code examples that this rule will warn about (it will be better if you can provide both good and bad examples):

main.dart

import 'my_file.dart'; // LINT
import 'my_library.dart'; // NO LINT

void main() {
  print(foo);
}

my_file.dart

const foo = 'foo';

my_library.dart

library my_library;

export 'my_file.dart';

Are you willing to submit a pull request to implement this rule?

Not at this time