Depend on referenced packages DRT-W1036

DO depend on referenced packages.

When importing a package, add a dependency on it to your pubspec.

Depending explicitly on packages that you reference ensures they will always exist and allows you to put a dependency constraint on them to guard you against breaking changes.

Whether this should be a regular dependency or dev_dependency depends on if it is referenced from a public file (one under either lib or bin), or some other private file.

BAD:

import 'package:a/a.dart';

dependencies:

GOOD:

import 'package:a/a.dart';

dependencies:
  a: ^1.0.0