shelf_packages_handler

• Added package topics to the pubspec file.
• Require Dart 2.17.

• Require Dart 2.14.
• Update the pubspec repository field.

• BREAKING:: Change the signature of the webSocketHandler method's
  onConnection callback. Previously this took an untyped function with either
  one or two parameters. This now requires a ConnectionCallback; a typedef
  taking two parameters. See also #457.
• Add a API usage example.
• Require Dart ^3.5.0.

Note that most clients seeing analysis issues from the above breaking change can
fix it by adding a second parameter to their callback. So, they would change
this:

webSocketHandler((webSocket) {
  webSocket.stream.listen((message) {
    webSocket.sink.add('echo $message');
  });
});

to this:

webSocketHandler((webSocket, _) {
  webSocket.stream.listen((message) {
    webSocket.sink.add('echo $message');
  });
});

• Migrate to null safety.

• Require Dart ^3.3.0.

• Allow the latest (null-safe) version of pkg:shelf.

Breaking changes

• Dropped the dependency on package_resolver.
  • All PackageResolver apis now take a Map<String, Uri> of package name to the base uri for resolving package: uris for that package.
  • Named arguments have been renamed from resolver to packageMap.

• Set max SDK version to <3.0.0, and adjust other dependencies.

• Require Dart SDK 1.22.0
• Support package:async v2

• Fix Strong mode errors with package:shelf v0.7.x

• Allow dependencies on package:shelf v0.7.x