Fix newly enforce package:pedantic lints (dart-lang/web_socket_channel#91)

- always_declare_return_types
- annotate_overrides
- omit_local_variable_types
- prefer_collection_literals
- prefer_conditional_assignment
- prefer_single_quotes
- use_function_type_syntax_for_parameters
13 files changed
tree: 4d839c8dd92f55c50460efaa23b412e17908ee2c
  1. pkgs/