Drop unneeded dep on pkg:test (dart-archive/sse#98)

And added a script to rebuild the test file
And rebuilt the script file
and tiny cleanup to .gitignore

Author: kevmoo

pkgs/sse/.gitignore

@@ -1,3 +1,3 @@
 .dart_tool
-.packages
 pubspec.lock
+test/web/index.dart.js.deps

pkgs/sse/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 4.1.5-wip
+
+- Drop unneeded dependency on `package:js`.
+
 ## 4.1.4
 
 - Fix incorrect cast causing failure with `dart2wasm`.

pkgs/sse/analysis_options.yaml

@@ -7,7 +7,6 @@ analyzer:
 
 linter:
   rules:
-    - avoid_returning_null
     - avoid_unused_constructor_parameters
     - cancel_subscriptions
     - literal_only_boolean_expressions

pkgs/sse/pubspec.yaml

@@ -1,5 +1,5 @@
 name: sse
-version: 4.1.4
+version: 4.1.5-wip
 description: >-
   Provides client and server functionality for setting up bi-directional
   communication through Server Sent Events (SSE) and corresponding POST
@@ -12,7 +12,6 @@ environment:
 dependencies:
   async: ^2.0.8
   collection: ^1.0.0
-  js: ^0.6.4
   logging: ^1.0.0
   pool: ^1.5.0
   shelf: ^1.1.0