[pkg:js] Enable pedantic lints

Change-Id: Ia03a68431d3e62f2b5db45d3c38fb99f5ab07ca6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/151540
Auto-Submit: Kevin Moore <kevmoo@google.com>
Reviewed-by: Nate Bosch <nbosch@google.com>
Commit-Queue: Nate Bosch <nbosch@google.com>

pkg/js/analysis_options.yaml

@@ -1,3 +1,47 @@
+include: package:pedantic/analysis_options.yaml
+
 analyzer:
+  strong-mode:
+    implicit-casts: false
   enable-experiment:
     - non-nullable
+
+linter:
+  rules:
+  - avoid_empty_else
+  - avoid_init_to_null
+  - avoid_null_checks_in_equality_operators
+  - avoid_unused_constructor_parameters
+  - await_only_futures
+  - camel_case_types
+  - cancel_subscriptions
+  - constant_identifier_names
+  - control_flow_in_finally
+  - directives_ordering
+  - empty_catches
+  - empty_constructor_bodies
+  - empty_statements
+  - hash_and_equals
+  - implementation_imports
+  - iterable_contains_unrelated_type
+  - library_names
+  - library_prefixes
+  - list_remove_unrelated_type
+  - non_constant_identifier_names
+  - overridden_fields
+  - package_api_docs
+  - package_names
+  - package_prefixed_library_names
+  - prefer_equal_for_default_values
+  - prefer_final_fields
+  - prefer_generic_function_type_aliases
+  - prefer_is_not_empty
+  - slash_for_doc_comments
+  - test_types_in_equals
+  - throw_in_finally
+  - type_init_formals
+  - unnecessary_brace_in_string_interps
+  - unnecessary_const
+  - unnecessary_new
+  - unrelated_type_equality_checks
+  - valid_regexps

pkg/js/pubspec.yaml

@@ -5,3 +5,6 @@ homepage: https://github.com/dart-lang/sdk/tree/master/pkg/js
 
 environment:
   sdk: '>=2.9.0-1 <3.0.0'
+
+dev_dependencies:
+  pedantic: ^1.9.0