enable the avoid_dynamic_calls lint

CHANGELOG.md

@@ -3,6 +3,7 @@
 - Add optional `signIn` argument to `startWithDebugPort`.
   To be used together with `user-data-dir` to start a chrome
   window signed into the default profile with extensions enabled.
+- Enable the `avoid_dynamic_calls` lint.
 
 ## 1.0.0
 

analysis_options.yaml

@@ -7,6 +7,7 @@ analyzer:
 linter:
   rules:
     - always_declare_return_types
+    - avoid_dynamic_calls
     - avoid_unused_constructor_parameters
     - cancel_subscriptions
     - directives_ordering

test/chrome_test.dart

@@ -138,7 +138,8 @@ Future<String> _evaluateExpression(WipPage page, String expression) async {
       'Runtime.evaluate',
       params: {'expression': expression},
     );
-    var value = wipResponse.json['result']['result']['value'];
+    var response = wipResponse.json['result'] as Map<String, dynamic>;
+    var value = (response['result'] as Map<String, dynamic>)['value'];
     result = (value != null && value is String) ? value : '';
   }
   return result;