fix: avoid-global-state to support static fields (#644)

* fix: `avoid-global-state` to support static fields

* fix: static field with final and const modification

* fix: test example

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+* fix: `avoid-global-state` to support static fields.
 * feat: support excludes for a separate anti-pattern.
 * fix: prefer-extracting-callbacks in nested widgets.
 * fix: correctly handle method invocations on getters and method of for `check-unused-l10n` command.

lib/src/analyzers/lint_analyzer/rules/rules_list/avoid_global_state/visitor.dart

@@ -9,10 +9,16 @@ class _Visitor extends RecursiveAstVisitor<void> {
   void visitVariableDeclaration(VariableDeclaration node) {
     super.visitVariableDeclaration(node);
 
-    if (!node.isFinal &&
-        !node.isConst &&
-        node.declaredElement?.enclosingElement is CompilationUnitElement) {
-      _declarations.add(node);
+    if (node.declaredElement?.enclosingElement is CompilationUnitElement) {
+      if (!node.isFinal && !node.isConst) {
+        _declarations.add(node);
+      }
+    } else {
+      if ((node.declaredElement?.isStatic ?? false) &&
+          !node.isFinal &&
+          !node.isConst) {
+        _declarations.add(node);
+      }
     }
   }
 }

test/src/analyzers/lint_analyzer/rules/rules_list/avoid_global_state/avoid_global_state_rule_test.dart

@@ -25,15 +25,19 @@ void main() {
 
       RuleTestHelper.verifyIssues(
         issues: issues,
-        startLines: [1, 2],
-        startColumns: [5, 5],
+        startLines: [1, 2, 10, 11],
+        startColumns: [5, 5, 15, 18],
         locationTexts: [
           'answer = 42',
           'evenNumbers = [1, 2, 3].where((element) => element.isEven)',
+          'a',
+          'c',
         ],
         messages: [
           'Avoid using global variable without const or final keywords.',
           'Avoid using global variable without const or final keywords.',
+          'Avoid using global variable without const or final keywords.',
+          'Avoid using global variable without const or final keywords.',
         ],
       );
     });

test/src/analyzers/lint_analyzer/rules/rules_list/avoid_global_state/examples/example.dart

@@ -2,13 +2,16 @@ var answer = 42; // LINT
 var evenNumbers = [1, 2, 3].where((element) => element.isEven); // LINT
 const a = 1;
 final b = 1;
+const noted2 = '';
 
 void function() {}
 
 class Foo {
-  static int? a;
+  static int? a; // LINT
+  static dynamic c; // LINT
   final int? b;
-  dynamic c;
+  dynamic c2;
   const d = 1;
+  static const noted = '';
   void function() {}
 }