Convert eslint-plugin-test-rules/index.js to Typescript

Fixes #576

Convert `eslint-plugin-test-rules/index.js` to TypeScript.

* Rename `eslint-plugin-test-rules/index.js` to `eslint-plugin-test-rules/index.ts`.
* Update `module.exports` to `export` and add TypeScript types for ESLint rule creation.
* Modify rule creation function to use TypeScript syntax.
* Update `eslint-plugin-test-rules/package.json` to reference `index.ts` instead of `index.js`.

---

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eslint-plugin-test-rules/index.ts

@@ -0,0 +1,53 @@
+import { Rule } from 'eslint';
+import { RuleMeta } from '../.eslintrc-custom-rules';
+
+interface RuleDefinition {
+  meta: RuleMeta;
+  create: (context: Rule.RuleContext) => Rule.RuleListener;
+}
+
+export const configs = {
+  recommended: {
+    plugins: ['test-rules'],
+    rules: {
+      'test-rules/arrange-act-assert': 'error'
+    }
+  }
+};
+
+export const rules: { [key: string]: RuleDefinition } = {
+  'arrange-act-assert': {
+    meta: {
+      type: 'suggestion',
+      docs: {
+        description: 'enforce AAA pattern in tests',
+        category: 'Best Practices',
+        recommended: true
+      },
+      schema: [] // no options
+    },
+    create(context) {
+      return {
+        CallExpression(node) {
+          if (node.callee.name === 'it' || node.callee.name === 'test') {
+            const testFn = node.arguments[1];
+            if (testFn && testFn.type === 'ArrowFunctionExpression') {
+              const comments = context.getSourceCode().getCommentsBefore(testFn.body);
+              const hasAAA = comments.some(comment => 
+                comment.value.includes('Arrange') ||
+                comment.value.includes('Act') ||
+                comment.value.includes('Assert')
+              );
+              if (!hasAAA) {
+                context.report({
+                  node,
+                  message: 'Test should follow AAA pattern with comments'
+                });
+              }
+            }
+          }
+        }
+      };
+    }
+  }
+};

eslint-plugin-test-rules/package.json

@@ -2,7 +2,7 @@
   "name": "eslint-plugin-test-rules",
   "version": "1.0.0",
   "description": "Custom ESLint rules for testing",
-  "main": "index.js",
+  "main": "index.ts",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },