From 538165557c9ab3a0558fcc5112750edbb9c8b3f0 Mon Sep 17 00:00:00 2001
From: Mathias Schreck <schreck.mathias@googlemail.com>
Date: Wed, 26 May 2021 16:38:11 +0200
Subject: [PATCH] Improve no-nested-tests performance

---
 lib/rules/no-nested-tests.js | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/lib/rules/no-nested-tests.js b/lib/rules/no-nested-tests.js
index e623604..e554fb9 100644
--- a/lib/rules/no-nested-tests.js
+++ b/lib/rules/no-nested-tests.js
@@ -15,6 +15,8 @@ module.exports = {
         const astUtils = createAstUtils(context.settings);
         let testNestingLevel = 0;
         let hookCallNestingLevel = 0;
+        const isTestCase = astUtils.buildIsTestCaseAnswerer();
+        const isDescribe = astUtils.buildIsDescribeAnswerer();
 
         function report(callExpression, message) {
             context.report({
@@ -23,26 +25,26 @@ module.exports = {
             });
         }
 
-        function isNestedTest(isTestCase, isDescribe, nestingLevel) {
+        function isNestedTest(_isTestCase, _isDescribe, nestingLevel) {
             const isNested = nestingLevel > 0;
-            const isTest = isTestCase || isDescribe;
+            const isTest = _isTestCase || _isDescribe;
 
             return isNested && isTest;
         }
 
         function checkForAndReportErrors(
             node,
-            isTestCase,
-            isDescribe,
+            _isTestCase,
+            _isDescribe,
             isHookCall
         ) {
-            if (isNestedTest(isTestCase, isDescribe, testNestingLevel)) {
-                const message = isDescribe ?
+            if (isNestedTest(_isTestCase, _isDescribe, testNestingLevel)) {
+                const message = _isDescribe ?
                     'Unexpected suite nested within a test.' :
                     'Unexpected test nested within another test.';
                 report(node, message);
             } else if (
-                isNestedTest(isTestCase, isHookCall, hookCallNestingLevel)
+                isNestedTest(_isTestCase, isHookCall, hookCallNestingLevel)
             ) {
                 const message = isHookCall ?
                     'Unexpected test hook nested within a test hook.' :
@@ -53,18 +55,18 @@ module.exports = {
 
         return {
             CallExpression(node) {
-                const isTestCase = astUtils.isTestCase(node);
+                const _isTestCase = isTestCase(node);
                 const isHookCall = astUtils.isHookCall(node);
-                const isDescribe = astUtils.isDescribe(node);
+                const _isDescribe = isDescribe(node);
 
                 checkForAndReportErrors(
                     node,
-                    isTestCase,
-                    isDescribe,
+                    _isTestCase,
+                    _isDescribe,
                     isHookCall
                 );
 
-                if (isTestCase) {
+                if (_isTestCase) {
                     testNestingLevel += 1;
                 } else if (isHookCall) {
                     hookCallNestingLevel += 1;
@@ -72,7 +74,7 @@ module.exports = {
             },
 
             'CallExpression:exit'(node) {
-                if (astUtils.isTestCase(node)) {
+                if (isTestCase(node)) {
                     testNestingLevel -= 1;
                 } else if (astUtils.isHookCall(node)) {
                     hookCallNestingLevel -= 1;