tools: update ESLint to 7.6.0

Update ESLint to 7.6.0

PR-URL: https://github.com/nodejs/node/pull/34589
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

tools/node_modules/eslint/README.md

@@ -122,7 +122,7 @@ Yes, ESLint natively supports parsing JSX syntax (this must be enabled in [confi
 
 ### What ECMAScript versions does ESLint support?
 
-ESLint has full support for ECMAScript 3, 5 (default), 2015, 2016, 2017, 2018, and 2019. You can set your desired ECMAScript syntax (and other settings, like global variables or your target environments) through [configuration](https://eslint.org/docs/user-guide/configuring).
+ESLint has full support for ECMAScript 3, 5 (default), 2015, 2016, 2017, 2018, 2019, and 2020. You can set your desired ECMAScript syntax (and other settings, like global variables or your target environments) through [configuration](https://eslint.org/docs/user-guide/configuring).
 
 ### What about experimental features?
 
@@ -256,7 +256,7 @@ The following companies, organizations, and individuals support ESLint's ongoing
 <h3>Gold Sponsors</h3>
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 <!--sponsorsend-->
 
 ## <a name="technology-sponsors"></a>Technology Sponsors

tools/node_modules/eslint/lib/cli-engine/formatters/checkstyle.js

@@ -42,8 +42,8 @@ module.exports = function(results) {
 
         messages.forEach(message => {
             output += [
-                `<error line="${xmlEscape(message.line)}"`,
-                `column="${xmlEscape(message.column)}"`,
+                `<error line="${xmlEscape(message.line || 0)}"`,
+                `column="${xmlEscape(message.column || 0)}"`,
                 `severity="${xmlEscape(getMessageType(message))}"`,
                 `message="${xmlEscape(message.message)}${message.ruleId ? ` (${message.ruleId})` : ""}"`,
                 `source="${message.ruleId ? xmlEscape(`eslint.rules.${message.ruleId}`) : ""}" />`

tools/node_modules/eslint/lib/rule-tester/rule-tester.js

@@ -861,6 +861,16 @@ class RuleTester {
                 );
             }
 
+            // Rules that produce fixes must have `meta.fixable` property.
+            if (result.output !== item.code) {
+                assert.ok(
+                    hasOwnProperty(rule, "meta"),
+                    "Fixable rules should export a `meta.fixable` property."
+                );
+
+                // Linter throws if a rule that produced a fix has `meta` but doesn't have `meta.fixable`.
+            }
+
             assertASTDidntChange(result.beforeAST, result.afterAST);
         }
 

tools/node_modules/eslint/lib/rules/no-duplicate-case.js

@@ -6,6 +6,12 @@
 
 "use strict";
 
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
 //------------------------------------------------------------------------------
 // Rule Definition
 //------------------------------------------------------------------------------
@@ -31,18 +37,31 @@ module.exports = {
     create(context) {
         const sourceCode = context.getSourceCode();
 
+        /**
+         * Determines whether the two given nodes are considered to be equal.
+         * @param {ASTNode} a First node.
+         * @param {ASTNode} b Second node.
+         * @returns {boolean} `true` if the nodes are considered to be equal.
+         */
+        function equal(a, b) {
+            if (a.type !== b.type) {
+                return false;
+            }
+
+            return astUtils.equalTokens(a, b, sourceCode);
+        }
         return {
             SwitchStatement(node) {
-                const previousKeys = new Set();
+                const previousTests = [];
 
                 for (const switchCase of node.cases) {
                     if (switchCase.test) {
-                        const key = sourceCode.getText(switchCase.test);
+                        const test = switchCase.test;
 
-                        if (previousKeys.has(key)) {
+                        if (previousTests.some(previousTest => equal(previousTest, test))) {
                             context.report({ node: switchCase, messageId: "unexpected" });
                         } else {
-                            previousKeys.add(key);
+                            previousTests.push(test);
                         }
                     }
                 }

tools/node_modules/eslint/messages/extend-config-missing.txt

@@ -2,4 +2,4 @@ ESLint couldn't find the config "<%- configName %>" to extend from. Please check
 
 The config "<%- configName %>" was referenced from the config file in "<%- importerName %>".
 
-If you still have problems, please stop by https://eslint.org/chat to chat with the team.
+If you still have problems, please stop by https://eslint.org/chat/help to chat with the team.

tools/node_modules/eslint/messages/no-config-found.txt

@@ -4,4 +4,4 @@ ESLint couldn't find a configuration file. To set up a configuration file for th
 
 ESLint looked for configuration files in <%= directoryPath %> and its ancestors. If it found none, it then looked in your home directory.
 
-If you think you already have a configuration file or if you need more help, please stop by the ESLint chat room: https://eslint.org/chat
+If you think you already have a configuration file or if you need more help, please stop by the ESLint chat room: https://eslint.org/chat/help

tools/node_modules/eslint/messages/plugin-conflict.txt

@@ -4,4 +4,4 @@ ESLint couldn't determine the plugin "<%- pluginId %>" uniquely.
 
 Please remove the "plugins" setting from either config or remove either plugin installation.
 
-If you still can't figure out the problem, please stop by https://eslint.org/chat to chat with the team.
+If you still can't figure out the problem, please stop by https://eslint.org/chat/help to chat with the team.

tools/node_modules/eslint/messages/plugin-missing.txt

@@ -8,4 +8,4 @@ It's likely that the plugin isn't installed correctly. Try reinstalling by runni
 
 The plugin "<%- pluginName %>" was referenced from the config file in "<%- importerName %>".
 
-If you still can't figure out the problem, please stop by https://eslint.org/chat to chat with the team.
+If you still can't figure out the problem, please stop by https://eslint.org/chat/help to chat with the team.

tools/node_modules/eslint/messages/whitespace-found.txt

@@ -1,3 +1,3 @@
 ESLint couldn't find the plugin "<%- pluginName %>". because there is whitespace in the name. Please check your configuration and remove all whitespace from the plugin name.
 
-If you still can't figure out the problem, please stop by https://eslint.org/chat to chat with the team.
+If you still can't figure out the problem, please stop by https://eslint.org/chat/help to chat with the team.

tools/node_modules/eslint/package.json

@@ -153,5 +153,5 @@
     "test:cli": "mocha",
     "webpack": "node Makefile.js webpack"
   },
-  "version": "7.5.0"
+  "version": "7.6.0"
 }