From f70173654a844102d30c8206596795e64803675e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=94=AF=E7=84=B6?= <weiran.zsd@outlook.com>
Date: Thu, 17 Jun 2021 10:57:19 +0800
Subject: [PATCH] chore: use parser.$parser to check if it's espree

---
 lib/linter/linter.js           |  4 ++-
 lib/rule-tester/rule-tester.js | 45 +++-------------------------------
 2 files changed, 6 insertions(+), 43 deletions(-)

diff --git a/lib/linter/linter.js b/lib/linter/linter.js
index 77682ea9548..82df6a55a95 100644
--- a/lib/linter/linter.js
+++ b/lib/linter/linter.js
@@ -438,7 +438,9 @@ function getDirectiveComments(filename, ast, ruleMapper, warnInlineConfig) {
  * @returns {number} normalized ECMAScript version
  */
 function normalizeEcmaVersion(parser, ecmaVersion) {
-    if (parser === espree) {
+
+    // RuleTester always wraps parser, parser.$parser is the original parser object
+    if ((parser.$parser || parser) === espree) {
         if (ecmaVersion === void 0) {
             return DEFAULT_ECMA_VERSION;
         }
diff --git a/lib/rule-tester/rule-tester.js b/lib/rule-tester/rule-tester.js
index 702a1651c82..9efd2993b5f 100644
--- a/lib/rule-tester/rule-tester.js
+++ b/lib/rule-tester/rule-tester.js
@@ -48,8 +48,7 @@ const
     equal = require("fast-deep-equal"),
     Traverser = require("../../lib/shared/traverser"),
     { getRuleOptionsSchema, validate } = require("../shared/config-validator"),
-    { Linter, SourceCodeFixer, interpolate } = require("../linter"),
-    espree = require("espree");
+    { Linter, SourceCodeFixer, interpolate } = require("../linter");
 
 const ajv = require("../shared/ajv")({ strictDefaults: true });
 
@@ -258,6 +257,7 @@ function defineStartEndAsErrorInTree(ast, visitorKeys) {
 function wrapParser(parser) {
     if (typeof parser.parseForESLint === "function") {
         return {
+            $parser: parser,
             parseForESLint(...args) {
                 const ret = parser.parseForESLint(...args);
 
@@ -267,6 +267,7 @@ function wrapParser(parser) {
         };
     }
     return {
+        $parser: parser,
         parse(...args) {
             const ast = parser.parse(...args);
 
@@ -529,46 +530,6 @@ class RuleTester {
 
             linter.defineParser(config.parser, wrapParser(require(config.parser)));
 
-            /*
-             * RuleTester always wraps parser, so Linter can't know whether or not it's espree.
-             * Therefore, RuleTester has to duplicate Linter's espree-specific normalizations.
-             */
-            if (
-                config.parser === espreePath &&
-                (
-                    typeof config.parserOptions === "undefined" ||
-                    typeof config.parserOptions === "object" && config.parserOptions !== null
-                )
-            ) {
-                const ecmaVersion = config.parserOptions && config.parserOptions.ecmaVersion;
-
-                if (
-                    typeof ecmaVersion === "undefined" &&
-                    !(
-
-                        // skip if an environment sets ecmaVersion, because parserOptions.ecmaVersion has precedence
-                        typeof config.env === "object" && config.env !== null &&
-                        Object.keys(config.env).some(
-                            envName => config.env[envName] && /^es\d+/u.test(envName)
-                        )
-                    )
-                ) {
-                    config = merge(config, {
-                        parserOptions: {
-                            ecmaVersion: 5
-                        }
-                    });
-                }
-
-                if (ecmaVersion === "latest") {
-                    config = merge(config, {
-                        parserOptions: {
-                            ecmaVersion: espree.latestEcmaVersion
-                        }
-                    });
-                }
-            }
-
             if (schema) {
                 ajv.validateSchema(schema);