feat: Support ES2025 and RegExp duplicate named capturing groups

README.md

@@ -141,7 +141,7 @@ const options = {
     tokens: false,
 
     // Set to 3, 5 (the default), 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15 to specify the version of ECMAScript syntax you want to use.
-    // You can also set to 2015 (same as 6), 2016 (same as 7), 2017 (same as 8), 2018 (same as 9), 2019 (same as 10), 2020 (same as 11), 2021 (same as 12), 2022 (same as 13), 2023 (same as 14) or 2024 (same as 15) to use the year-based naming.
+    // You can also set to 2015 (same as 6), 2016 (same as 7), 2017 (same as 8), 2018 (same as 9), 2019 (same as 10), 2020 (same as 11), 2021 (same as 12), 2022 (same as 13), 2023 (same as 14), 2024 (same as 15) or 2025 (same as 16) to use the year-based naming.
     // You can also set "latest" to use the most recently supported version.
     ecmaVersion: 3,
 
@@ -231,11 +231,12 @@ We are building on top of Acorn, however, so that we can contribute back and hel
 
 ### What ECMAScript features do you support?
 
-Espree supports all ECMAScript 2023 features and partially supports ECMAScript 2024 features.
+Espree supports all ECMAScript 2023 features and partially supports ECMAScript 2024 and ECMAScript 2025 features.
 
-Because ECMAScript 2024 is still under development, we are implementing features as they are finalized. Currently, Espree supports:
+Because ECMAScript 2024 and ECMAScript 2025 are still under development, we are implementing features as they are finalized. Currently, Espree supports:
 
 * [RegExp v flag with set notation + properties of strings](https://github.com/tc39/proposal-regexp-v-flag)
+* [RegExp Duplicate named capturing groups](https://github.com/tc39/proposal-duplicate-named-capturing-groups)
 
 See [finished-proposals.md](https://github.com/tc39/proposals/blob/master/finished-proposals.md) to know what features are finalized.
 

lib/options.js

@@ -19,7 +19,8 @@ const SUPPORTED_VERSIONS = [
     12, // 2021
     13, // 2022
     14, // 2023
-    15 // 2024
+    15, // 2024
+    16 // 2025
 ];
 
 /**

package.json

@@ -32,7 +32,7 @@
   "funding": "https://opencollective.com/eslint",
   "license": "BSD-2-Clause",
   "dependencies": {
-    "acorn": "^8.11.3",
+    "acorn": "^8.12.0",
     "acorn-jsx": "^5.3.2",
     "eslint-visitor-keys": "^4.0.0"
   },

tests/fixtures/ecma-version/16/duplicate-named-capturing-groups/invalid-duplicate-named-capturing-groups-with-disjunction.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 13,
+    "lineNumber": 1,
+    "column": 14,
+    "message": "Invalid regular expression: /(?<x>a)|(?<x>b)(?<x>c)/: Duplicate capture group name"
+};

tests/fixtures/ecma-version/16/duplicate-named-capturing-groups/invalid-duplicate-named-capturing-groups-with-disjunction.src.js

@@ -0,0 +1 @@
+const re1 = /(?<x>a)|(?<x>b)(?<x>c)/;

tests/fixtures/ecma-version/16/duplicate-named-capturing-groups/invalid-duplicate-named-capturing-groups-with-nesting.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 13,
+    "lineNumber": 1,
+    "column": 14,
+    "message": "Invalid regular expression: /(?<x>a)(?:(?<x>b)|(?<x>c))/: Duplicate capture group name"
+};

tests/fixtures/ecma-version/16/duplicate-named-capturing-groups/invalid-duplicate-named-capturing-groups-with-nesting.src.js

@@ -0,0 +1 @@
+const re1 = /(?<x>a)(?:(?<x>b)|(?<x>c))/;

tests/fixtures/ecma-version/16/duplicate-named-capturing-groups/invalid-duplicate-named-capturing-groups.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 13,
+    "lineNumber": 1,
+    "column": 14,
+    "message": "Invalid regular expression: /(?<x>a)(?<x>b)/: Duplicate capture group name"
+};

tests/fixtures/ecma-version/16/duplicate-named-capturing-groups/invalid-duplicate-named-capturing-groups.src.js

@@ -0,0 +1 @@
+const re1 = /(?<x>a)(?<x>b)/;