Merge branch 'main' into duplicate-test-cases

* main:
  docs: Update note about ECMAScript support (eslint#17991)
  chore: update `markdownlint` to `v0.33.0` (eslint#17995)
  docs: Update release blog post template (eslint#17994)
  docs: Add sections on non-npm plugin configuration (eslint#17984)
  9.0.0-alpha.1
  Build: changelog update for 9.0.0-alpha.1
  chore: package.json update for @eslint/js release

CHANGELOG.md

@@ -1,3 +1,36 @@
+v9.0.0-alpha.1 - January 12, 2024
+
+* [`c5e50ee`](https://github.com/eslint/eslint/commit/c5e50ee65cf22871770b1d4d438b9056c577f646) chore: package.json update for @eslint/js release (Jenkins)
+* [`1bf2520`](https://github.com/eslint/eslint/commit/1bf2520c4166aa55596417bf44c567555bc65fba) chore: Split Docs CI from core CI (#17897) (Nicholas C. Zakas)
+* [`6d11f3d`](https://github.com/eslint/eslint/commit/6d11f3dac1b76188d7fda6e772e89b5c3945ac4d) fix: Ensure config keys are printed for config errors (#17980) (Nicholas C. Zakas)
+* [`320787e`](https://github.com/eslint/eslint/commit/320787e661beb979cf063d0f8333654f94ef9efd) chore: delete relative-module-resolver.js (#17981) (Francesco Trotta)
+* [`96307da`](https://github.com/eslint/eslint/commit/96307da837c407c9a1275124b65ca29c07ffd5e4) docs: migration guide entry for `no-inner-declarations` (#17977) (Tanuj Kanti)
+* [`40be60e`](https://github.com/eslint/eslint/commit/40be60e0186cdde76219df4e8e628125df2912d8) docs: Update README (GitHub Actions Bot)
+* [`a630edd`](https://github.com/eslint/eslint/commit/a630edd809894dc38752705bb5954d847987f031) feat: maintain latest ecma version in ESLint (#17958) (Milos Djermanovic)
+* [`701f1af`](https://github.com/eslint/eslint/commit/701f1afbee34e458b56d2dfa36d9153d6aebea3a) feat!: no-inner-declaration new default behaviour and option (#17885) (Tanuj Kanti)
+* [`b4e0503`](https://github.com/eslint/eslint/commit/b4e0503a56beea1222be266cc6b186d89410d1f2) feat: add `no-useless-assignment` rule (#17625) (Yosuke Ota)
+* [`806f708`](https://github.com/eslint/eslint/commit/806f70878e787f2c56aaa42a3e7adb61bc015278) fix: `no-misleading-character-class` edge cases with granular errors (#17970) (Milos Djermanovic)
+* [`287c4b7`](https://github.com/eslint/eslint/commit/287c4b7d498746b43392ee4fecd6904a9cd4b30b) feat: `no-misleading-character-class` granular errors (#17515) (Josh Goldberg ✨)
+* [`d31c180`](https://github.com/eslint/eslint/commit/d31c180312260d1a286cc8162907b6a33368edc9) docs: fix number of code-path events on custom rules page (#17969) (Richard Hunter)
+* [`1529ab2`](https://github.com/eslint/eslint/commit/1529ab288ec815b2690864e04dd6d0a1f0b537c6) docs: reorder entries in v9 migration guide (#17967) (Milos Djermanovic)
+* [`bde5105`](https://github.com/eslint/eslint/commit/bde51055530d4a71bd9f48c90ed7de9c0b767d86) fix!: handle `--output-file` for empty output when saving to disk (#17957) (Nitin Kumar)
+* [`9507525`](https://github.com/eslint/eslint/commit/95075251fb3ce35aaf7eadbd1d0a737106c13ec6) docs: Explain how to combine configs (#17947) (Nicholas C. Zakas)
+* [`7c78576`](https://github.com/eslint/eslint/commit/7c785769fd177176966de7f6c1153480f7405000) docs: Add more removed `context` methods to migrate to v9 guide (#17951) (Milos Djermanovic)
+* [`07107a5`](https://github.com/eslint/eslint/commit/07107a5904c2580243971c8ad7f26a04738b712e) fix!: upgrade [email protected] (#17942) (Milos Djermanovic)
+* [`3ee0f6c`](https://github.com/eslint/eslint/commit/3ee0f6ca5d756da647e4e76bf3daa82a5905a792) fix!: no-unused-vars `varsIgnorePattern` behavior with catch arguments (#17932) (Tanuj Kanti)
+* [`4926f33`](https://github.com/eslint/eslint/commit/4926f33b96faf07a64aceec5f1f4882f4faaf4b5) refactor: use `Object.hasOwn()` (#17948) (Milos Djermanovic)
+* [`df200e1`](https://github.com/eslint/eslint/commit/df200e147705eb62f94b99c170554327259c65d4) refactor: use `Array.prototype.at()` to get last elements (#17949) (Milos Djermanovic)
+* [`51f8bc8`](https://github.com/eslint/eslint/commit/51f8bc836bf0b13dad3a897ae84259bcdaed2431) fix!: configuration comments with just severity should retain options (#17945) (Milos Djermanovic)
+* [`3a877d6`](https://github.com/eslint/eslint/commit/3a877d68d0151679f8bf1cabc39746778754b3dd) docs: Update removed CLI flags migration (#17939) (Nicholas C. Zakas)
+* [`750b8df`](https://github.com/eslint/eslint/commit/750b8dff6df02a500e12cb78390fd14814c82e5b) chore: update dependency glob to v10 (#17917) (renovate[bot])
+* [`c2bf27d`](https://github.com/eslint/eslint/commit/c2bf27def29ef1ca7f5bfe20c1306bf78087ea29) build: update docs files when publishing prereleases (#17940) (Milos Djermanovic)
+* [`d191bdd`](https://github.com/eslint/eslint/commit/d191bdd67214c33e65bd605e616ca7cc947fd045) feat!: Remove CodePath#currentSegments (#17936) (Milos Djermanovic)
+* [`4a9cd1e`](https://github.com/eslint/eslint/commit/4a9cd1ea1cd0c115b98d07d1b6018ca918a9c73f) docs: Update Linter API for v9 (#17937) (Milos Djermanovic)
+* [`74794f5`](https://github.com/eslint/eslint/commit/74794f53a6bc88b67653c737f858cfdf35b1c73d) chore: removed unused eslintrc modules (#17938) (Milos Djermanovic)
+* [`10ed29c`](https://github.com/eslint/eslint/commit/10ed29c0c4505dbac3bb05b0e3d61f329b99f747) chore: remove unused dependency rimraf (#17934) (Francesco Trotta)
+* [`2a8eea8`](https://github.com/eslint/eslint/commit/2a8eea8e5847f4103d90d667a2b08edf9795545f) docs: update docs for v9.0.0-alpha.0 (#17929) (Milos Djermanovic)
+* [`903ee60`](https://github.com/eslint/eslint/commit/903ee60ea910aee344df7edb66874f80e4b6ed31) ci: use `--force` flag when installing eslint (#17921) (Milos Djermanovic)
+
 v9.0.0-alpha.0 - December 29, 2023
 
 * [`7f0ba51`](https://github.com/eslint/eslint/commit/7f0ba51bcef3e6fbf972ceb20403238f0e1f0ea9) docs: show `NEXT` in version selectors (#17911) (Milos Djermanovic)

README.md

@@ -117,7 +117,7 @@ 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, 2019, 2020, 2021, 2022, and 2023. You can set your desired ECMAScript syntax (and other settings, like global variables or your target environments) through [configuration](https://eslint.org/docs/latest/use/configure).
+ESLint has full support for ECMAScript 3, 5, and every year from 2015 up until the most recent stage 4 specification (the default). You can set your desired ECMAScript syntax and other settings (like global variables) through [configuration](https://eslint.org/docs/latest/use/configure).
 
 ### What about experimental features?
 

docs/package.json

@@ -1,7 +1,7 @@
 {
     "name": "docs-eslint",
     "private": true,
-    "version": "9.0.0-alpha.0",
+    "version": "9.0.0-alpha.1",
     "description": "",
     "main": "index.js",
     "keywords": [],

docs/src/_data/rule_versions.json

@@ -308,7 +308,8 @@
         "logical-assignment-operators": "8.24.0",
         "no-empty-static-block": "8.27.0",
         "no-new-native-nonconstructor": "8.27.0",
-        "no-object-constructor": "8.50.0"
+        "no-object-constructor": "8.50.0",
+        "no-useless-assignment": "9.0.0-alpha.1"
     },
     "removed": {
         "generator-star": "1.0.0-rc-1",
@@ -328,6 +329,8 @@
         "space-in-brackets": "1.0.0-rc-1",
         "space-return-throw-case": "2.0.0-beta.3",
         "space-unary-word-ops": "0.10.0",
-        "spaced-line-comment": "1.0.0-rc-1"
+        "spaced-line-comment": "1.0.0-rc-1",
+        "require-jsdoc": "9.0.0-alpha.0",
+        "valid-jsdoc": "9.0.0-alpha.0"
     }
-}
+}

docs/src/_data/rules.json

@@ -372,6 +372,13 @@
                 "fixable": false,
                 "hasSuggestions": false
             },
+            {
+                "name": "no-useless-assignment",
+                "description": "Disallow variable assignments when the value is not used",
+                "recommended": false,
+                "fixable": false,
+                "hasSuggestions": false
+            },
             {
                 "name": "no-useless-backreference",
                 "description": "Disallow useless backreferences in regular expressions",

docs/src/_data/rules_meta.json

@@ -1962,6 +1962,14 @@
             "url": "https://eslint.org/docs/latest/rules/no-use-before-define"
         }
     },
+    "no-useless-assignment": {
+        "type": "problem",
+        "docs": {
+            "description": "Disallow variable assignments when the value is not used",
+            "recommended": false,
+            "url": "https://eslint.org/docs/latest/rules/no-useless-assignment"
+        }
+    },
     "no-useless-backreference": {
         "type": "problem",
         "docs": {

docs/src/extend/scope-manager-interface.md

@@ -358,13 +358,13 @@ Those members are defined but not used in ESLint.
 
 | type                       | node |
 |:---------------------------|:-----|
-| `"CatchClause"`            | `CatchClause`
-| `"ClassName"`              | `ClassDeclaration` or `ClassExpression`
-| `"FunctionName"`           | `FunctionDeclaration` or `FunctionExpression`
-| `"ImplicitGlobalVariable"` | `Program`
-| `"ImportBinding"`          | `ImportSpecifier`, `ImportDefaultSpecifier`, or `ImportNamespaceSpecifier`
-| `"Parameter"`              | `FunctionDeclaration`, `FunctionExpression`, or `ArrowFunctionExpression`
-| `"Variable"`               | `VariableDeclarator`
+| `"CatchClause"`            | `CatchClause` |
+| `"ClassName"`              | `ClassDeclaration` or `ClassExpression` |
+| `"FunctionName"`           | `FunctionDeclaration` or `FunctionExpression` |
+| `"ImplicitGlobalVariable"` | `Program` |
+| `"ImportBinding"`          | `ImportSpecifier`, `ImportDefaultSpecifier`, or `ImportNamespaceSpecifier` |
+| `"Parameter"`              | `FunctionDeclaration`, `FunctionExpression`, or `ArrowFunctionExpression` |
+| `"Variable"`               | `VariableDeclarator` |
 
 #### parent
 
@@ -373,13 +373,13 @@ Those members are defined but not used in ESLint.
 
 | type                       | parent |
 |:---------------------------|:-------|
-| `"CatchClause"`            | `null`
-| `"ClassName"`              | `null`
-| `"FunctionName"`           | `null`
-| `"ImplicitGlobalVariable"` | `null`
-| `"ImportBinding"`          | `ImportDeclaration`
-| `"Parameter"`              | `null`
-| `"Variable"`               | `VariableDeclaration`
+| `"CatchClause"`            | `null` |
+| `"ClassName"`              | `null` |
+| `"FunctionName"`           | `null` |
+| `"ImplicitGlobalVariable"` | `null` |
+| `"ImportBinding"`          | `ImportDeclaration` |
+| `"Parameter"`              | `null` |
+| `"Variable"`               | `VariableDeclaration` |
 
 ### Deprecated members
 

docs/src/use/configure/plugins.md

@@ -44,6 +44,54 @@ export default [
 When creating a namespace for a plugin, the convention is to use the npm package name without the `eslint-plugin-` prefix. In the preceding example, `eslint-plugin-example` is assigned a namespace of `example`.
 :::
 
+### Configure a Local Plugin
+
+Plugins don't need to be published to npm for use with ESLint. You can also load plugins directly from a file, as in this example:
+
+```js
+// eslint.config.js
+import local from "./my-local-plugin.js";
+
+export default [
+    {
+        plugins: {
+            local
+        },
+        rules: {
+            "local/rule1": "warn"
+        }
+    }
+];
+```
+
+Here, the namespace `local` is used, but you can also use any name you'd like instead.
+
+### Configure a Virtual Plugin
+
+Plugin definitions can be created virtually directly in your config. For example, suppose you have a rule contained in a file called `my-rule.js` that you'd like to enable in your config. You can define a virtual plugin to do so, as in this example:
+
+```js
+// eslint.config.js
+import myRule from "./rules/my-rule.js";
+
+export default [
+    {
+        plugins: {
+            local: {
+                rules: {
+                    "my-rule": myRule
+                }
+            }
+        },
+        rules: {
+            "local/my-rule": "warn"
+        }
+    }
+];
+```
+
+Here, the namespace `local` is used to define a virtual plugin. The rule `myRule` is then assigned a name of `my-rule` inside of the virtual plugin's `rules` object. (See [Create Plugins](../../extend/plugins) for the complete format of a plugin.) You can then reference the rule as `local/my-rule` to configure it.
+
 ## Use Plugin Rules
 
 You can use specific rules included in a plugin. To do this, specify the plugin

docs/src/use/formatters/html-formatter-example.html

@@ -118,15 +118,15 @@
         <div id="overview" class="bg-2">
             <h1>ESLint Report</h1>
             <div>
-                <span>9 problems (5 errors, 4 warnings)</span> - Generated on Sat Dec 30 2023 01:21:43 GMT+0100 (Central European Standard Time)
+                <span>8 problems (4 errors, 4 warnings)</span> - Generated on Fri Jan 12 2024 20:48:30 GMT+0000 (Coordinated Universal Time)
             </div>
         </div>
         <table>
             <tbody>
                 <tr class="bg-2" data-group="f-0">
     <th colspan="4">
-        [+] C:\projects\eslint\fullOfProblems.js
-        <span>9 problems (5 errors, 4 warnings)</span>
+        [+] /var/lib/jenkins/workspace/eslint Release/eslint/fullOfProblems.js
+        <span>8 problems (4 errors, 4 warnings)</span>
     </th>
 </tr>
 <tr style="display: none;" class="f-0">
@@ -201,15 +201,6 @@ <h1>ESLint Report</h1>
     </td>
 </tr>
 
-<tr style="display: none;" class="f-0">
-    <td>7:2</td>
-    <td class="clr-2">Error</td>
-    <td>Unnecessary semicolon.</td>
-    <td>
-        <a href="" target="_blank" rel="noopener noreferrer">no-extra-semi</a>
-    </td>
-</tr>
-
             </tbody>
         </table>
         <script type="text/javascript">

docs/src/use/formatters/index.md

@@ -78,7 +78,7 @@ Example output (formatted for easier reading):
 {
     "results": [
         {
-            "filePath": "C:\\projects\\eslint\\fullOfProblems.js",
+            "filePath": "/var/lib/jenkins/workspace/eslint Release/eslint/fullOfProblems.js",
             "messages": [
                 {
                     "ruleId": "no-unused-vars",
@@ -202,31 +202,13 @@ Example output (formatted for easier reading):
                         ],
                         "text": ";"
                     }
-                },
-                {
-                    "ruleId": "no-extra-semi",
-                    "severity": 2,
-                    "message": "Unnecessary semicolon.",
-                    "line": 7,
-                    "column": 2,
-                    "nodeType": "EmptyStatement",
-                    "messageId": "unexpected",
-                    "endLine": 7,
-                    "endColumn": 3,
-                    "fix": {
-                        "range": [
-                            93,
-                            95
-                        ],
-                        "text": "}"
-                    }
                 }
             ],
             "suppressedMessages": [],
-            "errorCount": 5,
+            "errorCount": 4,
             "fatalErrorCount": 0,
             "warningCount": 4,
-            "fixableErrorCount": 2,
+            "fixableErrorCount": 1,
             "fixableWarningCount": 4,
             "source": "function addOne(i) {\n    if (i != NaN) {\n        return i ++\n    } else {\n      return\n    }\n};"
         }
@@ -680,7 +662,7 @@ Example output (formatted for easier reading):
 ```json
 [
     {
-        "filePath": "C:\\projects\\eslint\\fullOfProblems.js",
+        "filePath": "/var/lib/jenkins/workspace/eslint Release/eslint/fullOfProblems.js",
         "messages": [
             {
                 "ruleId": "no-unused-vars",
@@ -804,31 +786,13 @@ Example output (formatted for easier reading):
                     ],
                     "text": ";"
                 }
-            },
-            {
-                "ruleId": "no-extra-semi",
-                "severity": 2,
-                "message": "Unnecessary semicolon.",
-                "line": 7,
-                "column": 2,
-                "nodeType": "EmptyStatement",
-                "messageId": "unexpected",
-                "endLine": 7,
-                "endColumn": 3,
-                "fix": {
-                    "range": [
-                        93,
-                        95
-                    ],
-                    "text": "}"
-                }
             }
         ],
         "suppressedMessages": [],
-        "errorCount": 5,
+        "errorCount": 4,
         "fatalErrorCount": 0,
         "warningCount": 4,
-        "fixableErrorCount": 2,
+        "fixableErrorCount": 1,
         "fixableWarningCount": 4,
         "source": "function addOne(i) {\n    if (i != NaN) {\n        return i ++\n    } else {\n      return\n    }\n};"
     }
@@ -843,7 +807,7 @@ Example output:
 
 ```text
 
-C:\projects\eslint\fullOfProblems.js
+/var/lib/jenkins/workspace/eslint Release/eslint/fullOfProblems.js
   1:10  error    'addOne' is defined but never used            no-unused-vars
   2:9   error    Use the isNaN function to compare with NaN    use-isnan
   3:16  error    Unexpected space before unary operator '++'   space-unary-ops
@@ -852,9 +816,8 @@ C:\projects\eslint\fullOfProblems.js
   5:1   warning  Expected indentation of 8 spaces but found 6  indent
   5:7   error    Function 'addOne' expected a return value     consistent-return
   5:13  warning  Missing semicolon                             semi
-  7:2   error    Unnecessary semicolon                         no-extra-semi
 
-✖ 9 problems (5 errors, 4 warnings)
-  2 errors and 4 warnings potentially fixable with the `--fix` option.
+✖ 8 problems (4 errors, 4 warnings)
+  1 error and 4 warnings potentially fixable with the `--fix` option.
 
 ```

package.json

@@ -1,6 +1,6 @@
 {
   "name": "eslint",
-  "version": "9.0.0-alpha.0",
+  "version": "9.0.0-alpha.1",
   "author": "Nicholas C. Zakas <[email protected]>",
   "description": "An AST-based pattern checker for JavaScript.",
   "bin": {
@@ -135,7 +135,7 @@
     "load-perf": "^0.2.0",
     "markdown-it": "^12.2.0",
     "markdown-it-container": "^3.0.0",
-    "markdownlint": "^0.32.0",
+    "markdownlint": "^0.33.0",
     "markdownlint-cli": "^0.38.0",
     "marked": "^4.0.8",
     "memfs": "^3.0.1",

packages/js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@eslint/js",
-  "version": "9.0.0-alpha.0",
+  "version": "9.0.0-alpha.1",
   "description": "ESLint JavaScript language implementation",
   "main": "./src/index.js",
   "scripts": {},

templates/blogpost.md.ejs

@@ -50,7 +50,7 @@ npm i eslint@<%- version %> --save-dev
 
 ### Migration Guide
 
-As there are a lot of changes, we've created a [migration guide](/docs/<%- prereleaseMajorVersion %>/use/migrating-to-<%- prereleaseMajorVersion %>) describing the changes in great detail along with the steps you should take to address them. We expect that most users should be able to upgrade without any build changes, but the migration guide should be a useful resource if you encounter problems.
+As there are a lot of changes, we've created a [migration guide](/docs/next/use/migrate-to-<%- prereleaseMajorVersion %>) describing the breaking changes in great detail along with the steps you should take to address them. We expect that most users should be able to upgrade without any build changes, but the migration guide should be a useful resource if you encounter problems.
 
 <% } %>