.github/security.md

@@ -0,0 +1,3 @@
+# Security Policy
+
+To report a security vulnerability, please use the [Tidelift security contact](https://tidelift.com/security). Tidelift will coordinate the fix and disclosure.

.github/workflows/main.yml

@@ -0,0 +1,21 @@
+name: CI
+on:
+  - push
+  - pull_request
+jobs:
+  test:
+    name: Node.js ${{ matrix.node-version }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version:
+          - 20
+          - 18
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm test

conf/eslint.js

@@ -0,0 +1,8 @@
+module.exports = [
+	{
+		rules: {
+			'no-alert': 1,
+			'camelcase': 2
+		}
+	}
+];

conf/rules/no-alert.js

@@ -1,10 +1,12 @@
 'use strict';
-module.exports = function (context) {
-	return {
-		CallExpression(node) {
-			if (node.callee.name === 'alert') {
-				context.report(node, 'testing custom rules.');
+module.exports = {
+	create(context) {
+		return {
+			CallExpression(node) {
+				if (node.callee.name === 'alert') {
+					context.report(node, 'testing custom rules.');
+				}
 			}
-		}
-	};
+		};
+	}
 };

gruntfile.js

@@ -1,10 +1,15 @@
 'use strict';
+
+const noAlertRule = require('./conf/rules/no-alert');
+
 module.exports = grunt => {
 	grunt.initConfig({
 		eslint: {
 			options: {
-				configFile: 'conf/eslint.json',
-				rulePaths: ['conf/rules'],
+				overrideConfigFile: 'conf/eslint.js',
+				plugins: {
+					noAlertRule
+				},
 				quiet: true
 			},
 			validate: ['test/fixture/{1,2}.js']
@@ -13,15 +18,15 @@ module.exports = grunt => {
 			eslint: {
 				command: 'grunt eslint',
 				options: {
-					callback: (err, stdout, stderr, cb) => {
+					callback: (error, stdout, stderr, callback) => {
 						if (/test\/fixture\/2\.js/.test(stdout)) {
 							if (/camelcase/.test(stdout) && !/\swarning\s/.test(stdout)) {
-								cb();
+								callback();
 							} else {
-								cb(false);
+								callback(false);
 							}
 						} else {
-							cb(false);
+							callback(false);
 						}
 					}
 				}

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "grunt-eslint",
-	"version": "23.0.0",
+	"version": "25.0.0",
 	"description": "Validate files with ESLint",
 	"license": "MIT",
 	"repository": "sindresorhus/grunt-eslint",
@@ -10,8 +10,9 @@
 		"email": "sindresorhus@gmail.com",
 		"url": "https://sindresorhus.com"
 	},
+	"sideEffects": false,
 	"engines": {
-		"node": ">=10"
+		"node": "^18.18.0 || ^20.9.0 || >=21.1.0"
 	},
 	"scripts": {
 		"test": "grunt"
@@ -27,13 +28,13 @@
 		"report"
 	],
 	"dependencies": {
-		"chalk": "^4.0.0",
-		"eslint": "^7.0.0"
+		"chalk": "^4.1.2",
+		"eslint": "^9.0.0"
 	},
 	"devDependencies": {
-		"grunt": "^1.0.1",
-		"grunt-cli": "^1.2.0",
-		"grunt-shell": "^3.0.1"
+		"grunt": "^1.6.1",
+		"grunt-cli": "^1.4.3",
+		"grunt-shell": "^4.0.0"
 	},
 	"peerDependencies": {
 		"grunt": ">=1"

readme.md

@@ -1,13 +1,13 @@
-# grunt-eslint [![Build Status](https://travis-ci.com/sindresorhus/grunt-eslint.svg?branch=master)](https://travis-ci.com/github/sindresorhus/grunt-eslint)
+# grunt-eslint
 
 > Validate files with [ESLint](https://eslint.org)
 
 ![](screenshot.png)
 
 ## Install
 
-```
-$ npm install --save-dev grunt-eslint
+```sh
+npm install --save-dev grunt-eslint
 ```
 
 ## Usage
@@ -29,11 +29,15 @@ grunt.registerTask('default', ['eslint']);
 ### Custom config and rules
 
 ```js
+const noAlertRule = require('./conf/rules/no-alert');
+
 grunt.initConfig({
 	eslint: {
 		options: {
-			configFile: 'conf/eslint.json',
-			rulePaths: ['conf/rules']
+			overrideConfigFile: 'conf/eslint.js',
+			plugins: {
+				noAlertRule
+			}
 		},
 		target: ['file.js']
 	}
@@ -46,7 +50,7 @@ grunt.initConfig({
 grunt.initConfig({
 	eslint: {
 		options: {
-			format: require('eslint-tap')
+			format: './node_modules/eslint-tap/index.js'
 		},
 		target: ['file.js']
 	}
@@ -55,7 +59,7 @@ grunt.initConfig({
 
 ## Options
 
-See the [ESLint options](https://eslint.org/docs/developer-guide/nodejs-api#cliengine).
+See the [ESLint options](https://eslint.org/docs/developer-guide/nodejs-api#-new-eslintoptions).
 
 In addition the following options are supported:
 
@@ -64,7 +68,7 @@ In addition the following options are supported:
 Type: `string`\
 Default: `'stylish'`
 
-Name of a [built-in formatter](https://github.com/eslint/eslint/tree/master/lib/cli-engine/formatters) or path to a custom one.
+The name of a [built-in formatter](https://github.com/eslint/eslint/tree/master/lib/cli-engine/formatters) or path to a custom one.
 
 Some formatters you might find useful: [eslint-json](https://github.com/sindresorhus/eslint-json), [eslint-tap](https://github.com/sindresorhus/eslint-tap).
 
@@ -87,7 +91,7 @@ Report errors only.
 Type: `number`\
 Default: `-1` *(Means no limit)*
 
-Number of warnings to trigger non-zero exit code.
+The nmber of warnings to trigger non-zero exit code.
 
 ### failOnError
 

tasks/eslint.js

@@ -1,62 +1,78 @@
 'use strict';
 const chalk = require('chalk');
-const eslint = require('eslint');
+const {ESLint} = require('eslint');
 
 module.exports = grunt => {
 	grunt.registerMultiTask('eslint', 'Validate files with ESLint', function () {
-		const options = this.options({
-			outputFile: false,
-			quiet: false,
-			maxWarnings: -1,
-			failOnError: true,
-		});
+		const done = this.async();
 
-		if (this.filesSrc.length === 0) {
-			grunt.log.writeln(chalk.magenta('Could not find any files to validate'));
-			return true;
-		}
+		(async () => {
+			try {
+				const {
+					format,
+					quiet,
+					maxWarnings,
+					failOnError,
+					outputFile,
+					...options
+				} = this.options({
+					outputFile: false,
+					quiet: false,
+					maxWarnings: -1,
+					failOnError: true,
+					format: 'stylish'
+				});
 
-		const formatter = eslint.CLIEngine.getFormatter(options.format);
+				if (this.filesSrc.length === 0) {
+					grunt.log.writeln(chalk.magenta('Could not find any files to validate'));
+					done(true);
+					return;
+				}
 
-		if (!formatter) {
-			grunt.warn(`Could not find formatter ${options.format}`);
-			return false;
-		}
+				const engine = new ESLint(options);
 
-		const engine = new eslint.CLIEngine(options);
+				const formatter = await engine.loadFormatter(format);
 
-		let report;
-		try {
-			report = engine.executeOnFiles(this.filesSrc);
-		} catch (error) {
-			grunt.warn(error);
-			return false;
-		}
+				if (!formatter) {
+					grunt.warn(`Could not find formatter ${format}`);
+					done(false);
+					return;
+				}
 
-		if (options.fix) {
-			eslint.CLIEngine.outputFixes(report);
-		}
+				let results = await engine.lintFiles(this.filesSrc);
 
-		let results = report.results;
+				if (options.fix) {
+					await ESLint.outputFixes(results);
+				}
 
-		if (options.quiet) {
-			results = eslint.CLIEngine.getErrorResults(results);
-		}
+				if (quiet) {
+					results = ESLint.getErrorResults(results);
+				}
 
-		const output = formatter(results);
+				const output = await formatter.format(results);
 
-		if (options.outputFile) {
-			grunt.file.write(options.outputFile, output);
-		} else if (output) {
-			console.log(output);
-		}
+				if (outputFile) {
+					grunt.file.write(outputFile, output);
+				} else if (output) {
+					console.log(output);
+				}
 
-		const tooManyWarnings = options.maxWarnings >= 0 && report.warningCount > options.maxWarnings;
+				const {warningCount, errorCount} = results.reduce((count, {warningCount, errorCount}) => {
+					count.warningCount += warningCount;
+					count.errorCount += errorCount;
+					return count;
+				}, {warningCount: 0, errorCount: 0});
 
-		if (report.errorCount === 0 && tooManyWarnings) {
-			grunt.warn(`ESLint found too many warnings (maximum: ${options.maxWarnings})`);
-		}
+				const tooManyWarnings = maxWarnings >= 0 && warningCount > maxWarnings;
 
-		return options.failOnError ? report.errorCount === 0 : 0;
+				if (errorCount === 0 && tooManyWarnings) {
+					grunt.warn(`ESLint found too many warnings (maximum: ${maxWarnings})`);
+				}
+
+				done(failOnError ? errorCount === 0 : 0);
+			} catch (error) {
+				done(error);
+			}
+		})();
 	});
 };