feat: add eslint 9 support (#3)

BREAKING CHANGE: needs @eslint/js and @estlint/eslintrc dependencies to work

Author: BryanBerger98

.editorconfig

@@ -0,0 +1,15 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

.eslintrc

@@ -0,0 +1,18 @@
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import { FlatCompat } from '@eslint/eslintrc';
+import js from '@eslint/js';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const compat = new FlatCompat({
+	baseDirectory: __dirname,
+	recommendedConfig: js.configs.recommended,
+	allConfig: js.configs.all,
+});
+
+export default [
+	...compat.extends('./javascript.js', './imports.js', './react.js', './typescript.js'),
+	{ rules: { 'max-len': 0 } },
+];

eslint.config.mjs

@@ -1,4 +1,3 @@
-/* eslint-disable no-magic-numbers */
 module.exports = {
 	rules: {
 		// enforces getter/setter pairs in objects

javascript/best-practices.js

@@ -1,4 +1,3 @@
-/* eslint-disable no-magic-numbers */
 module.exports = {
 	rules: {
 		// enforce line breaks after opening and before closing array brackets
@@ -135,7 +134,7 @@ module.exports = {
 		// https://eslint.org/docs/rules/indent
 		indent: [
 			'warn',
-			'tab',
+			2,
 			{ SwitchCase: 1 },
 		],
 
@@ -374,12 +373,7 @@ module.exports = {
 
 		// disallow dangling underscores in identifiers
 		// https://eslint.org/docs/rules/no-underscore-dangle
-		'no-underscore-dangle': [ 'warn', {
-			allow: [ '_id' ],
-			allowAfterThis: false,
-			allowAfterSuper: false,
-			enforceInMethodNames: true,
-		} ],
+		'no-underscore-dangle': 'off',
 
 		// disallow the use of Boolean literals in conditional expressions
 		// also, prefer `a || b` over `a ? a : b`

javascript/style.js

@@ -61,17 +61,6 @@ module.exports = {
 		// disallow use of variables before they are defined
 		'no-use-before-define': 'warn',
 
-		'no-magic-numbers': [ 'warn', {
-			ignoreDefaultValues: true,
-			ignoreArrayIndexes: true,
-			ignoreClassFieldInitialValues: true,
-			enforceConst: true,
-			detectObjects: false,
-			ignore: [
-				0,
-				1,
-				-1,
-			],
-		} ],
+		'no-magic-numbers': 'off'
 	},
 };