Upgrade ESLint and fix linting issues

.eslintrc.json

@@ -1,54 +0,0 @@
-{
-    "env": {
-        "es2021": true,
-        "node": true
-    },
-    "extends": ["eslint:recommended", "plugin:@stylistic/all-extends"],
-    "ignorePatterns": ["node_modules", "*example.js"],
-    "parserOptions": {
-        "ecmaVersion": 2021,
-        "sourceType": "module"
-    },
-    "rules": {
-        "curly": "error",
-        "no-implicit-coercion": "error",
-        "no-unused-vars": [
-            "error",
-            {
-                "vars": "all",
-                "args": "none",
-                "ignoreRestSiblings": false
-            }
-        ],
-        "@stylistic/array-bracket-newline": ["error", "consistent"],
-        "@stylistic/array-element-newline": ["error", "consistent"],
-        "@stylistic/arrow-parens": "off",
-        "@stylistic/comma-dangle": ["error", "always-multiline"],
-        "@stylistic/dot-location": ["error", "property"],
-        "@stylistic/function-call-argument-newline": ["error", "consistent"],
-        "@stylistic/function-paren-newline": "off",
-        "@stylistic/indent": ["error", "tab"],
-        "@stylistic/indent-binary-ops": ["error", "tab"],
-        "@stylistic/max-len": "off",
-        "@stylistic/multiline-ternary": ["error", "always-multiline"],
-        "@stylistic/newline-per-chained-call": ["error", { "ignoreChainWithDepth": 1 }],
-        "@stylistic/no-mixed-operators": "off",
-        "@stylistic/no-tabs": "off",
-        "@stylistic/object-property-newline": "off",
-        "@stylistic/one-var-declaration-per-line": "off",
-        "@stylistic/operator-linebreak": ["error", "before"],
-        "@stylistic/padded-blocks": "off",
-        "@stylistic/quote-props": ["error", "consistent-as-needed"],
-        "@stylistic/quotes": ["error", "single"]
-    },
-    "overrides": [
-        {
-            "files": [
-                "test/**"
-            ],
-            "rules": {
-                "no-unused-vars": "off"
-            }
-        }
-    ]
-}

eslint.config.js

@@ -0,0 +1,61 @@
+import eslintPluginJs from '@eslint/js';
+import eslintPluginStylistic from '@stylistic/eslint-plugin';
+import globals from 'globals';
+
+
+const config = [
+	eslintPluginJs.configs.recommended,
+	eslintPluginStylistic.configs['all-flat'],
+	{
+		files: ['**/*.js'],
+		languageOptions: {
+			ecmaVersion: 'latest',
+			globals: {
+				...globals.node,
+			},
+			sourceType: 'module',
+		},
+		rules: {
+			'@stylistic/array-bracket-newline': ['error', 'consistent'],
+			'@stylistic/array-element-newline': ['error', 'consistent'],
+			'@stylistic/arrow-parens': 'off',
+			'@stylistic/comma-dangle': ['error', 'always-multiline'],
+			'@stylistic/dot-location': ['error', 'property'],
+			'@stylistic/function-call-argument-newline': ['error', 'consistent'],
+			'@stylistic/function-paren-newline': 'off',
+			'@stylistic/indent': ['error', 'tab'],
+			'@stylistic/indent-binary-ops': ['error', 'tab'],
+			'@stylistic/max-len': 'off',
+			'@stylistic/multiline-comment-style': 'off',
+			'@stylistic/multiline-ternary': ['error', 'always-multiline'],
+			'@stylistic/newline-per-chained-call': ['error', {ignoreChainWithDepth: 1}],
+			'@stylistic/no-mixed-operators': 'off',
+			'@stylistic/no-tabs': 'off',
+			'@stylistic/object-property-newline': 'off',
+			'@stylistic/one-var-declaration-per-line': 'off',
+			'@stylistic/operator-linebreak': ['error', 'before'],
+			'@stylistic/padded-blocks': 'off',
+			'@stylistic/quote-props': ['error', 'consistent-as-needed'],
+			'@stylistic/quotes': ['error', 'single'],
+			'curly': 'error',
+			'no-implicit-coercion': 'error',
+			'no-unused-vars': [
+				'error',
+				{
+					vars: 'all',
+					args: 'none',
+					ignoreRestSiblings: false,
+				},
+			],
+		},
+	},
+	{
+		files: ['test/**', '**/example.js'],
+		rules: {
+			'no-unused-vars': 'off',
+			'@stylistic/semi': 'off',
+		},
+	},
+];
+
+export default config;

package.json

@@ -72,9 +72,9 @@
 		"@pollyjs/adapter-node-http": "^6.0.5",
 		"@pollyjs/core": "^6.0.5",
 		"@pollyjs/persister-fs": "^6.0.5",
-		"@stylistic/eslint-plugin": "^1.5.1",
+		"@stylistic/eslint-plugin": "^3.1.0",
 		"db-rest": "github:derhuerst/db-rest",
-		"eslint": "^8.56.0",
+		"eslint": "^9.20.1",
 		"hafas-rest-api": "^5.1.3",
 		"is-coordinates": "^2.0.2",
 		"is-roughly-equal": "^0.1.0",
@@ -84,8 +84,8 @@
 		"validate-fptf": "^3.0.0"
 	},
 	"scripts": {
-		"lint": "eslint .",
+		"lint": "eslint",
-		"lint:fix": "eslint . --fix",
+		"lint:fix": "eslint --fix",
 		"test-unit": "tap test/lib/*.js test/*.js test/format/*.js test/parse/*.js",
 		"test-integration": "VCR_MODE=playback tap test/e2e/*.js",
 		"test-integration:record": "VCR_MODE=record tap -t60 -j1 test/e2e/*.js",