migrate eslint

Author: felixroos

.eslintrc.json

@@ -14,5 +14,6 @@
   "rules": {
     "no-unused-vars": ["warn", { "destructuredArrayIgnorePattern": ".", "ignoreRestSiblings": false }],
     "import/no-extraneous-dependencies": ["error", {"devDependencies": true}]
-  }
+  },
+  "files": ["**/*.mjs", "**/*.js"]
 }

eslint.config.mjs

@@ -0,0 +1,86 @@
+import _import from 'eslint-plugin-import';
+import { fixupPluginRules } from '@eslint/compat';
+import globals from 'globals';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import js from '@eslint/js';
+import { FlatCompat } from '@eslint/eslintrc';
+
+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 [
+  {
+    ignores: [
+      '**/krill-parser.js',
+      '**/krill.pegjs',
+      '**/.eslintrc.json',
+      '**/server.js',
+      '**/tidal-sniffer.js',
+      '**/*.jsx',
+      '**/tunejs.js',
+      'out/**/*',
+      '**/postcss.config.js',
+      '**/postcss.config.cjs',
+      '**/tailwind.config.js',
+      '**/tailwind.config.cjs',
+      '**/vite.config.js',
+      '**/dist/**/*',
+      '!**/*.mjs',
+      '**/*.tsx',
+      '**/*.ts',
+      '**/*.json',
+      '**/dev-dist',
+      '**/dist',
+      'src-tauri/target/**/*',
+      '**/reverbGen.mjs',
+      '**/hydra.mjs',
+      '**/jsdoc-synonyms.js',
+      'packages/hs2js/src/hs2js.mjs',
+      '**/samples',
+    ],
+  },
+  ...compat.extends('eslint:recommended').map((config) => ({
+    ...config,
+    files: ['**/*.mjs', '**/*.js'],
+  })),
+  {
+    files: ['**/*.mjs', '**/*.js'],
+
+    plugins: {
+      import: fixupPluginRules(_import),
+    },
+
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.browser,
+      },
+
+      ecmaVersion: 'latest',
+      sourceType: 'module',
+    },
+
+    rules: {
+      'no-unused-vars': [
+        'warn',
+        {
+          destructuredArrayIgnorePattern: '.',
+          ignoreRestSiblings: false,
+        },
+      ],
+
+      'import/no-extraneous-dependencies': [
+        'error',
+        {
+          devDependencies: true,
+        },
+      ],
+    },
+  },
+];

package.json

@@ -21,7 +21,7 @@
     "osc": "cd packages/osc && npm run server",
     "jsdoc": "jsdoc packages/ -c jsdoc/jsdoc.config.json",
     "jsdoc-json": "jsdoc packages/ --template ./node_modules/jsdoc-json --destination doc.json -c jsdoc/jsdoc.config.json",
-    "lint": "eslint . --ext mjs,js --quiet",
+    "lint": "eslint . --quiet",
     "codeformat": "prettier --write .",
     "format-check": "prettier --check .",
     "report-undocumented": "npm run jsdoc-json && node jsdoc/undocumented.mjs > undocumented.json",
@@ -55,13 +55,17 @@
     "@strudel/xen": "workspace:*"
   },
   "devDependencies": {
+    "@eslint/compat": "^1.2.5",
+    "@eslint/eslintrc": "^3.2.0",
+    "@eslint/js": "^9.19.0",
     "@tauri-apps/cli": "^2.2.5",
     "@vitest/ui": "^3.0.4",
     "acorn": "^8.14.0",
     "dependency-tree": "^11.0.1",
     "eslint": "^9.18.0",
     "eslint-plugin-import": "^2.31.0",
     "events": "^3.3.0",
+    "globals": "^15.14.0",
     "jsdoc": "^4.0.4",
     "jsdoc-json": "^2.0.2",
     "lerna": "^8.1.9",