chore(eslint): configure ESLint for TS and JS

.vscode/extensions.json

@@ -1,5 +1,6 @@
 {
   "recommendations": [
     "editorconfig.editorconfig",
+    "dbaeumer.vscode-eslint",
   ]
 }

eslint.config.js

@@ -0,0 +1,33 @@
+// @ts-check
+
+import eslint from '@eslint/js'
+import globals from 'globals'
+import tseslint from 'typescript-eslint'
+
+export default tseslint.config(
+  eslint.configs.recommended,
+  tseslint.configs.strictTypeChecked,
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+  {
+    files: ['**/*.js'],
+    extends: [
+      tseslint.configs.disableTypeChecked,
+    ],
+    languageOptions: {
+      ecmaVersion: 'latest',
+      globals: { ...globals.node },
+      sourceType: 'module',
+    },
+  },
+  {
+    ignores: ['out/*'],
+  },
+)

package.json

@@ -4,7 +4,8 @@
   "private": true,
   "scripts": {
     "dev": "node scripts/dev.js",
-    "build": "tsc -noEmit -skipLibCheck && node scripts/esbuild.build.js production"
+    "build": "tsc -noEmit -skipLibCheck && node scripts/esbuild.build.js production",
+    "test:eslint": "eslint --cache --cache-location out/.eslintcache"
   },
   "keywords": [
     "obsidian.md",
@@ -14,12 +15,16 @@
   "author": "Kirill Gavrilov",
   "license": "MIT",
   "devDependencies": {
+    "@eslint/js": "9.18.0",
     "@types/node": "22.10.7",
     "enquirer": "2.4.1",
     "esbuild": "0.24.2",
+    "eslint": "9.18.0",
+    "globals": "15.14.0",
     "obsidian": "1.7.2",
     "obsidian-utils": "0.10.2",
-    "typescript": "5.7.3"
+    "typescript": "5.7.3",
+    "typescript-eslint": "8.21.0"
   },
   "packageManager": "pnpm@9.15.4"
 }