installed eslint

node/package.json

@@ -3,6 +3,7 @@
     "version": "2.0.0",
     "description": "flag/bitflag helper",
     "main": "index.js",
+    "type": "module",
     "repository": {
         "type": "git",
         "url": "git+https://github.com/louisdevie/multiflag.git"
@@ -21,9 +22,10 @@
         "build": "tsup",
         "postbuild": "cp package.json README.md ../LICENSE dist",
         "test": "vitest --ui",
+        "lint": "eslint",
         "coverage": "vitest run --coverage",
         "type-check": "tsc --noEmit",
-        "format": "prettier --write src/ tests/"
+        "format": "prettier --write src/ tests/ *.js *.ts"
     },
     "tsup": {
         "entry": [
@@ -36,12 +38,17 @@
         "clean": true
     },
     "devDependencies": {
+        "@eslint/js": "^10.0.1",
         "@vitest/coverage-v8": "^4.0.18",
         "@vitest/ui": "^4.0.18",
+        "eslint": "^10.0.2",
+        "eslint-plugin-simple-import-sort": "^12.1.1",
+        "globals": "^17.4.0",
         "prettier": "^3.8.1",
         "ts-node": "^10.9.2",
         "tsup": "^8.5.1",
         "typescript": "^5.9.3",
+        "typescript-eslint": "^8.56.1",
         "vitest": "^4.0.18"
     }
 }