diff --git a/.gitignore b/.gitignore
index 2da9478..c3593ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,40 +1,8 @@
 node_modules/
-yarn-error.log
-yarn.lock
-package-lock.json
-npm-debug.log
-
-.DS_Store
+dist/
+src/
+coverage/
+.nyc_output/
+*.log
 .env
-.env.local
-.env.development.local
-.env.test.local
-.env.production.local
-.pnp
-.pnp.js
-.pnp.cjs
-*.pnp.js
-*.pnp.cjs
-.cache/
-
-build/
-temp/
-*.gitignore
-.vscode
-
-# cache files for sublime text
-*.tmlanguage.cache
-*.tmPreferences.cache
-*.stTheme.cache
-
-# sftp configuration file
-sftp-config.json
-
-# Package control specific files
-Package Control.last-run
-Package Control.ca-list
-Package Control.ca-bundle
-Package Control.system-ca-bundle
-Package Control.cache/
-Package Control.ca-certs/
-bh_unicode_properties.cache
\ No newline at end of file
+.DS_Store
diff --git a/.nvmrc b/.nvmrc
new file mode 100644
index 0000000..209e3ef
--- /dev/null
+++ b/.nvmrc
@@ -0,0 +1 @@
+20
diff --git a/README.md b/README.md
index 65a604d..d33516f 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,9 @@ This generator creates a beginner-friendly starting point while still exposing r
 ## Requirements
 
 - Node.js 18+ (Node.js 20 recommended)
-- npm (or Yarn)
+- npm (recommended)
+
+The repository also declares supported runtime versions in `package.json` under `engines`.
 
 ## Quick start
 
@@ -62,6 +64,7 @@ Quality checks:
 ```bash
 npm run typecheck
 npm test
+npm run lint
 ```
 
 Environment toggles (optional):
diff --git a/package.json b/package.json
index 4e008b7..2e784f5 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,10 @@
     "test": "node --test -r ts-node/register _gulp/**/*.test.ts",
     "lint": "eslint \"_gulp/**/*.ts\""
   },
+  "engines": {
+    "node": ">=18.0.0",
+    "npm": ">=9.0.0"
+  },
   "author": "Raniro Coelho",
   "license": "MIT",
   "devDependencies": {
@@ -60,8 +64,5 @@
     "typescript": "^5.1.3",
     "vinyl-buffer": "^1.0.1",
     "vinyl-source-stream": "^2.0.0"
-  },
-  "dependencies": {
-    "immutable": "^4.3.7"
   }
 }