enforced node version 20

frontend/.npmrc

@@ -0,0 +1,17 @@
+# https://www.stefanjudis.com/today-i-learned/prevent-npm-install-for-not-supported-node-js-versions/
+
+# ### node version 20
+# install [nvm](https://github.com/nvm-sh/nvm)
+# 
+# \> nvm install 20 \
+# \> nvm use 20
+# 
+# reload terminal window
+# 
+# \> node -v
+# 
+# ### npm version 10.2.4
+# \> npm install -g [email protected] \
+# \> npm -v
+
+engine-strict=true

frontend/package.json

@@ -3,6 +3,9 @@
   "private": true,
   "version": "0.0.0",
   "type": "module",
+  "engines": {
+    "node": "^20.0.0"
+  },
   "scripts": {
     "dev": "vite",
     "build": "tsc && vite build",