CODE EXAMPLE FOR JAVASCRIPT

deploy nestjs app engine

{
    ...
+  "main": "dist/main.js",
   "scripts": {
...
-    "build": "nest build",
+    "build": "tsc -p tsconfig.build.json",
+    "gcp-build": "npm run build",
...
-    "start": "nest start",
+    "start": "node ./dist/main.js",    
   }
...
}