...
  **
  "scripts": [ ],
  **
  "environmentSource": "environments/environment.ts",
  "environments": {
    "dev": "environments/environment.ts",
    "prod": "environments/environment.prod.ts"
  }
  ...

...
"script": [
    "dev": "./dev-script.js",
    "prod": "./prod-script.js"
]
...