now.json

{
    "version": 2,
    "builds": [
      {
        "src": "nuxt.config.js",
        "use": "@nuxtjs/now-builder",
        "config": {}
      }
    ],
    "build": {"env":{
      "FIREBASE_APIKEY": "@firebase_apikey",
      "FIREBASE_AUTHDOMAIN": "@firebase_authdomain",
      "FIREBASE_DATABASEURL": "@firebase_databaseurl",
      "FIREBASE_PROJECTID": "@firebase_projectid",
      "FIREBASE_STORAGEBUCKET": "@firebase_storagebucket",
      "FIREBASE_MESSAGINGSENDERID": "@firebase_messagingsenderid",
      "FIREBASE_APPID": "@firebase_appid",
      "FIREBASE_MEASUREMENTID": "@firebase_measurementid",
      "GITHUB_CLIENTID":"@github_clientid",
      "GITHUB_CLIENTSECRET": "@github_secret"
    }},
    "env":{
      "FIREBASE_APIKEY": "@firebase_apikey",
      "FIREBASE_AUTHDOMAIN": "@firebase_authdomain",
      "FIREBASE_DATABASEURL": "@firebase_databaseurl",
      "FIREBASE_PROJECTID": "@firebase_projectid",
      "FIREBASE_STORAGEBUCKET": "@firebase_storagebucket",
      "FIREBASE_MESSAGINGSENDERID": "@firebase_messagingsenderid",
      "FIREBASE_APPID": "@firebase_appid",
      "FIREBASE_MEASUREMENTID": "@firebase_measurementid",
      "GITHUB_CLIENTID":"@github_clientid",
      "GITHUB_CLIENTSECRET": "@github_secret"
    }
  }