模拟Firebase数据库触发器功能错误：尚不支持服务“ firebaseio.com”

更新：已解决！在firebase-toolsNPM包需要更新到最新版本。

我试图firebase experimental:functions:shell在终端中使用Firebase的命令模拟/测试我的云功能（特别是数据库触发器）。

结果是，我的HTTP函数可以仿真，但是每个Firebase数据库触发器函数都会出错：

Your requested "node" version "6" doesn't match your global version "8"
✔  functions: Emulator started at http://localhost:5001
i  functions: Watching "/Users/****/Documents/Websites/***** - Other/cloud-functions/" for Cloud Functions...
⚠  Default "firebase-admin" instance created!
⚠  Ignoring trigger "CF_NAME_HIDDEN_1" because the service "firebaseio.com" is not yet supported.
⚠  Ignoring trigger "CF_NAME_HIDDEN_2" because the service "firebaseio.com" is not yet supported.
⚠  Ignoring trigger "CF_NAME_HIDDEN_3" because the service "firebaseio.com" is not yet supported.
i  functions: HTTP trigger initialized at http://localhost:5001/****-****/us-central1/CF_NAME_HIDDEN_4

我不明白为什么会收到此错误或其含义：

正在忽略触发器...，因为尚不支持“ firebaseio.com”服务。

我的package.json包括：

"firebase": "4.6.2",
"firebase-admin": "^7.4.0",
"firebase-functions": "^2.2.1",
...
"devDependencies": {
   "firebase-functions-test": "^0.1.6"
},