我正在使用，
"@angular/cdk": "^6.2.1",
"angularfire2": "^5.0.0-rc.10",
"firebase": "^4.13.1"
最佳答案
“angularfire2”存在问题:“^ 5.0.0-rc.10”
解决方案是卸载angularfire2^5.0.0-rc.10并安装angularfire2^5.0.0-rc.9:
npm uninstall angularfire2
npm install [email protected]