这个问题/错误不断弹出堆栈溢出
普遍的共识是将firebase回滚到“firebase”：“4.8.0”，
在我的情况下，这并没有解决问题。
[14:29:11] typescript: C:/projects/Ionic/node_modules/@firebase/database/dist/esm/src/api/Database.d.ts, line: 4
Cannot find module '@firebase/app-types/private'.
还有其他人在回滚后还面临这个问题吗？
"dependencies": {
"@angular/common": "5.0.3",
"@angular/compiler": "5.0.3",
"@angular/compiler-cli": "5.0.3",
"@angular/core": "^5.2.0",
"@angular/forms": "5.0.3",
"@angular/http": "5.0.3",
"@angular/platform-browser": "5.0.3",
"@angular/platform-browser-dynamic": "5.0.3",
"@firebase/app-types": "^0.1.1",
"@ionic-native/core": "4.4.0",
"@ionic-native/splash-screen": "4.4.0",
"@ionic-native/status-bar": "4.4.0",
"@ionic/storage": "2.1.3",
"@ngrx/core": "^1.2.0",
"@ngrx/effects": "^4.1.1",
"@ngrx/store": "^4.1.1",
"add": "^2.0.6",
"angularfire2": "^5.0.0-rc.4",
"cordova-android": "7.0.0",
"cordova-plugin-device": "^1.1.7",
"cordova-plugin-ionic-webview": "^1.1.16",
"cordova-plugin-splashscreen": "~4.0.1",
"cordova-plugin-whitelist": "^1.3.3",
"firebase": "4.8.0",
"install": "^0.10.2",
"ionic-angular": "3.9.2",
"ionic-plugin-keyboard": "^2.2.1",
"ionicons": "3.0.0",
"rxjs": "5.5.2",
"sw-toolbox": "3.6.0",
"typings": "^2.1.1",
"zone.js": "0.8.18"
},