Typescript Error Module '" Source/node_modules/firebase/index"' has no exported member 'functions'

错误信息：

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Typescript Error

Module '"D:/Source/node_modules/firebase/index"' has no exported member 'functions'.

D:/Source/node_modules/@angular/fire/firebase.app.module.d.ts

	import { InjectionToken } from '@angular/core';
	import { app, auth, database, firestore, functions, messaging, storage } from 'firebase/app';
	export declare type FirebaseOptions = {

Ionic Framework: 3.8.0 Ionic Native: 2.9.0 Ionic App Scripts: 3.2.0 Angular Core: 4.4.3 Angular Compiler CLI: 4.4.3 Node: 8.11.3 OS Platform: Windows 10 Navigator Platform: Win32 User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

解决办法：

修改firebase版本，把"firebase": "^4.6.1",改为"firebase": "^5.5.7",

修改angular版本，把所有4.4.3改为5.0.0,例如："@angular/common": "4.4.3",改为"@angular/common": "5.0.0",

修改rxjs版本，把"rxjs": "5.4.2",改为"rxjs": "5.5.2",