using npm @types is the way to add typings in typescript 2. And using
C:\myapps\ionic2-tests\mmsapp>npm install @types/firebase --save-dev --save-exact
ionic-hello-world@ C:\myapps\ionic2-tests\mmsapp
`-- @types/firebase@2.4.30
installs firebase API 2.4.30 and not 3.0 so hence we are getting these errors.
looks like wait till firebase3 typings are released as npm @types is the only way? or there any way we can generate @types?