Hum.... I don't know if you have the same as me, but for me in realease 2.1.1 it says:

BREAKING CHANGE: users should import {StoreModule, Store} from '@ngrx/store' and provide the store as follows:

import {StoreModule, Store} from '@ngrx/store'
import {NgModule} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'

@NgModule({
  imports: [
    BrowserModule,
    StoreModule.provideStore(reducer, initialState)
  ]
})

So it says to use provideStore... not that it is deprecated... ?? I am also following the official app that does use provideStore... Where can we find the correct way to provide the store?

In the current release, the above usage is the correct way to use provideStore. In the next major release(V4) StoreModule.forRoot will be the correct way to provide store.