Shimmer is absent in package 1.5.1

[Krak86]

I am building the SPFx webpart (1.5.1 version) using yeoman, and it deploys the same fabric core version automatically (1.5.1).
I chose the React framework. So in project's package.json I see "@microsoft/sp-office-ui-fabric-core": "1.5.1" only, no direct office-ui-fabric-react packages.

Usually when I am importing a Fabric components I am using the next path, for instance:
import { Spinner, SpinnerSize } from 'office-ui-fabric-react/lib/Spinner';
import { Pivot, PivotItem } from 'office-ui-fabric-react/lib/Pivot';

When I am trying to import Shimmer component:
import { Shimmer } from 'office-ui-fabric-react/lib/Shimmer';
the IDE says "Cannot find module 'office-ui-fabric-react/lib/Shimmer'".

I checked the node_modules folder and also didn't find the Shimmer component there.

How can I handle it? Is it removerd from 1.5.1 version or should I add it separately somehow?

[Vitalius1]

Shimmer is only part of the office-ui-fabric-react package and never was intended to get into the core. What does @microsoft/sp-office-ui-fabric-core": "1.5.1" include? Can you look in the node_modules folder and see?

[Krak86]

I checked the node_modules folder and also didn't find the Shimmer component there.
Indeed I did, but nothing there.