how to use mapgetters typescript vuex code example

Example: vuejs typescript mapactions

import { Action } from 'vuex-class'

@Component()
export default class UsersAdd extends Vue {
  userName: string = "";

  @Action('newUser')
  newUser!: (newUser: string) => void
  addUser() {
    console.log("...adding new user");
    this.newUser(this.userName);
  }
}