Typescript vue apollo

example.ts

    import {Vue, Component} from "vue-property-decorator";
    import {user} from "packs/types/user";

    @Component({
        apollo: {
            user: {
                query: require('../graphql/user.graphql'),
                loadingKey: 'loading',
                subscribeToMore: {
                    document: require('../graphql/user_updates.graphql'),
                    updateQuery: (previousResult, {subscriptionData}) => {
                        if (previousResult.id === subscriptionData.data.profileUpdated.id) {
                            return {
                                user: subscriptionData.data.profileUpdated
                            }
                        }
                    },
                },

                update(data): user {
                    return data.user
                },
                // Optional result hook
                result({data, loader, networkStatus}) {
                    this.loading = false;
                },
                // Error handling
                error(error) {
                    console.error('We\'ve got an error!', error)
                },
            }
        },
    })
    export default class App extends Vue{
        user: user = <user> {};
        loading: boolean = true;
    }