How to use the @gapi/core.Controller function in @gapi/core

GraphQLString,
  GraphQLNonNull
} from '@gapi/core';
import { ClientType } from './types/client.type';
import { Config, ConfigViews } from '../app.tokens';
import {
  mapComponentsPath,
  modifyViewsConfig
} from '../../helpers/component.parser';

export const viewsToArray = (a: { [key: string]: T }): Array =>
  Object.keys(a).reduce(
    (acc, curr) => [...acc, { ...a[curr], name: curr }],
    []
  );
@Controller({
  guards: [],
  type: []
})
export class ClientController {
  constructor(private pubsub: PubSubService) {}

  @Type(ClientType)
  @Subscribe(
    withFilter(
      function(self: ClientController) {
        return self.pubsub.asyncIterator('listenForChanges');
      },
      function(global, unused, payload, context) {
        const isCorrectLength = context.clientid.length + context.clientid.length;
        if (isCorrectLength === 100 && payload.clientId === context.clientid) {
          return true;