How to use the arc.pollForAccountChanges function in arc

*/
    const currentAddress = getCachedAccount();
    let accountWasCached = false;
    if (currentAddress) {
      accountWasCached = true;
      // eslint-disable-next-line no-console
      console.log(`using account from local storage: ${currentAddress}`);
    }

    this.props.setCurrentAccount(currentAddress);
    /**
     * Only supply currentAddress if it was obtained from a provider.  The poll
     * is only comparing changes with respect to the provider state.  Passing it a cached state
     * will only cause it to get the wrong impression and misbehave.
     */
    pollForAccountChanges(accountWasCached ? null : currentAddress).subscribe(
      (newAddress: Address | null): void => {
        // eslint-disable-next-line no-console
        console.log(`new account: ${newAddress}`);
        this.props.setCurrentAccount(newAddress);
        if (newAddress) {
          cacheWeb3Info(newAddress);
        } else {
          uncacheWeb3Info();
          gotoReadonly(this.props.showNotification);
        }
      });
  }

console.log(`using address from cookie: ${currentAddressFromCookie}`);
        this.props.setCurrentAccount(currentAddressFromCookie);
      } else {
        this.props.cookies.set("currentAddress", "", { path: "/"});
        this.props.setCurrentAccount(undefined);
      }
    }

    try {
      metamask = await checkMetaMask();
    } catch (err) {
      console.log("MM not available or not set correctly: using default web3 provider: ", err.message);
    }

    if (metamask) {
      pollForAccountChanges(currentAddress).subscribe(
        (newAddress: Address) => {
          if (newAddress && checkMetaMask()) {
            console.log(`new address: ${newAddress}`);
            this.props.setCurrentAccount(newAddress);
            this.props.cookies.set("currentAddress", newAddress, { path: "/"});
            // TODO: we reload on setting a new account,
            // but it would be more elegant if we did not need to
            window.location.reload();
          }
        });
      }
  }