How to use the scheduler.unstable_next function in scheduler

warning(
            false,
            'Relay: Unexpected fetch while using a null fragment ref ' +
              'for fragment `%s` in `%s`. When fetching more items, we expect ' +
              "initial fragment data to be non-null. Please make sure you're " +
              'passing a valid fragment ref to `%s` before paginating.',
            fragmentNode.name,
            componentDisplayName,
            componentDisplayName,
          );
        }

        if (onComplete) {
          // We make sure to always call onComplete asynchronously to prevent
          // accidental loops in product code.
          Scheduler.unstable_next(() => onComplete(null));
        }
        return {dispose: () => {}};
      }

      invariant(
        fragmentSelector != null &&
          fragmentSelector.kind !== 'PluralReaderSelector',
        'Relay: Expected to be able to find a non-plural fragment owner for ' +
          "fragment `%s` when using `%s`. If you're seeing this, " +
          'this is likely a bug in Relay.',
        fragmentNode.name,
        componentDisplayName,
      );

      const parentVariables = fragmentSelector.owner.variables;
      const fragmentVariables = fragmentSelector.variables;

return;
    }
    if (this.state.strategy !== 'async') {
      flushSync(() => {
        this.setState(state => ({
          showDemo: !state.showDemo,
        }));
      });
      return;
    }
    if (this._ignoreClick) {
      return;
    }
    this._ignoreClick = true;

    Scheduler.unstable_next(() => {
      this.setState({showDemo: true}, () => {
        this._ignoreClick = false;
      });
    });
  };