is it possible to flush all batched events at once?

[lukehatcher]

I know there is

mixpanel.track('my event', {foo: 'bar'}, { 'send_immediately': true });

Similarly, I know I can edit the config - but that only effects following events, plus I still want batching.

mixpanel.set_config({ batch_requests: false });
// or
mixpanel.set_config({ batch_flush_interval_ms: 0 });

Use Case: I have a large batch_flush_interval_ms interval and want to flush everything before navigation to a new external URL, but I don't want to give up my batching and use send_immediately every time I call mixpanel.track

I have tried editing the flushAfter property of the events queued inside localStorage with no luck.