Hello - I'm trying to use OfficeUIFabricPeoplePicker, below is snippet which has error around beginbatch.

Upon further research, I found post which says spHttpClient.beginBatch is still in preview so it has now been moved to the plusbeta channel in SPFx. https://github.com/SharePoint/sp-dev-docs/issues/1956.
I'm using spfx 1.7.0 and spHttpClient.beginBatch is still in preview ? If so, is there any replacement ?
Thanks in advance.