JS SyncManager... broken?

Sendbird in js.

"sendbird": "^3.0.154",
"sendbird-syncmanager": "^1.1.27",

In a react-native app. Trying to get started with loading channels. Wasn’t able to create a new ChannelCollection. Then tried just logging as a sanity check:

import SendBirdSyncManager, {ChannelCollection} from 'sendbird-syncmanager';
console.log('ChannelCollection: ', ChannelCollection)
console.log('SendBirdSyncManager.ChannelCollection: ', SendBirdSyncManager.ChannelCollection)

// both return undefined

Anyone else having issues?