Nodestream/webUnderlyingSourceinterface UnderlyingSourceType Parameters ##R = anyProperties #optional#cancel: UnderlyingSourceCancelCallbackoptional#pull: UnderlyingSourcePullCallback<R>optional#start: UnderlyingSourceStartCallback<R>optional#type: undefined
interface UnderlyingSourceType Parameters ##R = anyProperties #optional#cancel: UnderlyingSourceCancelCallbackoptional#pull: UnderlyingSourcePullCallback<R>optional#start: UnderlyingSourceStartCallback<R>optional#type: undefined