WebStreamsUnderlyingDefaultSourceinterface UnderlyingDefaultSourceType Parameters ##R = any Properties ##cancel: UnderlyingSourceCancelCallback optional#pull: (controller: ReadableStreamDefaultController<R>) => void | PromiseLike<void> optional#start: (controller: ReadableStreamDefaultController<R>) => any optional#type: undefined optional
interface UnderlyingDefaultSourceType Parameters ##R = any Properties ##cancel: UnderlyingSourceCancelCallback optional#pull: (controller: ReadableStreamDefaultController<R>) => void | PromiseLike<void> optional#start: (controller: ReadableStreamDefaultController<R>) => any optional#type: undefined optional