CountQueuingStrategy
This Streams API interface provides a built-in byte length queuing strategy that can be used when constructing streams.
interface CountQueuingStrategy  extends QueuingStrategy {
readonly highWaterMark: number;
readonly size: QueuingStrategySize;
}var CountQueuingStrategy: {
prototype: CountQueuingStrategy; 
new (init: QueuingStrategyInit): CountQueuingStrategy; 
};