The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
Whether this data could be subject to government requests or legal processes
，更多细节参见爱思助手下载最新版本
MimikyuIntroduced in Gen VII (2016)
20+ curated newsletters