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.
ВСУ запустили «Фламинго» вглубь России. В Москве заявили, что это британские ракеты с украинскими шильдиками16:45
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It was the most elite group of flying men ever assembled. They included Neil Armstrong, John Young and, fulfilling his childhood dream, Jim Lovell.
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In 1986, the Challenger spacecraft suffered a catastrophic failure seconds after launching, killing all seven crew members on board.，更多细节参见同城约会