If you’re interested in more details, check out the Component Book or watch “What is a Component?”.
Мир Российская Премьер-лига|19-й тур
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但是他偶爾仍須向民眾，尤其是黨內幹部，保證他的做法具有一定合理性。
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.