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.
一名白宫官员称，特朗普政府致力于确保所有美国企业获得关键矿产供应，“这包括与中国谈判并监督中方履行特朗普总统与习近平主席之间协议的情况，同时在必要时发展替代供应链。”
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