代码中定义了一个 primitives 对象，里面藏着 20 多种不同的几何体生成函数。让我们挑几个常用模型进行分析：
In JavaScript, the natural primitive for "a sequence of things that arrive over time" is already in the language: the async iterable. You consume it with for await...of. You stop consuming by stopping iteration.
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const first = await peekFirstChunk(stream);