// 栈空 → 无更大元素，返回-1；栈非空 → 取栈顶（第一个更大值）
A difficulty here, however, is that the TransformStreamDefaultController does not have a ready promise mechanism like Writers do; so the TransformStream implementation would need to implement a polling mechanism to periodically check when controller.desiredSize becomes positive again.
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Media Source API — MDN Web Docs