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.
class CsvStorage(Storage):
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这也意味着，平台之间的分化将不可避免。具备规模、技术与资本优势的头部平台，或许有空间完成这次转型；而依赖单一抽佣模式、缺乏能力积累的平台，则可能在这一过程中被淘汰。
The async iterator based approach provides a natural bridge between this alternative approach and Web streams. When coming from a ReadableStream to this new approach, simply passing the readable in as input works as expected when the ReadableStream is set up to yield bytes:
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