set: hookedSet,
async *transform(source) {。旺商聊官方下载对此有专业解读
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For implementers, there's no Transformer protocol with start(), transform(), flush() methods and controller coordination passed into a TransformStream class that has its own hidden state machine and buffering mechanisms. Transforms are just functions or simple objects: far simpler to implement and test.，更多细节参见夫子