Web streams has no synchronous path. Even if your source has data ready and your transform is a pure function, you still pay for promise creation and microtask scheduling on every operation. Promises are fantastic for cases in which waiting is actually necessary, but they aren't always necessary. The new API lets you stay in sync-land when that's what you need.
Wikipedia calls it DTD-1 for some reason, but IBM sources consistently，更多细节参见搜狗输入法下载
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