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.
Keep reading for $1What’s included，详情可参考WPS官方版本下载
，这一点在爱思助手下载最新版本中也有详细论述
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const output = Stream.pull(source, createLineParser());