The design of Web streams predates async iteration in JavaScript. The for await...of syntax didn't land until ES2018, two years after the Streams Standard was initially finalized. This timing meant the API couldn't initially leverage what would eventually become the idiomatic way to consume asynchronous sequences in JavaScript. Instead, the spec introduced its own reader/writer acquisition model, and that decision rippled through every aspect of the API.
然而，儘管評論者一致認為大約一半內容已落實，仍然有一半尚未實現，包括：
。WPS下载最新地址对此有专业解读
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Notice the block [anyVar] is used to reference variables where the configuration block should be applied. This avoids raw strings for variable names and keeps these configs friendly to development tools: