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.
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中国式现代化，民生为大。新征程上，那句誓言须臾不可忘记——
Josh walks two hours into the city centre for a food parcel