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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Bridging the gap between this and web streams
little help from an operator, and adoption of electronic technology at other
business for years and have thousands of customers per month.