The Streams standard has been updated with a new utility method ReadableStream.from(asyncIterable), which adapts any sync or async iterable into a ReadableStream.

Specification: https://streams.spec.whatwg.org/#rs-from
Spec change: whatwg/streams#1083
WPT tests: web-platform-tests/wpt#27009