As of Firefox 146, I intend to enable the Iterator Sequencing proposal by default on all platforms. It is currently available in Nightly builds, but disabled by default and controlled by the `javascript.options.experimental.iterator_sequencing` preference. The proposal adds a new `Iterator.concat` method that builds an iterator over its iterable arguments. Our implementation was contributed by André Bargull, thank you!
The proposal reached Stage 3 of the TC39 process at the July 2025 plenary, Safari shipped their implementation in 18.4 ( https://developer.apple.com/documentation/safari-release-notes/safari-18_4-release-notes), work does not appear to have started in Chromium ( https://issues.chromium.org/issues/434977727). Bug to turn on by default: https://bugzilla.mozilla.org/show_bug.cgi?id=1986672 Standard: https://github.com/tc39/proposal-iterator-sequencing -- You received this message because you are subscribed to the Google Groups "[email protected]" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/a/mozilla.org/d/msgid/dev-platform/CAC_Rxa7DW9J1FFsrGTJjX-RN9pC-6oLQ%2B%2Biv8%3DQi7kfrS6et%3Dg%40mail.gmail.com.
