NativeScript iOS Daily: BroadcastChannel Performance and Cleanup
A single merged change, PR 543, optimizes BroadcastChannel to skip messages with no listeners and allow idle channels to be garbage-collected. The work also aligns delivery order and wakeups with web standards and is synced with Android.
Duration: PT1M55S
Episode overview
This episode is a short developer briefing from NativeScript iOS Daily.
It explains recent repository work in plain language.
- Show: NativeScript iOS Daily
- Published: 2026-11-09T14:12:28Z
- Audio duration: PT1M55S
Transcript excerpt
This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.
Good morning, it's Monday, November 9th, 2026.
Today's activity is narrow but significant: a single performance and correctness fix to broadcast messaging, with no wider pattern across the codebase.
Previously, every open broadcast channel deserialized every message sent to its name and fired two message events, even with no listener attached. The first ran on a hidden port, then a relay re-wrapped it onto the channel itself. That meant idle channels still paid full deserialization and dispatch costs. In pull…
The second part is lifetime and ordering. Before, a channel was held strongly until it was explicitly closed, so fire-and-forget senders that just opened, posted, and never closed piled up as permanent group members and slowed every future post. Now that strong hold is the only reference, matching web garbage…
For developers, short-lived broadcast channels should now be cheaper and safe to discard without an explicit close, and long-running apps with many channels should see less memory growth and CPU waste. The iOS change is kept in sync with its Android counterpart for cross-platform consistency.
That's today's briefing, thanks for listening.
Nearby episodes from NativeScript iOS Daily
- Wrapper Lifetime Overhaul and Thread-Safe Releases
- Faster CI and Safer Native Calls
- Startup Reliability Fixes and Leaner Toolchain
- Interop Moves to Builtin Modules
- iOS on Mac Boot Fix
- Chromium-Aligned Source Maps and Jasmine 7 Upgrade
- Messaging Reliability and Faster CI
- Safer Startup and Clearer Logs