Next Js Daily: Turbopack's Rough Week
A cluster of Turbopack production bugs — shared runtime chunks, worker asset prefixes, CSS parsing, and stuck worker threads — got fixed and backported today, alongside a memory-retention fix in App Router request handling.
Duration: PT2M30S
Episode overview
This episode is a short developer briefing from Next Js Daily.
It explains recent repository work in plain language.
- Show: Next Js Daily
- Published: 2026-08-04T22:00:32Z
- Audio duration: PT2M30S
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 August 4th, and this is Next Js Daily.
The signal today is reliability triage in Turbopack's production path. Several fixes landed for bugs that only show up intermittently, in production builds, which makes them the hardest kind to catch before users do.
Start with the shared runtime chunk bug fixed in PR 96599 and backported in 96653. Turbopack could emit a runtime file missing top-level-await machinery, while other chunks still called into it — causing production builds to throw type errors, intermittently, depending on emission order. That's a nasty one because…
Second theme: worker lifecycle and asset routing. PR 96636 and a competing PR 96616 both address workers failing to load chunks correctly when an asset prefix is configured, tracing back to issue 96613. And PR 96592 fixes a real memory leak — failed plugin worker threads were staying alive indefinitely, holding onto…
Third, smaller but worth flagging: PR 96573 fixes request context retention in the App Router, where resolved params and search params promises could keep a request's async context alive in cache entries longer than needed — showing up as elevated retained memory.
Also notable: React was…
Nearby episodes from Next Js Daily
- Router Cache Correctness Under the Microscope
- Defaults Shift and a Batch of Bug Fixes
- Observability Gets a Major Upgrade
- Turbopack Gets Faster and More Configurable
- Cache Components and Bot Handling Get a Streaming Overhaul
- Closing the Gaps on Partial Prefetching and Turbopack Cleanup
- Turbopack's Server HMR Overhaul
- Request Insights Takes Shape