Turbopack Worker Threads Rollback
Next.js reverted worker threads bundling support in Turbopack due to build errors with non-evaluatable modules. Version 16.1.1-canary.33 was also released.
Duration: PT1M26S
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: 2026-01-19T11:13:59Z
- Audio duration: PT1M26S
Transcript excerpt
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Good morning, this is Next.js Daily for Sunday, January 19th, 2026.
Tobias Koppers merged a significant revert today, rolling back Turbopack's worker threads bundling support. The feature, originally introduced in PR #87746, was causing build failures with the error "non-evaluatable module - Worker thread module must be evaluatable" when processing the thread-stream package. The…
This rollback highlights ongoing challenges in Turbopack's module evaluation system, particularly with Node.js worker threads that require runtime code execution. The build error suggests Turbopack couldn't statically analyze certain worker thread modules, forcing the team to pull the feature until a more robust…
The Next.js bot also pushed version 16.1.1-canary.33, updating package versions across the monorepo's 19 packages including core Next.js, ESLint configurations, and various utilities.
What's next: The team will likely need to redesign how Turbopack handles worker thread module bundling to support non-evaluatable code patterns. Developers using worker threads in Next.js applications should continue with the current stable implementation while this gets resolved.
That's your Next.js Daily update.
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