Summary
Next.js v16.4.0-canary.1 changes Turbopack’s filesystem watcher to avoid cloning paths already held in its map and adds instant validation for unstable_navigation(). It also improves graceful-fs tracing, missing-root-layout errors and Partial Prefetching adoption checks.
Why it matters
These pre-release changes target the feedback loop and diagnostics that shape day-to-day React application development, although their behaviour remains provisional.
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