v0.0.55

What's Changed

New Features

• Added experimental appShells configuration option with validation support
• Added support for Sparkle experimental flags: varyParams, optimisticRouting, and cachedNavigations
• Added layout safety observation foundations for improved skip optimization
• Added static layout reuse proof model for better performance analysis

Bug Fixes

• Fixed app router navigation to better align with Next.js behavior
• Fixed Pages Router to properly run _document.getInitialProps with renderPage enhancers
• Fixed Head component to preserve charset and viewport defaults during client hydration
• Fixed Pages Router to deduplicate in-flight _next/data fetches by URL to prevent redundant requests
• Fixed Head component to match Next.js charset/viewport ordering and properly merge _document.getInitialProps head elements
• Fixed TypeScript next.config loading to keep packages externalized
• Fixed TypeScript config resolution to properly handle baseUrl imports from tsconfig.json
• Fixed server-only imports to work correctly from 'use server' modules
• Fixed fnv1a64 hash function to produce consistent fixed-width output
• Fixed App Router to preserve forwarded action redirect wrappers
• Fixed App Router to reuse pending prefetched RSC payloads for better performance
• Fixed App Router to preserve middleware headers on metadata routes
• Fixed Pages Router to preserve import.meta.url source paths
• Fixed server-only imports to be properly rejected from client-reachable modules

Performance

• Improved memory management with bounded default cache size and LRU eviction
• Enhanced ISR cache key generation to include i18n context for better cache accuracy

Internal / Chores

• Updated @vitejs/plugin-rsc dependency to version 0.5.27
• Added regression test for parallel slot page-over-default priority

Contributors

@NathanDrake2406
@james-elicx
@southpolesteve
@Divkix