v16.3.0-preview.10

Misc Changes

• Unify allow-runtime with Partial Prefetching: #96106
• Attempt static prefetch before resorting to runtime: #96095
• Block prefetch task until sufficient response is received: #96017
• Use a safe clock for Request Insights bookkeeping: #96274
• Count key length in remaining byte-budgeted LRUs: #96231
• Serve cached misses from the filesystem route cache: #96230
• Count URL key length in the filesystem route cache LRU: #96229
• Turbopack: Only extend the watcher's batch window for unfiltered events: #96186
• Turbopack: Store watcher batch state with bitflags instead of 4 different sets: #96114
• docs: document query-only href resolution and fix with-vercel-blob : #96280
• Micro-optimization for string format: #95774
• Upgrade React from 28cd4bb0-20260723 to 756fdd47-20260727: #96270
• [test] Unflake more tests: #96081
• [test] Run the navigation e2e suite under cacheComponents: #95877
• [test] Run more test suites under cacheComponents flag, again: #96196
• [test] Unflake a prefetch-related race: #96222
• docs(ai-agents): restructure as steps and close 16.2/16.3 coverage gaps: #96247
• Replace vendored http-proxy with httpxy: #96060
• Update vendored @mswjs/interceptors to 0.41.9: #96059
• Track whether runtime data is accessed during prefetch: #95964
• Add Instant Insights request timing: #95958
• [turbopack] Tree-shake module.exports = {...} (CJS): #95996
• [turbopack] Fix de-opt in getChunkRelativeUrl(): #96183
• Add shell offset to static segment prefetches: #95963
• Turbopack: support import.meta.glob caseSensitive option: #96226
• fix(sandbox): release one-shot timeout ids after they run: #96161
• Fix dev overlay symbolication for project paths needing percent-encoding: #96221
• [internal] Add a skill for benching changes in a sandbox: #95943
• Run dev validation in process when using Webpack: #96219
• Read chunk source maps from disk in the dev validation worker: #96218
• Retry the source map lookup with a plain path: #96215
• Pass fallback params to the dev validation worker as maps: #96210
• [sourcemaps] Reuse source map payloads and consumers across stack frames: #96198
• fix: release compression stream when client disconnects mid-response: #96173
• Run Cache Components dev validation on a worker thread: #96153
• Add a benchmark for dev Cache Components validation on a worker thread: #96152
• [test] Unflake the enabled-features-trace test suite: #96175
• [refactor] Prepare dev validation for running on a worker thread: #96151
• Add the experimental.devValidationWorker config flag: #96150
• [refactor] Model dev validation render outputs as a discriminated union: #96149
• Forward dev invalid dynamic usage errors from the render, not validation: #96148
• Optimize implicit cache tag derivation: #96120
• Avoid quadratic HMR queue shifts: #96137
• [sourcemaps] Use file: sourcemaps for Turbopack to improve dev performance: #95946
• Give RouteCacheEntry a single hidden class across its lifecycle: #96164
• Keep optimistic-route param handling monomorphic: #96169
• Store RouteTree slots in a Map to keep slot access monomorphic: #96168
• Make reifyRouteTree object literals match the canonical RouteTree key order: #96162
• Keep VaryPath monomorphic by making isRootParam required: #96122
• docs: expand and modernize the Single-Page Applications guide: #95860
• docs: navigation interrupts after streaming has started (notFound, forbidden, unauthorized): #95851
• docs: reframe prefetching around automatic vs. controllable behavior: #95896
• docs(view-transitions): fix the skill install command: #96142
• Include additional prerender metadata about build-time routes: #96080
• Optimize app page entry analysis: #96058
• [ts-plugin] Preserve TypeScript quick info metadata: #95863
• [turbopack] Import Webpack's tests for tree-shaking: #95811
• [turbopack] Drop dead require() calls: #95718
• [turbopack] Track usage of modules imported with require(): #95717
• Return plain text 404 for non-document requests to unknown paths: #95930
• [RSC HMR] Fix a flurry of refetches when a editing component imported from many routes: #96102
• [turbopack] Track re-exports in import_usage inside of compute_import_usage: #95989
• Turbopack: Very minor improvements for watcher loop: #96103
• Turbopack: Refactor watcher event handling and batching logic: #96087
• fix: remove deprecated url.parse() from custom-server example: #96105
• Upgrade React from 711c445b-20260722 to 28cd4bb0-20260723: #96100
• Throw for empty or incomplete generateStaticParams results with output: export: #95969
• Throw when generateStaticParams returns invalid values: #95968
• Remove inert experimental.viewTransition flag: #96098
• Restore partial fallback shell upgrade coverage: #96096
• fix(next/font/google): bound Google Fonts fetch timeout on Turbopack: #95981
• Rewrite edge server source map sources in Rust, drop JS fallback: #95980
• docs: view transitions guide — skill section, source-audit fixes, flag-removal docs: #96097
• Restore canary version 16.3.0-canary.94 after v16.3.0-preview.9 preview release

Credits

Huge thanks to @acdlite, @DavidIlie, @gaearon, @bgw, @icyJoseph, @jimmyhmiller, @vercel-release-bot, @aurorascharff, @eps1lon, @timneutkens, @sampoder, @petehunt, @unstubbable, @marcoshernanz, @gnoff, @devjiwonchoi, @wasim-builds, and @lukesandberg for helping!