# Next.js v16.4.0-canary.4

- Product: Next.js (https://whatsnew.fyi/product/next-js)
- Vendor: Vercel
- Date: 2026-08-24
- Version: v16.4.0-canary.4
- Original notes: https://github.com/vercel/next.js/releases/tag/v16.4.0-canary.4
- Permalink: https://whatsnew.fyi/product/next-js/releases/v16.4.0-canary.4
- Labels: Pre-release

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — Add next/cache-handlers types entrypoint
- **changed** — Remove unused return values from getPageStaticInfo
- **changed** — Defer NFT module content hashes in turbopack
- **changed** — Turn off the adapter route collapses by default
- **changed** — Serve a run of fallback shells from one route entry
- **changed** — Stop emitting a separate route entry for a dynamic route's RSC form
- **changed** — Stop emitting a redundant route per prefetch segment
- **changed** — Compile conditional cell updates once instead of per cell type in turbo-tasks
- **changed** — Migrate remaining async blocks to async closures

###### Misc Changes

- Add next/cache-handlers types entrypoint: #97592
- Remove unused return values from getPageStaticInfo: #97661
- [turbopack] defer NFT module content hashes: #97773
- test: deflake basePath external navigation: #97611
- docs(adapters): document assetsHashes and routing.middlewareMatchers: #96536
- Migrate remaining async blocks to async closures: #97701
- Turn off the adapter route collapses by default: #97774
- Serve a run of fallback shells from one route entry: #97738
- [test] Capture the route table for apps with several param shapes: #97728
- Stop emitting a separate route entry for a dynamic route's RSC form: #97726
- Stop emitting a redundant route per prefetch segment: #97720
- [test] Capture the dynamic routes a build passes to an adapter: #97719
- turbo-tasks: compile conditional cell updates once, not per cell type: #97763
- Turbopack: add unit test coverage for FileSystemPath::hash_file: #97743

###### Credits 

Huge thanks to @marceloboeira, @mischnic, @sokra, @leejpsd, @unstubbable, and @lukesandberg for helping!