# Next.js v16.4.0-canary.0

- Product: Next.js (https://whatsnew.fyi/product/next-js)
- Vendor: Vercel
- Date: 2026-08-21
- Version: v16.4.0-canary.0
- Original notes: https://github.com/vercel/next.js/releases/tag/v16.4.0-canary.0
- Permalink: https://whatsnew.fyi/product/next-js/releases/v16.4.0-canary.0
- 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** — isolate HMR listeners across microfrontends in Turbopack
- **changed** — deduplicate Pages Router app chunks in Turbopack
- **changed** — split the read and write codepath data structures for symlinks in Turbopack
- **fixed** — preserve trailing slash during export MPA fallback
- **changed** — show last modified file when waiting for the filesystem to settle in Turbopack
- **changed** — check assignability before assigning the actor in react-sync

###### Misc Changes

- feat(turbopack): isolate HMR listeners across microfrontends: #95997
- Turbopack: deduplicate Pages Router app chunks: #97664
- [react-sync] Check assignability before assigning the actor: #97638
- fix: preserve trailing slash during export MPA fallback: #97613
- Turbopack: Split the read and write codepath data structures for symlinks: #97395
- Turbopack: Show last modified file when waiting for the filesystem to settle: #97648

###### Credits 

Huge thanks to @fireairforce, @mischnic, @eps1lon, @QingHeSite, and @bgw for helping!