Next.js Daily: Safari HMR Fix and Turbopack Improvements

The Next.js team merged 20 pull requests yesterday, with major fixes for CSS Hot Module Replacement on Safari and significant Turbopack optimizations for older browser support and performance.

Duration: PT2M8S

Episode overview

This episode is a short developer briefing from Next.js Daily.

It explains recent repository work in plain language.

  • Show: Next.js Daily
  • Published: 2026-04-01T10:03:35Z
  • Audio duration: PT2M8S

Transcript excerpt

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Good morning. This is Next.js Daily for April 1st, 2026.

Luke Sandberg merged a critical fix for CSS Hot Module Replacement on Safari. The issue stemmed from query string handling in script tags that was interfering with Safari's preload cache, preventing style updates during development. This was causing significant developer experience issues on Safari.

Niklas Mischkulnig contributed Turbopack improvements for targeting older browsers, addressing compatibility issues with legacy JavaScript engines. The team also optimized hot path performance by replacing regex-based file type checks with faster string operations using indexOf and startsWith.

Sandberg also simplified session-dependent task handling in Turbo Tasks, moving from runtime flags to compile-time attributes. This change enables better aggregation number selection and includes new TTL support for HTTP fetch operations that respect Cache-Control headers.

The team upgraded agent evaluation tools to version 0.9.5, adding new tests for Partial Pre-rendering knowledge. These evaluate whether the AI agent correctly decomposes monolithic loading components into granular Suspense boundaries.

Security improvements included pinning…

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