We have 15 links for you - the latest on JavaScript and tools

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Subject: Importing vs. fetching JSON; async loops; NaN and IEEE 754; URLPattern; Vitest 4.0; Biome v2.3; esbuild v0.25.11; JS compiler Porffor; source maps; JSConf 2025; ViteConf 2025

Importing vs. fetching JSON

jakearchibald.com @jakearchibald

Rethinking async loops in JavaScript

allthingssmitty.com @allthingssmitty

Why NaN !== NaN in JavaScript (and the IEEE 754 story behind it)

pzarycki.com @piotrzarycki

URLPattern is now Baseline Newly Available

web.dev

New versions

Vitest 4.0: Browser Mode stable, visual regression testing, Playwright trace files

voidzero.dev @trickroll @voidzero-dev

“TL;DR: Vitest 4.0 is released with Browser Mode being marked stable, Visual Regression testing support, and Playwright Trace support. The Vitest team will focus on performance improvement in the upcoming quarter. This major release includes breaking changes.”