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Bump is-animated@3.0.19 - #101173
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Bump is-animated@3.0.19#101173
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Tests PassedCommit: eb6868e |
styfle
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November 6, 2026 18:36
eps1lon
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MrIago
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Next.js now vendors is-animated 3 (vercel/next.js#101173). For WebP it reads the animation bit of the leading VP8X chunk, where version 2 took any `ANIM` bytes anywhere in the file. vinext ported version 2, so a still WebP whose data happened to contain `ANIM` was served as-is instead of being optimized, and an animated one flagged in VP8X without those bytes was flattened. Detection now reads 30 bytes instead of scanning the whole source. The new AVIF detection (`avis` brand) has no effect on the optimizer: Next.js only calls is-animated for GIF, PNG and WebP sources, so it still optimizes an animated AVIF, and vinext keeps doing the same. Refs cloudflare#4603 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Summary
Bumps
is-animatedfrom 2.0.2 to 3.0.19 and refreshes the vendored bundle and preserves CJS export now that upstream ships ESM.Performance
A local detection-only benchmark across 9 existing image fixtures measured 33–34% less detection time for an equally weighted mix: approximately 1.09 → 0.73 µs per call. This reproduced in two runs with 24 alternating A/B pairs per fixture on an Apple M3 Pro using Node.js 26.12.1, with buffers loaded before timing.
Results vary by format: animated GIF detection took about 38% less time, and the two animated PNG fixtures took 11–82% less time. Animated WebP took about 0.16 µs longer per call; static PNG, JPEG, and AVIF detection also took longer.
End-to-end image optimization was not benchmarked since these are µs improvements.