Preact in context of Astro and also in general
6 Feb. 2026 Given below are (possibly edited) extracts from a recent exchange with ChatGPT (CG). Me: In context of astro, please give me an overview of preact CG: Below is an Astro-specific, no-fluff overview of Preact , focusing on why it exists, how Astro uses it, and when you should (and should not) care . 1. What Preact is (one sentence) Preact is a lightweight, React-compatible UI library that implements the React API with a much smaller runtime. Think: React ≈ feature-rich, heavy Preact ≈ minimal, fast, React-shaped 2. Why Preact matters specifically in Astro Astro’s core philosophy is: Ship zero JavaScript by default. Hydrate only where needed. Preact fits this philosophy extremely well because: Tiny runtime (~3–4 KB gzipped) Fast hydration Same mental model as React Excellent for islands architecture Astro uses Preact as: A first-class UI framework A lighter alternative to React for interactive components 3. Astro + Preact architecture (important) Astro itself is not a S...