Astro migration: switch without downtime
An executable path for moving an existing project to Astro, with a rollback plan.
Quick answer
Which Astro version stabilized @tailwindcss/vite integration?
Astro 5 officially recommends the @tailwindcss/vite plugin over the legacy PostCSS pipeline. Before upgrading, lock the major versions of astro and tailwind together so the new plugin does not silently ignore v3 config.
Machine-readable page data: /data/astro-migration.json
In-depth analysis
Astro's Islands Architecture ships zero client-side JavaScript by default and pushes first-paint performance to the limit; content sites use it to pre-render static HTML at build time and serve it directly from edge nodes. Migration runs in parallel with validation and gradual cutover — keep a switch that rolls back in seconds so business never breaks.
// astro.config.mjs — static SSG + Cloudflare Pages edge delivery
import { defineConfig } from 'astro/config';
import tailwindcss from '@tailwindcss/vite';
export default defineConfig({
site: 'https://aicode8.com',
output: 'static',
vite: { plugins: [tailwindcss()] },
});Astro Migration · Key takeaways
- Full branch build passes
- All 8 Preview drills green
- Production and Preview KV isolated
- Rollback switch ready
FAQ & pitfalls
How do I invalidate cache after deploying an Astro static site to Cloudflare Pages?
Each git commit triggers an atomic rebuild that replaces the full static output as a whole. Set HTML to must-revalidate and static assets to immutable long cache — no manual CDN purge required.
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What readers are asking
Questions that keep coming back in reader feedback, already answered.
- 01
Why is my Astro component's interactivity not working?
Components ship as zero-JS HTML by default, so an interactive one needs a client:* directive (client:load, client:visible, …). Without it the script is never bundled into the page.
See the full guide → - 02
Which Astro version supports the @tailwindcss/vite integration reliably?
Astro 5 and later officially recommend the @tailwindcss/vite plugin over the old PostCSS route. Pin the astro and tailwind major versions before upgrading, or the new plugin silently ignores your v3 config.
See the full guide → - 03
Why is my custom Tailwind v4 brand colour not applied?
Colours must be declared in @theme (for example --color-brand). A missing @tailwindcss/vite plugin, or a leftover v3 config, makes bg-brand silently render nothing.
See the full guide →