prevent-hydration-mismatch-without-flickering

UI flickering during SSR hydration occurs because the server renders a default state while the client immediately updates it based on localStorage or cookies. This Skill injects a synchronous script to apply client-side data before the framework hydrates, ensuring the UI matches the expected state instantly.

The best way to apply a dark theme from cookies without UI flicker is to use a synchronous DOM update script before hydration. This approach updates the theme state immediately on load, avoiding the perceptible delay and visual change that happens when client-side preferences are applied after the initial render.

Yes, you can use this hydration fix for user authentication states in SSR. It is specifically designed to manage client-side data like authentication states and user preferences, ensuring the UI reflects the correct state immediately without causing Server-Side Rendering breakage or hydration mismatches.

Your React app flickers because the server renders an initial HTML state that differs from the client-side storage values applied during hydration. Injecting a synchronous script to update the DOM before hydration prevents this visual delay and ensures immediate correct rendering.

You do not need to reconfigure Server-Side Rendering itself to avoid hydration mismatches. This Skill prevents SSR breakage by injecting a synchronous script on the client that updates the DOM before the framework hydrates, bypassing direct browser API access during the initial render.