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CSS-in-JS

CSS-in-JS from core concepts and styled-components basics to Emotion, theming, dynamic styles, zero-runtime libraries (Vanilla Extract, Panda CSS, Linaria), SSR hydration, RSC compatibility, and migrating away from runtime solutions.

CSS-in-JS

What is CSS-in-JS and why does it exist?

styled-components basics

Emotion basics

CSS-in-JS vs CSS Modules vs utility-first

Runtime vs zero-runtime CSS-in-JS

Global styles in CSS-in-JS

Keyframe animations

ThemeProvider and theming

Dynamic styles based on props

Vanilla Extract — zero-runtime type-safe CSS

Linaria — zero-runtime with familiar syntax

Panda CSS

SSR and style hydration

TypeScript integration

styled-components v6 changes

RSC incompatibility with runtime CSS-in-JS

Performance: runtime cost and critical CSS extraction

Vanilla Extract: sprinkles, themes, and contract

Migrating away from runtime CSS-in-JS

CSS-in-JS in a design system library