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emotion-pro
Style React with Emotion: css prop, styled API, theming, SSR, and zero-config patterns. Use when choosing or using Emotion for CSS-in-JS.
skills/emotion-pro/SKILL.md
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# Emotion Pro
A practical guide to Emotion: the flexible CSS-in-JS library for React — the `css` prop, `styled` API, theming, SSR extraction, and the configuration choices (babel preset, labels) that make it pleasant.
## Overview
Emotion offers two APIs for the same engine: the **`css` prop** (`<div css={css`...`}>`, JSX pragma or automatic runtime) for inline styling, and **`styled`** (same idea as styled-components) for reusable components. It's fast, SSR-friendly, and framework-agnostic at its core (`@emotion/css` works without React). The `css` prop shines for one-off styles; `styled` for repeated components — most codebases use both.
## When to use
- React apps wanting flexible CSS-in-JS (css prop for ad-hoc, styled for reusable).
- Theming with `ThemeProvider` from `@emotion/react`.
- SSR (Next.js, Remix, custom) with critical CSS extraction.
- Non-React usage via `@emotion/css` (vanilla JS, other frameworks).