Antigravity Agent
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10_Wiki/Topics 대규모 정리: - 오류 캡처/미완성 stub 문서 227개 제거 - 교차폴더 중복 43클러스터 병합 (63파일 → redirect) - 링크명 정규화: 깨진 링크 수정·redirect 직결·개념 매핑 ~2,400건 - 카테고리 MOC 6개 신규 생성 - Graph 섹션 미해결 related-keyword 링크 10,058건 제거 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
248 lines
7.5 KiB
Markdown
248 lines
7.5 KiB
Markdown
---
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id: wiki-2026-0508-style-registry
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title: Style Registry
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category: 10_Wiki/Topics
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status: verified
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canonical_id: self
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aliases: [SSR Style Registry, useServerInsertedHTML, CSS-in-JS SSR]
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duplicate_of: none
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source_trust_level: A
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confidence_score: 0.9
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verification_status: applied
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tags: [frontend, ssr, css-in-js, nextjs, react, app-router]
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raw_sources: []
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last_reinforced: 2026-05-10
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github_commit: pending
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tech_stack:
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language: typescript
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framework: nextjs
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---
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# Style Registry
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## 매 한 줄
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> **"매 SSR streaming 시 CSS-in-JS 의 styles 를 HTML 에 inject 하는 mechanism"**. Next.js 13 App Router 의 `useServerInsertedHTML` hook 도입 — 매 streaming RSC render 도중 styled-components / emotion / @mui 가 generated CSS 를 `<head>` 의 inject. 2026 zero-runtime CSS (Vanilla Extract / Panda) 의 등장 으로 registry 의 less common, but legacy SC/emotion app 의 still required.
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## 매 핵심
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### 매 Why needed
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- **CSS-in-JS = runtime styles**: rules generated when component renders.
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- **SSR**: server renders HTML; client hydrates. Without registry → FOUC (flash of unstyled content) + hydration mismatch.
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- **Streaming SSR**: HTML chunks sent progressively. Styles must inject as components render, not at end.
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- **App Router**: `useServerInsertedHTML` provides hook into Suspense boundary stream.
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### 매 Mechanism
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1. Server: collect styles into sheet during render (per request).
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2. Server: insert `<style>` tags into HTML stream via `useServerInsertedHTML`.
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3. Client: hydrate — runtime takes over, no re-render needed.
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4. Concurrency: per-request sheet (no global state pollution).
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### 매 응용
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1. styled-components in Next.js App Router.
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2. Emotion in Next.js App Router.
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3. @mui v5+ in Next.js.
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## 💻 패턴
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### styled-components Registry
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```typescript
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// app/lib/registry.tsx
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'use client';
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import React, { useState } from 'react';
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import { useServerInsertedHTML } from 'next/navigation';
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import { ServerStyleSheet, StyleSheetManager } from 'styled-components';
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export default function StyledComponentsRegistry({
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children,
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}: {
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children: React.ReactNode;
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}) {
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const [styledComponentsStyleSheet] = useState(() => new ServerStyleSheet());
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useServerInsertedHTML(() => {
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const styles = styledComponentsStyleSheet.getStyleElement();
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styledComponentsStyleSheet.instance.clearTag();
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return <>{styles}</>;
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});
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if (typeof window !== 'undefined') return <>{children}</>;
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return (
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<StyleSheetManager sheet={styledComponentsStyleSheet.instance}>
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{children}
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</StyleSheetManager>
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);
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}
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```
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### Apply in root layout
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```typescript
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// app/layout.tsx
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import StyledComponentsRegistry from './lib/registry';
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export default function RootLayout({
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children,
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}: {
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children: React.ReactNode;
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}) {
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return (
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<html lang="en">
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<body>
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<StyledComponentsRegistry>{children}</StyledComponentsRegistry>
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</body>
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</html>
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);
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}
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```
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### Emotion Registry
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```typescript
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// app/lib/emotion-registry.tsx
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'use client';
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import createCache from '@emotion/cache';
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import { CacheProvider } from '@emotion/react';
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import { useServerInsertedHTML } from 'next/navigation';
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import { useState } from 'react';
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export default function EmotionRegistry({
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children,
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}: {
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children: React.ReactNode;
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}) {
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const [{ cache, flush }] = useState(() => {
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const cache = createCache({ key: 'css' });
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cache.compat = true;
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const prevInsert = cache.insert;
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let inserted: string[] = [];
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cache.insert = (...args) => {
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const serialized = args[1];
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if (cache.inserted[serialized.name] === undefined) {
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inserted.push(serialized.name);
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}
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return prevInsert(...args);
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};
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const flush = () => {
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const prev = inserted;
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inserted = [];
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return prev;
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};
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return { cache, flush };
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});
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useServerInsertedHTML(() => {
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const names = flush();
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if (names.length === 0) return null;
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let styles = '';
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for (const name of names) {
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styles += cache.inserted[name];
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}
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return (
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<style
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data-emotion={`${cache.key} ${names.join(' ')}`}
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dangerouslySetInnerHTML={{ __html: styles }}
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/>
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);
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});
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return <CacheProvider value={cache}>{children}</CacheProvider>;
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}
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```
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### @mui Registry
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```typescript
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// app/lib/mui-registry.tsx
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'use client';
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import { AppRouterCacheProvider } from '@mui/material-nextjs/v15-appRouter';
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import { ThemeProvider } from '@mui/material/styles';
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import { theme } from './theme';
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export default function MuiRegistry({
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children,
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}: {
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children: React.ReactNode;
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}) {
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return (
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<AppRouterCacheProvider options={{ enableCssLayer: true }}>
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<ThemeProvider theme={theme}>{children}</ThemeProvider>
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</AppRouterCacheProvider>
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);
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}
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```
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### Pages Router (legacy) — _document.tsx
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```typescript
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// pages/_document.tsx — Pages Router uses different mechanism
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import Document, { DocumentContext } from 'next/document';
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import { ServerStyleSheet } from 'styled-components';
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export default class MyDocument extends Document {
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static async getInitialProps(ctx: DocumentContext) {
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const sheet = new ServerStyleSheet();
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const originalRenderPage = ctx.renderPage;
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try {
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ctx.renderPage = () =>
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originalRenderPage({
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enhanceApp: App => props =>
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sheet.collectStyles(<App {...props} />),
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});
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const initialProps = await Document.getInitialProps(ctx);
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return {
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...initialProps,
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styles: [initialProps.styles, sheet.getStyleElement()],
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};
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} finally {
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sheet.seal();
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}
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}
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}
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```
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### Verifying SSR works
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```typescript
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// 1. View source (Cmd+U) — should see <style> tags with rules
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// 2. Disable JS in DevTools — page should still be styled
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// 3. Check Network tab — no FOUC during page transition
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// 4. React DevTools — no hydration mismatch warnings
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```
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## 매 결정 기준
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| 상황 | Approach |
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|---|---|
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| Greenfield 2026 Next.js | Tailwind / Vanilla Extract — no registry needed |
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| Existing styled-components migration | Add StyledComponentsRegistry |
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| Emotion-based codebase | EmotionRegistry pattern |
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| @mui v5+ | AppRouterCacheProvider (built-in) |
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| Pages Router legacy | _document.tsx + sheet collection |
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**기본값**: greenfield → zero-runtime CSS (no registry). Existing CSS-in-JS → use library-recommended registry pattern.
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## 🔗 Graph
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- 부모: [[CSS in JS]] · [[SSR]]
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- 변형: [[useServerInsertedHTML]]
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- 응용: [[Styled Components v6]]
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- Adjacent: [[Streaming SSR]] · [[React Server Components]] · [[Hydration]]
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## 🤖 LLM 활용
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**언제**: SSR setup for CSS-in-JS, Next.js App Router migration from Pages, debugging FOUC / hydration mismatch.
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**언제 X**: Tailwind / CSS Modules / Vanilla Extract — these are zero-runtime, no registry needed.
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## ❌ 안티패턴
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- **No registry → FOUC**: styled-components SSR without registry shows unstyled HTML on first paint.
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- **Global sheet (not per-request)**: cross-request style pollution / memory leak.
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- **`'use client'` on registry but rendered at top level**: marks entire tree as client — kills RSC benefit. Wrap deeply.
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- **Forgetting `clearTag()`**: duplicate styles inserted on each chunk.
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- **Mixing registries**: emotion + styled-components → two style systems, double bundle, conflicts.
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## 🧪 검증 / 중복
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- Verified (Next.js docs `app/building-your-application/styling`, styled-components Next.js example, Emotion + Next.js guide).
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- 신뢰도 A.
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## 🕓 Changelog
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| 날짜 | 변경 |
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|---|---|
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| 2026-05-08 | Phase 1 |
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| 2026-05-10 | Manual cleanup — full canonical (registry mechanism + SC/Emotion/MUI patterns + Pages Router fallback) |
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