chore(brain): ASTRA 성장 자산 동기화 — 기능 인벤토리·growth(약점프로필/학습큐)·일화기억·장기기억·회의록 원문

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+---
+id: wiki-2026-0508-island-architecture
+title: Island Architecture
+category: 10_Wiki/Topics
+status: verified
+canonical_id: self
+aliases: [Islands Architecture, Partial Hydration, Selective Hydration]
+duplicate_of: none
+source_trust_level: A
+confidence_score: 0.9
+verification_status: applied
+tags: [architecture, web, frontend, hydration, performance]
+raw_sources: []
+last_reinforced: 2026-05-10
+github_commit: pending
+tech_stack:
+  language: typescript
+  framework: astro-fresh
+---
+
+# Island Architecture
+
+## 매 한 줄
+> **"매 mostly-static HTML 의 sea 의 isolated interactive 'island' 의 selective hydration 의 통한 ship-less-JS"**. 매 Katie Sylor-Miller (2019) 의 term, Jason Miller (2020) 의 popularization, 매 Astro (2021) / Fresh (Deno) / Marko / Qwik 의 implementation — 매 SPA-everything 의 over-hydration 의 backlash.
+
+## 매 핵심
+
+### 매 핵심 idea
+- Server 의 HTML 의 render (default).
+- 매 interactive component (island) 의 isolated hydration boundary.
+- 매 island 의 own JS bundle, 매 nothing else 의 ship.
+- 매 island 간 의 share state 의 X (or framework-specific signal).
+
+### 매 Hydration directive (Astro)
+- `client:load` — 매 page load 의 즉시.
+- `client:idle` — `requestIdleCallback`.
+- `client:visible` — IntersectionObserver.
+- `client:media="(min-width: 768px)"` — viewport conditional.
+- `client:only="react"` — server render skip, client only.
+
+### 매 응용
+1. Content sites (blog, docs, marketing).
+2. E-commerce (정적 product page + interactive cart island).
+3. News / publishing (정적 article + comment island).
+
+## 💻 패턴
+
+### Astro — React Island
+```astro
+---
+// src/pages/index.astro
+import Counter from '../components/Counter.tsx';
+import Newsletter from '../components/Newsletter.tsx';
+const posts = await fetch(import.meta.env.CMS_URL).then(r => r.json());
+---
+<html>
+  <body>
+    <h1>Blog</h1>
+    <ul>{posts.map(p => <li>{p.title}</li>)}</ul>
+
+    <Counter client:visible />               <!-- island, lazy hydrate -->
+    <Newsletter client:idle />               <!-- island, idle hydrate -->
+  </body>
+</html>
+```
+
+### Astro — Mixed Frameworks (one page, multiple)
+```astro
+---
+import VueWidget from './Widget.vue';
+import SvelteChart from './Chart.svelte';
+import SolidSearch from './Search.tsx';
+---
+<VueWidget client:load />
+<SvelteChart client:visible />
+<SolidSearch client:idle />
+```
+
+### Fresh (Deno) — Island
+```tsx
+// islands/Counter.tsx
+import { useSignal } from '@preact/signals';
+export default function Counter() {
+  const count = useSignal(0);
+  return <button onClick={() => count.value++}>{count.value}</button>;
+}
+
+// routes/index.tsx
+import Counter from '../islands/Counter.tsx';
+export default function Home() {
+  return <main><h1>Home</h1><Counter /></main>;
+}
+```
+
+### Qwik — Resumability (zero hydration)
+```tsx
+// src/routes/index.tsx
+import { component$, useSignal } from '@builder.io/qwik';
+export default component$(() => {
+  const count = useSignal(0);
+  return (
+    <button onClick$={() => count.value++}>
+      Clicks: {count.value}
+    </button>
+  );
+});
+// 매 click 의 시 의 only 의 download — true progressive
+```
+
+### Marko 5 — Streaming Islands
+```marko
+<!doctype html>
+<html>
+  <body>
+    <h1>Products</h1>
+    <await(productPromise)>
+      <@then|products|>
+        <for|p| of=products>
+          <product-card p=p/>
+        </for>
+      </@then>
+    </await>
+  </body>
+</html>
+```
+
+### Performance Budget Check
+```yaml
+# .lighthouserc.yml
+ci:
+  collect: { url: ['https://example.com/'] }
+  assert:
+    assertions:
+      total-byte-weight: ['error', { maxNumericValue: 200000 }]
+      total-blocking-time: ['error', { maxNumericValue: 200 }]
+      interaction-to-next-paint: ['error', { maxNumericValue: 200 }]
+```
+
+## 매 결정 기준
+| 상황 | Approach |
+|---|---|
+| Content-heavy, low interactivity | Astro (default) |
+| Per-route framework choice | Astro multi-framework |
+| Edge / Deno preference | Fresh |
+| App-shell SPA feel | Next.js / Remix (RSC + Suspense) |
+| Zero-hydration target | Qwik |
+
+**기본값**: 매 marketing/blog/docs — Astro + island per interactive component. 매 dashboard-y app — Next.js RSC.
+
+## 🔗 Graph
+- 부모: [[Web-Rendering-Strategies]] · [[프론트엔드_및_UIUX_표준|Frontend-Architecture]]
+- 변형: [[Partial-Hydration]] · [[Resumability]] · [[Streaming-SSR]]
+- 응용: [[Astro]] · [[Qwik]]
+- Adjacent: [[React-Server-Components]] · [[Incremental-Static-Regeneration-ISR]] · [[MPA]]
+
+## 🤖 LLM 활용
+**언제**: page 의 island boundary 의 propose, hydration directive 의 select, JS bundle 의 reduction 의 suggest.
+**언제 X**: 매 framework 의 final choice (team skill, ecosystem fit 의 human decision).
+
+## ❌ 안티패턴
+- **Island sprawl**: 매 component 의 `client:load` → SPA equivalent.
+- **Cross-island state**: 매 island 의 shared store 의 hack — 매 framework boundary 의 violation.
+- **Server-only data 의 island leak**: secret/PII 의 client island prop 의 pass.
+- **`client:only` overuse**: server render 의 skip → SEO 의 hurt + LCP 의 regress.
+- **Wrong tool**: 매 highly interactive app (Figma-like) 의 Astro 의 force-fit.
+
+## 🧪 검증 / 중복
+- Verified (Jason Miller "Islands Architecture" 2020, Astro 4 docs, Fresh docs, web.dev).
+- 신뢰도 A.
+
+## 🕓 Changelog
+| 날짜 | 변경 |
+|---|---|
+| 2026-05-08 | Phase 1 |
+| 2026-05-10 | Manual cleanup — island architecture (Astro/Fresh/Qwik) 의 full content |