Phase7-PerfSEO: 폰트 preload 옵션 및 이미지 loading/decoding UI 연동 TDD/구현 완료

lib/exporter/font.preload.test.ts

@@ -0,0 +1,35 @@
+import { describe, it, expect } from 'vitest'
+import { exportPage, type ExportOptions } from '@/lib/exporter/html'
+import { pageSchema, type Page } from '@/lib/schema/page'
+
+function makePage(fontFamily = 'Inter'): Page {
+  return pageSchema.parse({
+    title: 'Font Preload',
+    locale: 'en',
+    theme: { primaryColor: '#2563eb', fontFamily },
+    sections: [ { type: 'hero', props: { heading: 'Hello', subheading: 'World', imageUrl: 'https://img/h.png' } } ],
+    form: { actionUrl: '', fields: [], spamProtection: { honeypotFieldName: '_hp', minSubmitSeconds: 2 } },
+    seo: { title: 't', description: 'd' },
+  })
+}
+
+describe('폰트 preload 옵션', () => {
+  it('옵션이 true이면 Google Fonts stylesheet preload/link를 head에 포함한다', () => {
+    const page = makePage('Inter')
+    const opts: ExportOptions = { fontPreload: true }
+    const out = exportPage(page, opts)
+    expect(out.html).toContain('rel="preload"')
+    expect(out.html).toContain('as="style"')
+    expect(out.html).toContain('fonts.googleapis.com/css2')
+    expect(out.html).toContain('family=Inter')
+    // onload print hack 포함
+    expect(out.html).toMatch(/rel=\"stylesheet\"[^>]+media=\"print\"[^>]+onload=\"this.media='all'\"/)
+  })
+
+  it('옵션이 false이면 preload/link를 포함하지 않는다', () => {
+    const page = makePage('Inter')
+    const opts: ExportOptions = { fontPreload: false }
+    const out = exportPage(page, opts)
+    expect(out.html).not.toMatch(/fonts.googleapis.com\/css2/)
+  })
+})

lib/exporter/html.ts

@@ -2,7 +2,14 @@ import type { Page, FormField } from '@/lib/schema/page'
 import type { AssetManager } from '@/lib/assets/assetManager'
 
 export type Exported = { html: string; css: string; js: string }
-export type ExportOptions = { assetManager?: AssetManager; fontPreconnect?: boolean; robotsMeta?: string }
+export type ExportOptions = {
+  assetManager?: AssetManager
+  fontPreconnect?: boolean
+  fontPreload?: boolean
+  robotsMeta?: string
+  imageLoading?: 'lazy' | 'eager'
+  imageDecoding?: 'async' | 'sync'
+}
 
 function renderFaq(section: { props: { items: Array<{ q: string; a: string }> } }) {
   const itemsRaw: Array<{ q: string; a: string }> = Array.isArray(section.props.items) ? section.props.items : []
@@ -116,6 +123,8 @@ function renderHero(section: { props: { heading: string; subheading?: string; im
   const am = opts?.assetManager
   const imageUrlRaw: string = section.props.imageUrl
   const imageUrl = am ? am.rewriteUrl(imageUrlRaw) : imageUrlRaw
+  const loading = opts?.imageLoading ?? 'lazy'
+  const decoding = opts?.imageDecoding ?? 'async'
   return `
     <section class="hero" aria-labelledby="hero-heading">
       <div class="container">
@@ -124,7 +133,7 @@ function renderHero(section: { props: { heading: string; subheading?: string; im
           ${subheading.length > 0 ? `<p>${escapeHtml(subheading)}</p>` : ''}
         </div>
         <div class="media">
-          <img src="${escapeHtml(imageUrl)}" alt="${escapeHtml(heading)}" loading="lazy" decoding="async" width="1200" height="675" />
+          <img src="${escapeHtml(imageUrl)}" alt="${escapeHtml(heading)}" loading="${escapeHtml(loading)}" decoding="${escapeHtml(decoding)}" width="1200" height="675" />
         </div>
       </div>
     </section>
@@ -252,12 +261,18 @@ function buildHead(page: Page, opts?: ExportOptions) {
   const custom = page.analytics?.customHeadHtml || ''
   const preconnect = opts?.fontPreconnect !== false
   const robotsMeta = (opts?.robotsMeta && opts.robotsMeta.trim().length > 0) ? `<meta name="robots" content="${escapeHtml(opts!.robotsMeta!)}" />` : ''
+  const fontPreload = opts?.fontPreload === true
+  const rawFamily = (page.theme?.fontFamily || '').trim()
+  const fontHref = rawFamily.length > 0 ? `https://fonts.googleapis.com/css2?family=${encodeURIComponent(rawFamily).replace(/%20/g, '+')}&display=swap` : ''
   return `
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <link rel="canonical" href="/" />
     ${preconnect ? '<link rel="preconnect" href="https://fonts.googleapis.com" />' : ''}
     ${preconnect ? '<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />' : ''}
+    ${fontPreload && fontHref ? `<link rel="preload" as="style" href="${fontHref}" />` : ''}
+    ${fontPreload && fontHref ? `<link rel="stylesheet" href="${fontHref}" media="print" onload="this.media='all'" />` : ''}
+    ${fontPreload && fontHref ? `<noscript><link rel="stylesheet" href="${fontHref}" /></noscript>` : ''}
     <link rel="manifest" href="/site.webmanifest" />
     <meta name="theme-color" content="${escapeHtml(page.theme.primaryColor)}" />
     ${robotsMeta}

lib/exporter/image.loading.toggle.test.ts

@@ -0,0 +1,31 @@
+import { describe, it, expect } from 'vitest'
+import { exportPage, type ExportOptions } from '@/lib/exporter/html'
+import { pageSchema, type Page } from '@/lib/schema/page'
+
+function makePage(): Page {
+  return pageSchema.parse({
+    title: 'Img Perf',
+    locale: 'en',
+    theme: { primaryColor: '#2563eb', fontFamily: 'Inter' },
+    sections: [ { type: 'hero', props: { heading: 'Hello', subheading: 'World', imageUrl: 'https://img/h.png' } } ],
+    form: { actionUrl: '', fields: [], spamProtection: { honeypotFieldName: '_hp', minSubmitSeconds: 2 } },
+    seo: { title: 't', description: 'd' },
+  })
+}
+
+describe('이미지 loading/decoding 토글', () => {
+  it('기본은 loading="lazy", decoding="async"', () => {
+    const page = makePage()
+    const out = exportPage(page)
+    expect(out.html).toContain('loading="lazy"')
+    expect(out.html).toContain('decoding="async"')
+  })
+
+  it('옵션으로 eager/sync로 바꿀 수 있다', () => {
+    const page = makePage()
+    const opts: ExportOptions = { imageLoading: 'eager', imageDecoding: 'sync' }
+    const out = exportPage(page, opts)
+    expect(out.html).toContain('loading="eager"')
+    expect(out.html).toContain('decoding="sync"')
+  })
+})