feat: add OG image for compare pages

app/components/OgImage/Compare.vue

@@ -0,0 +1,181 @@
+<script setup lang="ts">
+import { computed, ref } from 'vue'
+import { encodePackageName } from '#shared/utils/npm'
+
+const props = withDefaults(
+  defineProps<{
+    packages?: string | string[]
+    emptyDescription?: string
+    primaryColor?: string
+  }>(),
+  {
+    packages: () => [],
+    emptyDescription: 'Compare npm packages side-by-side',
+    primaryColor: '#60a5fa',
+  },
+)
+
+const ACCENT_COLORS = ['#60a5fa', '#f472b6', '#34d399', '#fbbf24']
+
+const displayPackages = computed(() => {
+  const raw = props.packages
+  const list =
+    typeof raw === 'string'
+      ? raw
+          .split(',')
+          .map(p => p.trim())
+          .filter(Boolean)
+      : raw
+  return list.slice(0, 4)
+})
+
+interface PkgStats {
+  name: string
+  downloads: number
+  version: string
+  color: string
+}
+
+const stats = ref<PkgStats[]>([])
+
+const FETCH_TIMEOUT_MS = 2500
+
+try {
+  const results = await Promise.all(
+    displayPackages.value.map(async (name, index) => {
+      const encoded = encodePackageName(name)
+      const [dlData, pkgData] = await Promise.all([
+        $fetch<{ downloads: number }>(
+          `https://api.npmjs.org/downloads/point/last-week/${encoded}`,
+          { timeout: FETCH_TIMEOUT_MS },
+        ).catch(() => null),
+        $fetch<{ 'dist-tags'?: { latest?: string } }>(`https://registry.npmjs.org/${encoded}`, {
+          timeout: FETCH_TIMEOUT_MS,
+          headers: { Accept: 'application/vnd.npm.install-v1+json' },
+        }).catch(() => null),
+      ])
+      return {
+        name,
+        downloads: dlData?.downloads ?? 0,
+        version: pkgData?.['dist-tags']?.latest ?? '',
+        color: ACCENT_COLORS[index % ACCENT_COLORS.length]!,
+      }
+    }),
+  )
+  stats.value = results
+} catch {
+  stats.value = displayPackages.value.map((name, index) => ({
+    name,
+    downloads: 0,
+    version: '',
+    color: ACCENT_COLORS[index % ACCENT_COLORS.length]!,
+  }))
+}
+
+const maxDownloads = computed(() => Math.max(...stats.value.map(s => s.downloads), 1))
+
+function formatDownloads(n: number): string {
+  if (n === 0) return '—'
+  return Intl.NumberFormat('en', {
+    notation: 'compact',
+    maximumFractionDigits: 1,
+  }).format(n)
+}
+
+// Bar width as percentage string (max 100%)
+function barPct(downloads: number): string {
+  const pct = (downloads / maxDownloads.value) * 100
+  return `${Math.max(pct, 5)}%`
+}
+</script>
+
+<template>
+  <div
+    class="h-full w-full flex flex-col justify-center px-20 bg-[#050505] text-[#fafafa] relative overflow-hidden"
+    style="font-family: 'Geist Mono', sans-serif"
+  >
+    <div class="relative z-10 flex flex-col gap-5">
+      <!-- Icon + title row -->
+      <div class="flex items-start gap-4">
+        <div
+          class="flex items-center justify-center w-14 h-14 p-3 rounded-xl shadow-lg bg-gradient-to-tr from-[#3b82f6]"
+          :style="{ backgroundColor: primaryColor }"
+        >
+          <svg
+            width="32"
+            height="32"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="white"
+            stroke-width="2.5"
+            stroke-linecap="round"
+            stroke-linejoin="round"
+          >
+            <circle cx="18" cy="18" r="3" />
+            <circle cx="6" cy="6" r="3" />
+            <path d="M13 6h3a2 2 0 0 1 2 2v7" />
+            <path d="M11 18H8a2 2 0 0 1-2-2V9" />
+          </svg>
+        </div>
+
+        <h1 class="text-7xl font-bold tracking-tight">
+          <span
+            class="opacity-80 tracking-[-0.1em]"
+            :style="{ color: primaryColor }"
+            style="margin-right: 0.25rem"
+            >./</span
+          >compare
+        </h1>
+      </div>
+
+      <!-- Empty state -->
+      <div
+        v-if="stats.length === 0"
+        class="text-4xl text-[#a3a3a3]"
+        style="font-family: 'Geist', sans-serif"
+      >
+        {{ emptyDescription }}
+      </div>
+
+      <!-- Bar chart rows -->
+      <div v-else class="flex flex-col gap-2">
+        <div v-for="pkg in stats" :key="pkg.name" class="flex flex-col gap-1">
+          <!-- Label row: name + downloads + version -->
+          <div class="flex items-center gap-3" style="font-family: 'Geist', sans-serif">
+            <span class="text-2xl font-semibold tracking-tight" :style="{ color: pkg.color }">
+              {{ pkg.name }}
+            </span>
+            <span class="text-3xl font-bold text-[#fafafa]">
+              {{ formatDownloads(pkg.downloads) }}/wk
+            </span>
+            <span
+              v-if="pkg.version"
+              class="text-lg px-2 py-0.5 rounded-md border"
+              :style="{
+                color: pkg.color,
+                backgroundColor: pkg.color + '10',
+                borderColor: pkg.color + '30',
+              }"
+            >
+              {{ pkg.version }}
+            </span>
+          </div>
+
+          <!-- Bar -->
+          <div
+            class="h-6 rounded-md"
+            :style="{
+              width: barPct(pkg.downloads),
+              background: `linear-gradient(90deg, ${pkg.color}50, ${pkg.color}20)`,
+            }"
+          />
+        </div>
+      </div>
+    </div>
+
+    <div
+      class="absolute -top-32 -inset-ie-32 w-[550px] h-[550px] rounded-full blur-3xl"
+      :style="{ backgroundColor: primaryColor + '10' }"
+    />
+  </div>
+</template>

app/pages/compare.vue

@@ -135,6 +135,11 @@ function exportComparisonDataAsMarkdown() {
   copy(markdown)
 }
 
+defineOgImageComponent('Compare', {
+  packages: () => packages.value,
+  emptyDescription: () => $t('compare.packages.meta_description_empty'),
+})
+
 useSeoMeta({
   title: () =>
     packages.value.length > 0

test/unit/a11y-component-coverage.spec.ts

@@ -26,6 +26,7 @@ const SKIPPED_COMPONENTS: Record<string, string> = {
   'OgImage/BlogPost.vue': 'OG Image component - server-rendered image, not interactive UI',
   'OgImage/Default.vue': 'OG Image component - server-rendered image, not interactive UI',
   'OgImage/Package.vue': 'OG Image component - server-rendered image, not interactive UI',
+  'OgImage/Compare.vue': 'OG Image component - server-rendered image, not interactive UI',
 
   // Client-only components with complex dependencies
   'Header/AuthModal.client.vue': 'Complex auth modal with navigation - requires full app context',