feat(deploy): production deployment setup and fixes
- Debian-based api image (bookworm-slim), docker/debian mirrors, prisma binaryTargets for openssl 3.0 - nginx: admin SPA under /admin, TLS via acme.sh (ZeroSSL) + auto-renewal cron, http->https redirect - prisma: add origin_goods.delisted migration, sync missing schema (good_image/tag_font_color/good_tags), fix users.createdAt Timestamptz - api: CORS wildcard reflection, helmet CORP cross-origin, price backfill in persistProductDetail, categoryIcon ancestor fallback, mediaByColor per-color gallery in public goods detail - admin: /admin base path (vite + router) - import-data.mjs: udt_name casting, serial sequence advance fix
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---
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title: Non-Template Content Is Implicitly Default Slot Content
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impact: LOW
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impactDescription: Unexpected content placement when mixing named slots with loose content
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type: gotcha
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tags: [vue3, slots, named-slots, default-slot, implicit-behavior]
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---
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# Non-Template Content Is Implicitly Default Slot Content
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**Impact: LOW** - When using named slots, any top-level content not wrapped in a `<template>` tag is automatically treated as default slot content. This implicit behavior can cause confusion about where content will render.
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## Task Checklist
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- [ ] Understand that loose content goes to the default slot
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- [ ] Use explicit `<template #default>` when clarity matters
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- [ ] Keep slot content organization intentional
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**The Implicit Behavior:**
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```vue
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<script setup>
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import BaseLayout from './BaseLayout.vue'
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</script>
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<template>
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<BaseLayout>
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<template #header>
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<h1>Page Title</h1>
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</template>
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<!-- These are IMPLICITLY in the default slot -->
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<p>First paragraph of main content.</p>
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<p>Second paragraph of main content.</p>
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<template #footer>
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<p>Footer content</p>
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</template>
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</BaseLayout>
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</template>
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```
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The two `<p>` elements are automatically placed in `<slot>` (the default slot) in the child component.
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**Equivalent Explicit Version:**
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```vue
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<template>
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<BaseLayout>
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<template #header>
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<h1>Page Title</h1>
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</template>
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<!-- Explicit default slot -->
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<template #default>
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<p>First paragraph of main content.</p>
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<p>Second paragraph of main content.</p>
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</template>
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<template #footer>
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<p>Footer content</p>
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</template>
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</BaseLayout>
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</template>
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```
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## When Implicit Behavior Causes Confusion
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**Scattered Content:**
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```vue
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<template>
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<BaseLayout>
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<template #header>
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<h1>Title</h1>
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</template>
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<p>Content A</p> <!-- Goes to default slot -->
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<template #sidebar>
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<nav>Navigation</nav>
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</template>
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<p>Content B</p> <!-- Also goes to default slot! -->
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<template #footer>
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<p>Footer</p>
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</template>
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<p>Content C</p> <!-- Also goes to default slot! -->
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</BaseLayout>
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</template>
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```
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All three `<p>` elements end up in the default slot together, which may not be the intended order or grouping.
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**Clearer with Explicit Default:**
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```vue
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<template>
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<BaseLayout>
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<template #header>
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<h1>Title</h1>
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</template>
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<template #default>
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<p>Content A</p>
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<p>Content B</p>
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<p>Content C</p>
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</template>
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<template #sidebar>
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<nav>Navigation</nav>
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</template>
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<template #footer>
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<p>Footer</p>
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</template>
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</BaseLayout>
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</template>
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```
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## Best Practices
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| Scenario | Recommendation |
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|----------|---------------|
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| Only default slot used | Implicit is fine |
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| Mixed named + default slots | Consider explicit `#default` |
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| Complex layouts | Always use explicit templates |
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| Team/shared codebase | Prefer explicit for clarity |
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## The Child Component
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```vue
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<!-- BaseLayout.vue -->
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<template>
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<div class="layout">
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<header>
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<slot name="header"></slot>
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</header>
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<aside>
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<slot name="sidebar"></slot>
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</aside>
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<main>
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<!-- All implicit content ends up here -->
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<slot></slot>
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</main>
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<footer>
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<slot name="footer"></slot>
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</footer>
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</div>
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</template>
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```
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## Reference
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- [Vue.js Slots - Named Slots](https://vuejs.org/guide/components/slots.html#named-slots)
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