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Jason Woltje f6bcc86881 feat: Add 5 curated skills for Mosaic Stack

New skills:
- next-best-practices: Next.js 15+ RSC, async patterns, self-hosting (vercel-labs)
- better-auth-best-practices: Official Better-Auth with Drizzle adapter (better-auth)
- verification-before-completion: Evidence-based completion claims (obra/superpowers)
- shadcn-ui: Component patterns with Tailwind v4 adaptation note (developer-kit)
- writing-skills: TDD methodology for skill authoring (obra/superpowers)

README reorganized by category with Mosaic Stack alignment section.
Total: 9 skills (4 existing + 5 new).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-16 16:17:40 -06:00

3.2 KiB

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Scripts

Loading third-party scripts in Next.js.

Use next/script

Always use next/script instead of native <script> tags for better performance.

// Bad: Native script tag
<script src="https://example.com/script.js"></script>

// Good: Next.js Script component
import Script from 'next/script'

<Script src="https://example.com/script.js" />

Inline Scripts Need ID

Inline scripts require an id attribute for Next.js to track them.

// Bad: Missing id
<Script dangerouslySetInnerHTML={{ __html: 'console.log("hi")' }} />

// Good: Has id
<Script id="my-script" dangerouslySetInnerHTML={{ __html: 'console.log("hi")' }} />

// Good: Inline with id
<Script id="show-banner">
  {`document.getElementById('banner').classList.remove('hidden')`}
</Script>

Don't Put Script in Head

next/script should not be placed inside next/head. It handles its own positioning.

// Bad: Script inside Head
import Head from 'next/head'
import Script from 'next/script'

<Head>
  <Script src="/analytics.js" />
</Head>

// Good: Script outside Head
<Head>
  <title>Page</title>
</Head>
<Script src="/analytics.js" />

Loading Strategies

// afterInteractive (default) - Load after page is interactive
<Script src="/analytics.js" strategy="afterInteractive" />

// lazyOnload - Load during idle time
<Script src="/widget.js" strategy="lazyOnload" />

// beforeInteractive - Load before page is interactive (use sparingly)
// Only works in app/layout.tsx or pages/_document.js
<Script src="/critical.js" strategy="beforeInteractive" />

// worker - Load in web worker (experimental)
<Script src="/heavy.js" strategy="worker" />

Google Analytics

Use @next/third-parties instead of inline GA scripts.

// Bad: Inline GA script
<Script src="https://www.googletagmanager.com/gtag/js?id=G-XXXXX" />
<Script id="ga-init">
  {`window.dataLayer = window.dataLayer || [];
    function gtag(){dataLayer.push(arguments);}
    gtag('js', new Date());
    gtag('config', 'G-XXXXX');`}
</Script>

// Good: Next.js component
import { GoogleAnalytics } from '@next/third-parties/google'

export default function Layout({ children }) {
  return (
    <html>
      <body>{children}</body>
      <GoogleAnalytics gaId="G-XXXXX" />
    </html>
  )
}

Google Tag Manager

import { GoogleTagManager } from '@next/third-parties/google'

export default function Layout({ children }) {
  return (
    <html>
      <GoogleTagManager gtmId="GTM-XXXXX" />
      <body>{children}</body>
    </html>
  )
}

Other Third-Party Scripts

// YouTube embed
import { YouTubeEmbed } from '@next/third-parties/google'

<YouTubeEmbed videoid="dQw4w9WgXcQ" />

// Google Maps
import { GoogleMapsEmbed } from '@next/third-parties/google'

<GoogleMapsEmbed
  apiKey="YOUR_API_KEY"
  mode="place"
  q="Brooklyn+Bridge,New+York,NY"
/>

Quick Reference

Pattern	Issue	Fix
`<script src="...">`	No optimization	Use `next/script`
`<Script>` without id	Can't track inline scripts	Add `id` attribute
`<Script>` inside `<Head>`	Wrong placement	Move outside Head
Inline GA/GTM scripts	No optimization	Use `@next/third-parties`
`strategy="beforeInteractive"` outside layout	Won't work	Only use in root layout

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