favicon, icon 和 apple-icon

<link
  rel="icon"
  href="/icon?<generated>"
  type="image/<generated>"
  sizes="<generated>"
/>

<link
  rel="apple-touch-icon"
  href="/apple-icon?<generated>"
  type="image/<generated>"
  sizes="<generated>"
/>

import { ImageResponse } from 'next/og'
 
// Image metadata
export const size = {
  width: 32,
  height: 32,
}
export const contentType = 'image/png'
 
// Image generation
export default function Icon() {
  return new ImageResponse(
    (
      // ImageResponse JSX element
      <div
        style={{
          fontSize: 24,
          background: 'black',
          width: '100%',
          height: '100%',
          display: 'flex',
          alignItems: 'center',
          justifyContent: 'center',
          color: 'white',
        }}
      >
        A
      </div>
    ),
    // ImageResponse options
    {
      // For convenience, we can re-use the exported icons size metadata
      // config to also set the ImageResponse's width and height.
      ...size,
    }
  )
}

export default async function Icon({
  params,
}: {
  params: Promise<{ slug: string }>
}) {
  const { slug } = await params
  // ...
}

export const size = { width: 32, height: 32 }
 
export default function Icon() {}

export const contentType = 'image/png'
 
export default function Icon() {}