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import type { ResolvedMetadata } from '../types/metadata-interface'
import type { AlternateLinkDescriptor } from '../types/alternative-urls-types'
import React from 'react'
import { MetaFilter } from './meta'
function AlternateLink({
descriptor,
...props
}: {
descriptor: AlternateLinkDescriptor
} & React.LinkHTMLAttributes<HTMLLinkElement>) {
if (!descriptor.url) return null
return (
<link
{...props}
{...(descriptor.title && { title: descriptor.title })}
href={descriptor.url.toString()}
/>
)
}
export function AlternatesMetadata({
alternates,
}: {
alternates: ResolvedMetadata['alternates']
}) {
if (!alternates) return null
const { canonical, languages, media, types } = alternates
return MetaFilter([
canonical
? AlternateLink({ rel: 'canonical', descriptor: canonical })
: null,
languages
? Object.entries(languages).flatMap(([locale, descriptors]) =>
descriptors?.map((descriptor) =>
AlternateLink({ rel: 'alternate', hrefLang: locale, descriptor })
)
)
: null,
media
? Object.entries(media).flatMap(([mediaName, descriptors]) =>
descriptors?.map((descriptor) =>
AlternateLink({ rel: 'alternate', media: mediaName, descriptor })
)
)
: null,
types
? Object.entries(types).flatMap(([type, descriptors]) =>
descriptors?.map((descriptor) =>
AlternateLink({ rel: 'alternate', type, descriptor })
)
)
: null,
])
}
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