123 lines
3.9 KiB
TypeScript
123 lines
3.9 KiB
TypeScript
import type { I18nConfig, LocalizedSlugs } from '../i18n/index.js'
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import type { TitleOrder } from './composeTitle.js'
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import type { SeoMeta } from './types.js'
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import { buildLocalizedPath } from '../i18n/index.js'
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import { composeTitle } from './composeTitle.js'
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import { buildHreflangAlternates } from './hreflang.js'
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/**
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* Subset of Next.js `Metadata` this helper produces. Kept local so the plugin
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* doesn't depend on `next` types; the shape is assignable to Next's Metadata.
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*/
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export type PageMetadata = {
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alternates?: {
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canonical?: string
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languages?: Record<string, string>
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}
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description?: string
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openGraph?: {
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description?: string
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images?: { url: string }[]
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locale?: string
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title: string
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}
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title: string
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}
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type BuildMetadataArgs = {
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/** Absolute site origin, e.g. 'https://example.com'. */
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baseUrl?: string
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config: I18nConfig
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/** Home slug that collapses to the locale root. Defaults to 'home'. */
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homeSlug?: string
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/** Resolved OG image URL (page image or site defaultShareImage). */
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imageUrl?: null | string
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/** Current locale being rendered. */
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locale: string
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/** SEO meta from the document (plugin-seo group). */
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meta?: null | SeoMeta
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/** Page title or site name first. Defaults to 'page-first'. */
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order?: TitleOrder
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/**
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* Localized segment the document lives under (an archive page's slugs).
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* Feeds both canonical and hreflang, so /pl/artykuly/moj-post and
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* /en/articles/my-post point at each other correctly.
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*/
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prefix?: LocalizedSlugs
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/**
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* Query string appended to canonical and every hreflang, e.g. '?page=2'.
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*
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* A paginated listing must be canonical to itself — pointing page 2 at page 1
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* tells Google the entries on it don't exist. Alternates carry the same page,
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* since /pl/artykuly?page=2 corresponds to /en/articles?page=2.
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*/
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query?: string
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/** Separator between page title and site name. Defaults to ' | '. */
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separator?: string
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/** Site name for title composition and OG. */
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siteName?: null | string
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/** slug per locale for this document — drives canonical + hreflang. */
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slugs: LocalizedSlugs
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}
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/**
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* Assembles a Next.js-compatible Metadata object from document SEO fields and
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* site-level data. Locale-aware: canonical points at the current locale's
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* path, and hreflang alternates cover every locale the document exists in.
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*
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* Designed for use inside Next.js `generateMetadata`. The caller resolves the
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* pieces (meta group, site name, image URL, localized slugs) and passes them
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* in — the plugin composes, it doesn't fetch.
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*/
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export function buildMetadata({
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baseUrl,
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config,
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homeSlug = 'home',
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imageUrl,
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locale,
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meta,
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order,
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prefix,
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query,
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separator,
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siteName,
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slugs,
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}: BuildMetadataArgs): PageMetadata {
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// titleOverride wins outright: an editor who filled it in wants that exact
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// string in the tab, not a composition.
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const override = meta?.titleOverride?.trim()
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const title = override || composeTitle({ order, pageTitle: meta?.title, separator, siteName })
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const description = meta?.description?.trim() || undefined
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const origin = baseUrl?.replace(/\/$/, '') ?? ''
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const suffix = query ?? ''
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const currentPath = buildLocalizedPath({ config, homeSlug, locale, prefix, slugs })
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const canonical = currentPath ? `${origin}${currentPath}${suffix}` : undefined
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const languages = buildHreflangAlternates({ baseUrl, config, homeSlug, prefix, slugs })
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if (suffix) {
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for (const code of Object.keys(languages)) {
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languages[code] = `${languages[code]}${suffix}`
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}
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}
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const images = imageUrl ? [{ url: imageUrl }] : undefined
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return {
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title,
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...(description && { description }),
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alternates: {
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...(canonical && { canonical }),
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...(Object.keys(languages).length > 0 && { languages }),
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},
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openGraph: {
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title,
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...(description && { description }),
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...(images && { images }),
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locale,
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},
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}
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}
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