@tanstack/react-router
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Modern and scalable routing for React applications
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{"version":3,"file":"HeadContent.cjs","sources":["../../src/HeadContent.tsx"],"sourcesContent":["import * as React from 'react'\nimport { Asset } from './Asset'\nimport { useRouter } from './useRouter'\nimport { useRouterState } from './useRouterState'\nimport type { RouterManagedTag } from '@tanstack/router-core'\n\nexport const useTags = () => {\n const router = useRouter()\n\n const routeMeta = useRouterState({\n select: (state) => {\n return state.matches.map((match) => match.meta!).filter(Boolean)\n },\n })\n\n const meta: Array<RouterManagedTag> = React.useMemo(() => {\n const resultMeta: Array<RouterManagedTag> = []\n const metaByAttribute: Record<string, true> = {}\n let title: RouterManagedTag | undefined\n ;[...routeMeta].reverse().forEach((metas) => {\n ;[...metas].reverse().forEach((m) => {\n if (!m) return\n\n if (m.title) {\n if (!title) {\n title = {\n tag: 'title',\n children: m.title,\n }\n }\n } else {\n const attribute = m.name ?? m.property\n if (attribute) {\n if (metaByAttribute[attribute]) {\n return\n } else {\n metaByAttribute[attribute] = true\n }\n }\n\n resultMeta.push({\n tag: 'meta',\n attrs: {\n ...m,\n },\n })\n }\n })\n })\n\n if (title) {\n resultMeta.push(title)\n }\n\n resultMeta.reverse()\n\n return resultMeta\n }, [routeMeta])\n\n const links = useRouterState({\n select: (state) =>\n state.matches\n .map((match) => match.links!)\n .filter(Boolean)\n .flat(1)\n .map((link) => ({\n tag: 'link',\n attrs: {\n ...link,\n },\n })) as Array<RouterManagedTag>,\n structuralSharing: true as any,\n })\n\n const preloadMeta = useRouterState({\n select: (state) => {\n const preloadMeta: Array<RouterManagedTag> = []\n\n state.matches\n .map((match) => router.looseRoutesById[match.routeId]!)\n .forEach((route) =>\n router.ssr?.manifest?.routes[route.id]?.preloads\n ?.filter(Boolean)\n .forEach((preload) => {\n preloadMeta.push({\n tag: 'link',\n attrs: {\n rel: 'modulepreload',\n href: preload,\n },\n })\n }),\n )\n\n return preloadMeta\n },\n structuralSharing: true as any,\n })\n\n const headScripts = useRouterState({\n select: (state) =>\n (\n state.matches\n .map((match) => match.headScripts!)\n .flat(1)\n .filter(Boolean) as Array<RouterManagedTag>\n ).map(({ children, ...script }) => ({\n tag: 'script',\n attrs: {\n ...script,\n },\n children,\n })),\n structuralSharing: true as any,\n })\n\n return uniqBy(\n [\n ...meta,\n ...preloadMeta,\n ...links,\n ...headScripts,\n ] as Array<RouterManagedTag>,\n (d) => {\n return JSON.stringify(d)\n },\n )\n}\n\n/**\n * @description The `HeadContent` component is used to render meta tags, links, and scripts for the current route.\n * It should be rendered in the `<head>` of your document.\n */\nexport function HeadContent() {\n const tags = useTags()\n return tags.map((tag) => (\n <Asset {...tag} key={`tsr-meta-${JSON.stringify(tag)}`} />\n ))\n}\n\nfunction uniqBy<T>(arr: Array<T>, fn: (item: T) => string) {\n const seen = new Set<string>()\n return arr.filter((item) => {\n const key = fn(item)\n if (seen.has(key)) {\n return false\n }\n seen.add(key)\n return true\n 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