@tanstack/react-router/dist/cjs/HeadContent.cjs.map

Modern and scalable routing for React applications

{"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    for (let i = routeMeta.length - 1; i >= 0; i--) {\n      const metas = routeMeta[i]!\n      for (let j = metas.length - 1; j >= 0; j--) {\n        const m = metas[j]\n        if (!m) continue\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              continue\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      const constructed = 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        })) satisfies Array<RouterManagedTag>\n\n      const manifest = router.ssr?.manifest\n\n      // These are the assets extracted from the ViteManifest\n      // using the `startManifestPlugin`\n      const assets = state.matches\n        .map((match) => manifest?.routes[match.routeId]?.assets ?? [])\n        .filter(Boolean)\n        .flat(1)\n        .filter((asset) => asset.tag === 'link')\n        .map(\n          (asset) =>\n            ({\n              tag: 'link',\n              attrs: {\n                ...asset.attrs,\n                suppressHydrationWarning: true,\n              },\n            }) satisfies RouterManagedTag,\n        )\n\n      return [...constructed, ...assets]\n    },\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 styles = useRouterState({\n    select: (state) =>\n      (\n        state.matches\n          .map((match) => match.styles!)\n          .flat(1)\n          .filter(Boolean) as Array<RouterManagedTag>\n      ).map(({ children, ...attrs }) => ({\n        tag: 'style',\n        attrs,\n        children,\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      ...styles,\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  const router = useRouter()\n  const nonce = router.options.ssr?.nonce\n  return tags.map((tag) => (\n    <Asset {...tag} key={`tsr-meta-${JSON.stringify(tag)}`} nonce={nonce} />\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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