// app/routes/about.tsx
import type { Route } from "./+types/about";

export function meta({}: Route.MetaArgs) {
  return [
    { title: "About Us" },
    { name: "description", content: "Learn about our company" },
  ];
}

export default function About() {
  return <h1>About</h1>;
}

<title>About Us</title>
<meta name="description" content="Learn about our company" />

// app/routes/blog.$slug.tsx
import type { Route } from "./+types/blog.$slug";

export async function loader({ params }: Route.LoaderArgs) {
  const post = await getPost(params.slug);
  if (!post) {
    throw new Response("Not Found", { status: 404 });
  }
  return { post };
}

export function meta({ data }: Route.MetaArgs) {
  if (!data?.post) {
    return [{ title: "Post Not Found" }];
  }

  return [
    { title: data.post.title },
    { name: "description", content: data.post.excerpt },
    { name: "author", content: data.post.author },
    { property: "og:title", content: data.post.title },
    { property: "og:description", content: data.post.excerpt },
    { property: "og:image", content: data.post.image },
    { property: "og:type", content: "article" },
    { name: "twitter:card", content: "summary_large_image" },
    { name: "twitter:title", content: data.post.title },
    { name: "twitter:description", content: data.post.excerpt },
    { name: "twitter:image", content: data.post.image },
  ];
}

import type { Route } from "./+types/blog.$slug";

export function meta({ data, matches }: Route.MetaArgs) {
  // Find parent route meta
  const parentMeta = matches
    .flatMap((match) => match.meta ?? [])
    .filter((meta) => !('title' in meta));

  return [
    ...parentMeta,
    { title: `${data.post.title} | My Blog` },
    { name: "description", content: data.post.excerpt },
  ];
}

export function meta({}: Route.MetaArgs) {
  return [
    // Title
    { title: "My Page" },

    // Meta tags
    { name: "description", content: "Page description" },
    { name: "keywords", content: "react, router" },

    // Open Graph
    { property: "og:title", content: "My Page" },
    { property: "og:type", content: "website" },
    { property: "og:url", content: "https://example.com" },
    { property: "og:image", content: "https://example.com/image.jpg" },

    // Twitter Card
    { name: "twitter:card", content: "summary_large_image" },
    { name: "twitter:site", content: "@username" },

    // Additional tags with tagName
    { tagName: "link", rel: "canonical", href: "https://example.com" },
    {
      tagName: "script",
      type: "application/ld+json",
      children: JSON.stringify({
        "@context": "https://schema.org",
        "@type": "Organization",
        name: "My Company",
      }),
    },
  ];
}

import type { Route } from "./+types/product.$id";

export function meta({ data }: Route.MetaArgs) {
  const { product } = data;

  const structuredData = {
    "@context": "https://schema.org",
    "@type": "Product",
    name: product.name,
    image: product.image,
    description: product.description,
    offers: {
      "@type": "Offer",
      url: `https://example.com/products/${product.id}`,
      priceCurrency: "USD",
      price: product.price,
      availability: product.inStock
        ? "https://schema.org/InStock"
        : "https://schema.org/OutOfStock",
    },
  };

  return [
    { title: product.name },
    { name: "description", content: product.description },
    {
      tagName: "script",
      type: "application/ld+json",
      children: JSON.stringify(structuredData),
    },
  ];
}

// app/root.tsx
import type { Route } from "./+types/root";

export function meta({}: Route.MetaArgs) {
  return [
    { charset: "utf-8" },
    { name: "viewport", content: "width=device-width, initial-scale=1" },
    { title: "My App" },
    { name: "description", content: "Default description" },
    { property: "og:site_name", content: "My App" },
  ];
}

import type { Route } from "./+types/users.$userId";

export async function loader({ params }: Route.LoaderArgs) {
  return { user: await getUser(params.userId) };
}

export function meta({ data, params }: Route.MetaArgs) {
  if (!data?.user) {
    return [{ title: "User Not Found" }];
  }

  return [
    { title: `${data.user.name}'s Profile` },
    { name: "description", content: data.user.bio },
  ];
}

import type { Route } from "./+types/products.$id";

export function meta({ data }: Route.MetaArgs) {
  const { product } = data;
  const url = `https://example.com/products/${product.id}`;

  return [
    // Page title (50-60 characters)
    { title: `${product.name} - Buy Online | Store Name` },

    // Meta description (150-160 characters)
    {
      name: "description",
      content: `${product.description.substring(0, 155)}...`,
    },

    // Canonical URL
    { tagName: "link", rel: "canonical", href: url },

    // Open Graph
    { property: "og:title", content: product.name },
    { property: "og:description", content: product.description },
    { property: "og:image", content: product.image },
    { property: "og:url", content: url },
    { property: "og:type", content: "product" },

    // Twitter Card
    { name: "twitter:card", content: "summary_large_image" },
    { name: "twitter:title", content: product.name },
    { name: "twitter:description", content: product.description },
    { name: "twitter:image", content: product.image },

    // Additional meta tags
    { name: "robots", content: "index, follow" },
    { name: "googlebot", content: "index, follow" },
  ];
}

import { isRouteErrorResponse } from "react-router";
import type { Route } from "./+types/blog.$slug";

export function meta({ error }: Route.MetaArgs) {
  if (isRouteErrorResponse(error)) {
    if (error.status === 404) {
      return [
        { title: "404 - Post Not Found" },
        { name: "robots", content: "noindex" },
      ];
    }
  }

  return [
    { title: "Error" },
    { name: "robots", content: "noindex" },
  ];
}