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links

The links function defines which <link> elements to add to the page when the user visits a route.

import type { LinksFunction } from "@remix-run/node"; // or cloudflare/deno

export const links: LinksFunction = () => {
  return [
    {
      rel: "icon",
      href: "/favicon.png",
      type: "image/png",
    },
    {
      rel: "stylesheet",
      href: "https://example.com/some/styles.css",
    },
    { page: "/users/123" },
    {
      rel: "preload",
      href: "/images/banner.jpg",
      as: "image",
    },
  ];
};

There are two types of link descriptors you can return:

HtmlLinkDescriptor

This is an object representation of a normal <link {...props} /> element. View the MDN docs for the link API.

The links export from a route should return an array of HtmlLinkDescriptor objects.

Examples:

import type { LinksFunction } from "@remix-run/node"; // or cloudflare/deno

import stylesHref from "../styles/something.css";

export const links: LinksFunction = () => {
  return [
    // add a favicon
    {
      rel: "icon",
      href: "/favicon.png",
      type: "image/png",
    },

    // add an external stylesheet
    {
      rel: "stylesheet",
      href: "https://example.com/some/styles.css",
      crossOrigin: "true",
    },

    // add a local stylesheet, remix will fingerprint the file name for
    // production caching
    { rel: "stylesheet", href: stylesHref },

    // prefetch an image into the browser cache that the user is likely to see
    // as they interact with this page, perhaps they click a button to reveal in
    // a summary/details element
    {
      rel: "prefetch",
      as: "image",
      href: "/img/bunny.jpg",
    },

    // only prefetch it if they're on a bigger screen
    {
      rel: "prefetch",
      as: "image",
      href: "/img/bunny.jpg",
      media: "(min-width: 1000px)",
    },
  ];
};

PageLinkDescriptor

These descriptors allow you to prefetch the resources for a page the user is likely to navigate to. While this API is useful, you might get more mileage out of <Link prefetch="render"> instead. But if you'd like, you can get the same behavior with this API.

export function links() {
  return [{ page: "/posts/public" }];
}

This loads up the JavaScript modules, loader data, and the stylesheets (defined in the links exports of the next routes) into the browser cache before the user even navigates there.

Be careful with this feature. You don't want to download 10MB of JavaScript and data for pages the user probably won't ever visit.