sitegen/framework/meta/nextjs/generate/icons.tsx

import type { ResolvedMetadata } from "../types/metadata-interface";
import type { Icon, IconDescriptor } from "../types/metadata-types";

import React from "react";

function IconDescriptorLink({ icon }: { icon: IconDescriptor }) {
  const { url, rel = "icon", ...props } = icon;

  return <link rel={rel} href={url.toString()} {...props} />;
}

function IconLink({ rel, icon }: { rel?: string; icon: Icon }) {
  if (typeof icon === "object" && !(icon instanceof URL)) {
    if (rel) icon.rel = rel;
    return <IconDescriptorLink icon={icon} />;
  } else {
    const href = icon.toString();
    return <link rel={rel} href={href} />;
  }
}

export function IconsMetadata({ icons }: { icons: ResolvedMetadata["icons"] }) {
  if (!icons) return null;

  const shortcutList = icons.shortcut;
  const iconList = icons.icon;
  const appleList = icons.apple;
  const otherList = icons.other;

  return (
    <>
      {shortcutList
        ? shortcutList.map((icon, index) => (
          <IconLink
            key={`shortcut-${index}`}
            rel="shortcut icon"
            icon={icon}
          />
        ))
        : null}
      {iconList
        ? iconList.map((icon, index) => (
          <IconLink key={`shortcut-${index}`} rel="icon" icon={icon} />
        ))
        : null}
      {appleList
        ? appleList.map((icon, index) => (
          <IconLink
            key={`apple-${index}`}
            rel="apple-touch-icon"
            icon={icon}
          />
        ))
        : null}
      {otherList
        ? otherList.map((icon, index) => (
          <IconDescriptorLink key={`other-${index}`} icon={icon} />
        ))
        : null}
    </>
  );
}