Simple sitemap.xml file for Svelte/Sapper blog project

sitemap.xml.js

import posts from "./blog/_posts";
const fs = require('fs');

const BASE_URL = "https://www.zechtyounes.tech";  // TO CHANGE
const pages = [""];

fs.readdirSync("./src/routes").forEach(file => {
  file = file.split('.')[0];
  if (file.charAt(0) !== '_' && file !== "sitemap" && file !== "index") {
    pages.push(file);
  }
});

const render = (pages, posts) => `<?xml version="1.0" encoding="UTF-8" ?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
  ${pages
    .map(
      page => `
    <url><loc>${BASE_URL}/${page}</loc><priority>0.85</priority></url>
  `
    )
    .join("\n")}
  ${posts
    .map(
      post => `
    <url>
      <loc>${BASE_URL}/blog/${post.slug}</loc>
      <priority>0.69</priority>
    </url>
  `
    )
    .join("\n")}
</urlset>
`;

export function get(req, res, next) {
  res.setHeader("Cache-Control", `max-age=0, s-max-age=${600}`); // 10 minutes
  res.setHeader("Content-Type", "application/rss+xml");

  const sitemap = render(pages, posts);
  res.end(sitemap);
}

If using Sapper export, you probably need to fetch sitemap.xml so that it gets exported. Since the --entry option is only for directories, something like sveltejs/sapper#461 (comment) might be needed