Convert relative paths to absolute paths inside html string

absolutify.js

/**
 * Convert relative paths to absolute paths
 * @author HaNdTriX
 * @param {string} html - HTML string
 * @param {string} baseUrl - base url to prepend to relative paths
 * @param  {string[]} [attributes] - attributes to convert
 * @returns {string}
 */
function absolutify(
  html,
  baseUrl,
  attributes = [
    "href",
    "src",
    "srcset",
    "cite",
    "background",
    "action",
    "formaction",
    "icon",
    "manifest",
    "code",
    "codebase",
  ]
) {
  // Build the regex to match the attributes.
  const regExp = new RegExp(
    `(?<attribute>${attributes.join(
      "|"
    )})=(?<quote>['"])(?<path>.*?)\\k<quote>`,
    "gi"
  );

  return html.replaceAll(regExp, (...args) => {
    // Get the matched groupes
    const { attribute, quote, path } = args[args.length - 1];

    // srcset may have multiple paths `<url> <descriptor>, <url> <descriptor>`
    if (attribute.toLowerCase() === "srcset") {
      const srcSetParts = path.split(",").map((dirtyPart) => {
        const part = dirtyPart.trim();
        const [path, size] = part.split(" ");
        return `${new URL(path.trim(), baseUrl).toString()} ${size || ""}`;
      });

      return `${attribute}=${quote}${srcSetParts.join(", ")}${quote}`;
    }

    const absoluteURL = new URL(path, baseUrl).href;
    return `${attribute}=${quote}${absoluteURL}${quote}`;
  });
}