@backstage/plugin-techdocs/dist/reader/transformers/rewriteDocLinks.esm.js

The Backstage plugin that renders technical documentation for your components

const rewriteDocLinks = () => {
  return (dom) => {
    const updateDom = (list, attributeName) => {
      Array.from(list).filter((elem) => elem.hasAttribute(attributeName)).forEach((elem) => {
        const elemAttribute = elem.getAttribute(attributeName);
        if (elemAttribute) {
          if (elemAttribute.match(/^https?:\/\//i)) {
            elem.setAttribute("target", "_blank");
          }
          try {
            const normalizedWindowLocation = normalizeUrl(
              window.location.href
            );
            elem.setAttribute(
              attributeName,
              new URL(elemAttribute, normalizedWindowLocation).toString()
            );
          } catch (_e) {
            elem.replaceWith(elem.textContent || elemAttribute);
          }
        }
      });
    };
    updateDom(Array.from(dom.getElementsByTagName("a")), "href");
    return dom;
  };
};
function normalizeUrl(input) {
  const url = new URL(input);
  if (!url.pathname.endsWith("/") && !url.pathname.endsWith(".html")) {
    url.pathname += "/";
  }
  return url.toString();
}

export { normalizeUrl, rewriteDocLinks };
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