now-deployment/node_modules/now/dist/util/dev/templates/error.ts

import encodeHTML from 'escape-html';

interface Inputs {
  http_status_code: number;
  http_status_description: string;
  error_code?: string;
  now_id: string;
}

export default function error(it: Inputs): string {
    let out =
      '<main> <p class="devinfo-container"> <span class="error-code"><strong>' +
      it.http_status_code +
      '</strong>: ' +
      encodeHTML(it.http_status_description) +
      '</span> ';
    if (it.error_code) {
      out +=
        ' <span class="devinfo-line">Code: <code>' +
        encodeHTML(it.error_code) +
        '</code></span> ';
    }
    out +=
      ' <span class="devinfo-line">ID: <code>' +
      encodeHTML(it.now_id) +
      '</code> </p></main>';
    return out;
  }