function scanLinkInMDFile()

in scripts/link-checker.js [112:187]
60 lines of code
15 McCabe index (conditional complexity)

function scanLinkInMDFile(filePath, project) {
  const fileContent = fs.readFileSync(filePath, 'utf-8');
  const regex = /\[[\s\S]*?\]\([\s\S]*?\)/g;
  if (fileContent.match(regex)) {
    const arrayOfLinks = fileContent.match(regex);
    const links = arrayOfLinks.map((item) => {
      const textHrefDivide = item.split('](');
      const text = textHrefDivide[0].replace('[', '');
      const url = textHrefDivide[1].replace(')', '');
      return ({ url, text, file: filePath });
    });

    // filter out links to other Markdown files
    const filteredList = []; // local files
    const unfilteredList = links.filter((link) => { // web links
      let url = link.url.trim();
      if (url.startsWith('http://') || url.startsWith('https://')) {
        // eslint-disable-next-line no-param-reassign
        link.url = url;
        return true;
      }

      // url preprocess
      if (url.startsWith('#') || url.indexOf('#') > 0) { // such as "#abcd"
        const split = url.split('#').filter((item) => item !== '');
        if (split.length > 1) {
          // eslint-disable-next-line no-param-reassign
          link.anchor = `#${split[1]}`;
          url = path.normalize(path.dirname(filePath) + path.sep + link.url);
        } else {
          // eslint-disable-next-line no-param-reassign
          link.anchor = link.url;
          url = filePath;
        }
      } else if (url === 'LICENSE' || url === 'logos/apache-apisix.png') {
        url = `https://github.com/apache/${project}/blob/master/${url}`;
      } else if (!url.endsWith('.md')) { // not end with ".md"
        console.log(filePath, link.url, url, filePath.startsWith('website\\docs'));
        const lang = !filePath.includes('i18n') ? 'en' : filePath.split(`i18n${path.sep}`)[1].split(path.sep)[0];
        let subPath = !filePath.includes('i18n') ? path.dirname(filePath.split(`docs${path.sep}${project}${path.sep}`)[1]) : path.dirname(filePath.split(`docs-${project}${path.sep}current${path.sep}`)[1]);
        subPath = subPath !== '.' ? subPath + path.sep : '';
        const originPath = path.normalize(`docs${path.sep}${lang}${path.sep}latest${path.sep}${subPath}${url}`).replace(/\\/g, '/');

        url = `https://github.com/apache/${project}/blob/master/${originPath}`;
      } else { // such as "./abcd", "../abcd", "../../../abcd"
        url = path.normalize(path.dirname(filePath) + path.sep + url);
      }

      // set url
      const originLink = link.url;
      // eslint-disable-next-line no-param-reassign
      link.url = url;

      // url postprocess
      if (!url.startsWith('http://') && !url.startsWith('https://')) {
        filteredList.push(link);
        return false;
      }

      // replace the converted link with the original document
      let documentContent = fs.readFileSync(filePath, 'utf8');
      documentContent = documentContent.replace(new RegExp(originLink, 'g'), link.url);
      fs.writeFileSync(filePath, documentContent, 'utf8');

      return true;
    });
    return {
      links: unfilteredList,
      filteredLinks: filteredList,
    };
  }
  return {
    links: [],
    filteredLinks: [],
  };
}