index.js

const fs = require('fs');
const path = require('path');
const findup = require('findup');
const sortScripts = require('sort-scripts');

function findPkg(dir) {
  try {
    return path.join(findup.sync(dir, 'package.json'), 'package.json');
  } catch (err) {
    console.log(err);
    throw new Error('No package.json file found');
  }
}

module.exports = function SCRIPTS(originalContent, options = {}, config) {
  let pkgPath;

  if (options && options.pkg) {
    pkgPath = path.resolve(path.dirname(config.originalPath), options.pkg);
  } else {
    pkgPath = findPkg(config.originalPath);
  }

  const { scripts } = JSON.parse(fs.readFileSync(pkgPath, 'utf8'));

  const rows = originalContent.trim().split('\n').map(s => s.trim());
  const headerIndex = rows.findIndex(row => row.startsWith('|-'));

  const details = (headerIndex !== -1 ? rows.slice(headerIndex + 1) : rows)
    .map(row => row.split('|').map(s => s.trim()).filter(s => !!s))
    .filter(([script]) => !!script)
    .reduce((obj, [script, description]) => {
      obj[script.replace(/`/g, '')] = description;
      return obj;
    }, {});

  return ['| Script | Description |', '|--------|-------------|']
    .concat(
      sortScripts(scripts).map(([name, script]) => {
        const description = details[name] || `\`${script}\``;
        const label = `\`${name}\``;
        return `| ${label} | ${description} |`;
      })
    )
    .join('\n');
};