verifying script for checking templates from KDP

verify.js

const path = require('path');
const fs = require('fs');
const Table = require('cli-table');

const mainDir = path.join(__dirname, 'templates');

function findPath(filePath) {
  return new Promise(function(res, rej) {
    fs.readdir(filePath, (err, filenames) => {
      const filePaths = filenames
        .filter(filename => filename !== '.DS_Store')
        .map(filename => path.join(filePath, filename));

      res(filePaths);
    });
  });
}


findPath(mainDir)
.then(filePaths => {
  fliePaths = filePaths.map(filePath => findPath(filePath));

  return Promise.all(fliePaths);
}).then(arr => {
  const filePaths = arr.reduce((prev, cur) => {
    cur = cur.map(filePath => findPath(filePath));
    return prev.concat(cur);
  }, []);

  return Promise.all(filePaths);
}).then(arr => {
  const files = arr.reduce((prev, cur) => {
    cur = cur
      .filter(filePath => path.extname(filePath) === '.json')
      .map(filePath => {
        return new Promise(function(res, rej) {
          fs.readFile(filePath, 'utf8', (err, fileData) => {
            if (err) rej(err);

            res({
              content: fileData,
              filePath
            });
          });
        })
      });

    return prev.concat(cur);
  }, []);

  return Promise.all(files)
}).then(arr => {
  const table = new Table({
    head: ['Filename', 'Size', 'Left Margin', 'Top Margin', 'Full Path']
  });

  try {
    arr.forEach(({content, filePath}) => {
      const templateObj = JSON.parse(content.trim());

      const { left, top } = templateObj.objects[0];

      if (left > 0 || top > 0) {
        const filename = path.parse(filePath).name;
        const leftResult = left > 0 ? left : 'valid';
        const topResult = top > 0 ? top : 'valid';
        const fullPath = path.join.apply(path, filePath.split(path.sep).slice(5));
        const size = filename.match(/320x50|300x250|800x160/)[0];

        table.push([filename, size, leftResult, topResult, fullPath]);
      }
    });
  } catch (err) {
    console.err(err)
  }

  console.info(table.toString());
});