Get all file paths in a directory recursively

walkDirSync.js

const path = require('path')
const fs = require('fs')

function walkDirSync (dir) {
  return fs.readdirSync(dir).reduce((filePaths, fileName) => {
    const filePath = path.join(dir, fileName)
    if (fs.statSync(filePath).isDirectory()) {
      return filePaths.concat(walkDirSync(filePath))
    }

    return filePaths.concat(filePath)
  }, [])
}