node_modules/readdirp/examples/stream-api-pipe.js

var readdirp =  require('..')
  , path = require('path')
  , through = require('through2')

// print out all JavaScript files along with their size
readdirp({ root: path.join(__dirname), fileFilter: '*.js' })
  .on('warn', function (err) { console.error('non-fatal error', err); })
  .on('error', function (err) { console.error('fatal error', err); })
  .pipe(through.obj(function (entry, _, cb) { 
    this.push({ path: entry.path, size: entry.stat.size });
    cb();
  }))
  .pipe(through.obj(
    function (res, _, cb) { 
      this.push(JSON.stringify(res) + '\n');
      cb();
    })
  )
  .pipe(process.stdout);