test.js

var async   = require('async');
var locals  = [];
var test    = function(value, locals, done) {
  console.log('value', value, 'locals', locals);
  locals.push(value);
  done();
};

async.series([
  test.bind(null, 'this is #1', locals),
  test.bind(null, 'this is #2', locals),
  test.bind(null, 'this is #3', locals)
]);