workerjs/requireworker.js

Server Web Workers for node.js that work

var fs = require('fs');
process.once('message', function (modulePath) {
  var noop = function () { };
  global.self = {
    postMessage: function (msg) {
      process.send(JSON.stringify({ data: msg }));
    },
    onmessage: noop,
    onerror: noop,
    addEventListener: function (eventName, cb) {
      if (eventName === 'message') {
        global.onmessage = global.self.onmessage = cb;
      } else if (eventName === 'error') {
        global.onerror = global.self.onerror = cb;
      }
    }
  };

  global.importScripts = function () {
    var fs = require('fs');
    var path = require('path');
    var files = Array.prototype.slice.call(arguments);
    var script =
      files
        .map(function (file) {
          return fs.readFileSync(file, 'utf8');
        })
        .join('\n');
    var vm = require('vm');
    var script = vm.createScript(script);
    script.runInThisContext();
  };

  Object.keys(global.self).forEach(function (key) {
    global[key] = global.self[key];
  });

  process.on('message', function (msg) {
    global.self.onmessage && global.self.onmessage(JSON.parse(msg));
  });
  process.on('error', function (err) {
    global.self.onerror && global.self.onerror(err);
  });

  var module = require(modulePath);
  if (typeof module === 'function') module();
});