old_contents: "use strict";
  var t0 = Date.now();
  
  var express = require("express"),
      xhub = require('express-x-hub');
  
  if (process.env.NODE_ENV === "dev") {
      // Load local env variables
      require("./env");
  }
  
  function logArgs() {
      var args = arguments;
      process.nextTick(function() {
          console.log.apply(console, args);
      });
  }
  
  var app = express();
  app.use(xhub({ algorithm: 'sha1', secret: process.env.GITHUB_SECRET }));
  
  app.post('/github-hook', function (req, res, next) {
      if (process.env.NODE_ENV != 'production' || req.isXHubValid()) {
          res.send(new Date().toISOString());
          var payload = req.body;
          switch(payload.action) {
              case "opened":
              case "edited":
              case "reopened":
              case "synchronize":
                  require("./lib/comment")(payload.pull_request).then(logArgs, logArgs);
                  break;
              default:
                  logArgs("Unused request", payload.action, payload.pull_request.base.repo.full_name, payload.number);
          }
      } else {
          logArgs("Unverified request", req);
      }
      next();
  });
  
  var port = process.env.PORT || 5000;
  app.listen(port, function() {
      console.log("Express server listening on port %d in %s mode", port, app.settings.env);
      console.log("App started in", (Date.now() - t0) + "ms.");
  });
  
new_contents: "use strict";
  var t0 = Date.now();
  
  var express = require("express"),
      xhub = require('express-x-hub');
  
  if (process.env.NODE_ENV === "dev") {
      // Load local env variables
      require("./env");
  }
  
  function logArgs() {
      var args = arguments;
      process.nextTick(function() {
          console.log.apply(console, args);
      });
  }
  
  var app = express();
  app.use(xhub({ algorithm: 'sha1', secret: process.env.GITHUB_SECRET }));
  
  app.post('/github-hook', function (req, res, next) {
      if (process.env.NODE_ENV != 'production' || req.isXHubValid()) {
          res.send(new Date().toISOString());
          var payload = req.body;
          switch(payload.action) {
              case "opened":
              case "edited":
              case "reopened":
              case "synchronize":
                  require("./lib/comment")(payload.pull_request).then(logArgs, logArgs);
                  break;
              default:
                  logArgs("Unknown request", JSON.stringify(payload, null, 4));
          }
      } else {
          logArgs("Unverified request", req);
      }
      next();
  });
  
  var port = process.env.PORT || 5000;
  app.listen(port, function() {
      console.log("Express server listening on port %d in %s mode", port, app.settings.env);
      console.log("App started in", (Date.now() - t0) + "ms.");
  });
  
subject: Deal with exceptions more cleanly.