Categories
browser-sync gulp javascript node.js nodemon

Node.js – Auto Refresh In Dev

I am trying to improve the DEV experience in my Node. To do that, I want to:

a) restart my server when server-side code is changed

b) refresh the browser when client-side code is changes.

In an effort to accomplish this, I began integrating nodemon and browserSync into my gulp script.

In my gulp script, I have the following task:

gulp.task('startDevEnv', function(done) {
// Begin watching for server-side file changes
nodemon(
{ script: input.server, ignore:[input.views] })
.on('start', function () {
browserSync.init({
proxy: "http://localhost:3002"
});
})
;
// Begin watching client-side file changes
gulp.watch([ input.css, input.js, input.html ], function() { browserSync.reload(); });
done();
});

When the above task runs, my browser opens to http://localhost:3000/. My app is visible as expected. However, in the console window, I notice:

Error: listen EADDRINUSE :::3002

I understand to some extend. I have app.set('port', process.env.PORT || 3002); in my server.js file. Yet, I thought that was purpose of setting the proxy value. Still, whenever I make a code change, I see the following related error in my console window:

[07:08:19] [nodemon] restarting due to changes...
[07:08:19] [nodemon] starting `node ./dist/server.js`
events.js:142
throw er; // Unhandled 'error' event
^
TypeError: args.cb is not a function
at Object.init (/Users/me/Website/Develop/node_modules/browser-sync/lib/public/init.js:25:25)
at null.<anonymous> (/Users/me/Website/Develop/gulpfile.js:142:25)
at emitNone (events.js:73:20)
at emit (events.js:167:7)
at Object.run (/Users/me/Website/Develop/node_modules/nodemon/lib/monitor/run.js:97:7)
at Function.run.kill (/Users/me/Website/Develop/node_modules/nodemon/lib/monitor/run.js:221:7)
at null.<anonymous> (/Users/me/Website/Develop/node_modules/nodemon/lib/monitor/run.js:333:7)
at emitOne (events.js:83:20)
at emit (events.js:170:7)
at restartBus (/Users/me/Website/Develop/node_modules/nodemon/lib/monitor/watch.js:162:7)
Me-MBP:Develop me$ events.js:142
throw er; // Unhandled 'error' event
^
Error: listen EADDRINUSE :::3002
at Object.exports._errnoException (util.js:856:11)
at exports._exceptionWithHostPort (util.js:879:20)
at Server._listen2 (net.js:1238:14)
at listen (net.js:1274:10)
at Server.listen (net.js:1370:5)
at Object.<anonymous> (/Users/me/Website/Develop/dist/server.js:70:8)
at Module._compile (module.js:399:26)
at Object.Module._extensions..js (module.js:406:10)
at Module.load (module.js:345:32)
at Function.Module._load (module.js:302:12)

At this point, my code changes do not appear in my browser. I do not understand what I’m doing wrong. I suspect I have my ports misconfigured. But, I’m not really sure how they should be setup.

By default BrowserSync uses port 3000. BrowserSync also uses port 3001 for the BrowserSync UI. For these two reasons, I thought I would set the port to 3002 in my server.js file and create the proxy shown above. What am I doing wrong?