Question

I am using socket.io 8.7. I use Webstorm as IDE for writing my network app.

Webstorm shows me an error when I write this:

io.sockets.in("some room id").emit(...)

Webstorm underlines the in with red and says “name expected”. The result in Webstorm showing the entire JavaScript file containing this code line as a broken code file.

Does anyone know how to tell Webstorm to ignore this error? It is very annoying as it covers real error messages.

Any suggestions are appreciated.

Answer 1

It’s happening because “in” is a reserved word in JavaScript. It’s an operator:

if ("someString" in someObject) {
  // someObject has a property called "someString"
}

In other words, that is a “real error”. Now, you can do this if you really really want a property/method called “in”:

io.sockets['in']("some room id").emit(...)