Require optional files

I want to require localConfig.js which in .gitignore and can not exist on particular machine. For the server side code there is a try-catch hook:

var local = {}; // default value
try {
        local = require('./local');
    }
} catch (e) {
    // file not found
}

But webpack will log a warning anyway:

WARNING in ./config/serverConfig.js
Module not found: Error: Cannot resolve 'file' or 'directory' ./local in /Users/dm.kuznetsov/square/config

I cannot use fs, because my code is isomorphic.

How can I require a file, which can not exist properly?

[bebraw]

Can you re-open at Stack Overflow for more ideas?

[bebraw]

Technically you could push the problem to configuration side now and perform aliasing there after you check.