Nodejs + Require instanceof behaviour

Question

I\'m encountering a strange behaviour with instanceof in NodeJs. I\'m trying to creating a module which throws exceptions which can be caught by consuming modules and dealt

Answer 1

FOUND IT

To use your example, in file one.js I had:

var mod = require('mymodule');

but in another file two.js I had:

var mod = require('Mymodule');

and everything seemed to work exactly the same, except when you compared an error created from one.js using instanceof in two.js!.

Absurdly, node.js allows you to do a case-insensitive require, except it's not really case-insensitive, it actually requires your file twice, which is why instanceof returns false – the constructors are two different functions from two different module instances!

TL;DR

Make sure all your require strings are case-consistent.