lib/exceptions/ModuleDependencyNotMet.js
function ModuleDependencyNotMet(message) {
Error.call(this);
Error.captureStackTrace(this, this.constructor);
this.name = this.constructor.name;
this.message = message;
}
require('util').inherits(ModuleDependencyNotMet, Error);
module.exports = ModuleDependencyNotMet;