javascript - Separating instances of require in node -

say example have 2 files a.js , b.js both :

var some_package = require('some_package');

i call a.dosomething() , b.dosomething(), in both files, same instance used - therefore altering states inside "some_package" - didn't want happen.

what want create separate instance of some_package in , b. possible despite module caching of node.js?

a.dosomething() , b.dosomething() affect required module's state if function dosomething accesses internal module scope variable. e.g.

// some_package.js var modulescopevariable = 0;  // acts global module  exports.dosomething = function() {   return ++modulescopevariable; // change modulescopevariable }; 

one way around expose constructor function instead, put state in instance object, , make sure not access module scope vars in dosomething.

// some_package.js exports.doer = function() {   this.objectscopevariable = 0;   this.dosomething = function() {     return ++this.objectscopevariable;   } }  // test var = require("some_package.js"); var doer = new a.doer(); doer.dosomething(); 

one other way keep state control within module , tie state function

// a.js , b.js var somepackage = require("some_package.js"); var mycontext = {    localstate: 0 };  // change dosomething accept context somepackage.dosomething(mycontext);  // or use bind bind context new function var mydosomething =  somepackage.dosomething.bind(mycontext); 

lastly, possible invalidate require cache not idea. see node.js require() cache - possible invalidate?