readonly is simple reference restriction library between custom modules in node object.
npm install readonly
var readonly = require('readonly');
var obj = {'A':'a','B':'b','C':'c'};
// Normal ACL. You can use `obj` through moduleA as you like
var moduleA = {};
moduleA.obj = obj;
// Readonly restriction of `obj` in moduleB
var moduleB = {};
moduleB.obj = readonly(obj);
// You can update `obj` from moduleA
moduleA.obj.A = "d";
// This updates can be seen from moduleB
console.log(moduleB.obj.A); // --> "d"
// But if you update `obj` through moduleB, it will throws `UnableRewriteException`
moduleA.obj.B = "e"; // --> UnableRewriteException: original cannot be rewriteMIT License. Please see the LICENSE file for details.