Where to change objects prototypes in node.js?

Question

I want to add or override some standard methods of Object, Function and Array (e.g., like suggested in this answer) in node.js application. How should I do all the "patches" in just one module so that it affects all my other modules?

Will it be enough if I do it in a module that is just require'd or it won't work because the two modules have different global namespaces so they have different Object?... Or should I run some initialisation function after require that makes all these "patches" working in this module too?

user934801 · Accepted Answer · 2013-01-15 00:51:24Z

14

//require the util.js file 
require('./util.js');

var a = [];
a.doSomething();

in your "util.js" file:

//in your util.js file you don't have to write a module, just write your code...
Array.prototype.doSomething = function(){console.log("doSomething")};

answered Jan 15, 2013 at 0:51

user934801

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ckknight · Accepted Answer · 2013-01-15 00:33:58Z

7

Each file loaded shares the same primordial objects like Object, Array, etc, unless run in a different vm Context, so requiring the file once in your initialization will make the changes everywhere.

answered Jan 15, 2013 at 0:33

ckknight

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3 Comments

esp Over a year ago

Do you mean that it's even enough to require this module with "patches" once, only in my main module, and I don't need to require it in every module I want to have Object&co "patched"?

Nathan Wall Over a year ago

Yes, it's enough to require it just once. All modules in node share the same global scope. They have a different module scope, but the same global scope. So they have the same Object, Function, Array, etc.

esp Over a year ago

It works for Function.prototype and Array.prototype, but when I try to do it with Object.prototype it throws TypeError: TypeError: Property description must be an object: undefined at Function.defineProperty (native) at Object.<anonymous> (/opt/nginx/html/dev.stockscompare/node_modules/express/lib/express.js:53:10)

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