List all global variables in Node.js

Question

I'm trying to list all of the global variables, including those refering to built-in objects.

In Chrome's console I can simply type this and get back all the keys, including things like String, Number, etc.

However when I do this in Node.js I get much less:

> Object.keys(this)
[ 'global',
  'process',
  'GLOBAL',
  'root',
  'Buffer',
  'setTimeout',
  'setInterval',
  'clearTimeout',
  'clearInterval',
  'setImmediate',
  'clearImmediate',
  'console',
  'module',
  'require',
  '_' ]
> this.eval
[Function: eval]

Where is this.eval coming from?

Answer 1

The built-in properties of the global object are non-enumerable, so Object.keys doesn't return them. You can use Object.getOwnPropertyNames instead.

Answer 2

The following globals() function will get you global namespace object:

function globals() { return this; }

With it you can list all variables of global namespace anytime you want:

function varsList() {
  return Object.getOwnPropertyNames(globals());
}