What is typeof exports === 'object' && typeof module === 'object'?

Question

Hey! I saw this piece of code in any javascript code of a website or libraries like jQuery. Code :
if(typeof exports === 'object' && typeof module === 'object'){
module.exports = factory();
} else if (typeof define === 'function' && define.amd) {
define([], factory);
}

Answer 1

typeof returns the type of the variable. So "typeof exports" returns the type of the variable exports.

Answer 2

Knäcke Brot what is amd

Answer 3

You mean the manufactor of CPUs?

Answer 4

Knäcke Brot no,
Asynchronous module definition (AMD)

Answer 5

I don't know, but I think this could help you... https://github.com/amdjs/amdjs-api/wiki/AMD