Before assign value to exports, module.exports === exports, but after
assign value, they're not equal. In my view, they're point to the same
reference.
BTW, if I modify to module.exports.Rect = Rect, then module.exports ===
exports
function Rect(w,h) {
this.w = w;
this.h = h;
};
Rect.prototype.area = function(){
return this.w*this.h;
};
console.log(module.exports === exports);//true
module.exports = Rect;
console.log(module.exports);
console.log(exports);
console.log(module.exports === exports);//false
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