js log binded object

Question

I have a function binded to an object, how can I access to the object at the same scope with the function?

let f = function(){};
class A{}
f = f.bind(new A());
// console.log(f.bindedObject)

---

what about in a method?

class B{
    constructor(func){
        this.func = func;
    }

    log(){
        // console.log(this.func.bindedObject)
    }
}

class A{}
let b = new B(function(){}.bind(new A()));
b.log()

Answer 1

You could overwrite the bind method

(function() {
    let bind = Function.prototype.bind;
    Function.prototype.bind = function(newThis) {
        let bf = bind.apply(this, arguments);
        bf.newThis = newThis;
        return bf;
    };
})();

var f = function() {};
var nf = f.bind({'hello':1});
console.log('newThis', nf.newThis);