babel-minify breaks polyfills added to global built-in objects

[redneb]

Suppose that I try to add a new method to the global Math object as follows:

(function () {
	Math["addOne"] = function(x) {return x + 1};
	console.log(Math.addOne(1), Math.addOne(2));
}());

Then minifying that with the babel-minify cli application, I get the following output (pretty printed):

(function() {
    var a = Math.addOne;
    Math.addOne = function(a) {
        return a + 1
    },
    console.log(a(1), a(2))
}
)();

As you can see, an alias to the method is created, but that happens before the method was defined, so the alias will be invalid and the code will not work.

If change Math["addOne"] = ... to Math.addOne = ... in the definition of the method, then everything works fine. The problem is that in my actual code, I cannot control how the method is defined, because the method is a polyfill for Math.sign which is provided by core-js, which uses Object.defineProperty to define it.

[redneb]

This has not been resolved. With the latest version of babel-minify I still have a problem when the above example is written with Object.defineProperty, e.g.

(function () {
	Object.defineProperty(
		Math,
		'addOne', {
			value: function(x) {return x + 1}
		});
	console.log(Math.addOne(1), Math.addOne(2));
}());

is minified to:

(function() {
    var a = Math.addOne;
    Object.defineProperty(Math, "addOne", {
        value: function(a) {
            return a + 1
        }
    }), console.log(a(1), a(2))
})();

As you can see, we have the same problem as before, i.e. the alias a to the method Math.addOne is defined before the method itself. This breaks core-js which uses Object.defineProperty to define its polyfills.