Need to extends static getters and setters.

[vilicvane]

Maybe something like this?

var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) Object.defineProperty(d, p, Object.getOwnPropertyDescriptor(b, p));
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};

Or is there a better polyfill around the corner?

[mhegazy]

looks right to me.

Also related to #2009

[vilicvane]

Consider this:

class A {
    static y;
    static get x() {
        return this.y;
    }
}

class B extends A { }

B.y = 123;
console.log(B.x);

The code emitted by TypeScript will log undefined, while Babel will handle it correctly.

[vilicvane]

I guess you might expect us to define customized helper, but this could be a common usage I think.

[vilicvane]

@mhegazy Hi, this is still an issue. __extends should copy the property descriptor instead of the value directly. Currently the helper is doing:

d[p] = b[p];

But it should better do:

Object.defineProperty(d, p, Object.getOwnPropertyDescriptor(b, p));

[DanielRosenwasser]

I think this has always been an issue, which is why users are free to use their own __extends. See @RyanCavanaugh's comment on #1520 (comment)

[DanielRosenwasser]

Marking this as a duplicate of #1520.

[vilicvane]

@DanielRosenwasser Thanks for the information!