Android 4.4.4: Uncaught TypeError: Cannot redefine property: then

[conechan]

As title, this error throwed in some old Android devices (such as 4.4.4 KTU84P), due to core-js try to redefine the native promise.

    // wrap native Promise#then for native async functions
    redefine(NativePromise.prototype, 'then', function then(onFulfilled, onRejected) {
      var that = this;
      return new PromiseConstructor(function (resolve, reject) {
        nativeThen.call(that, resolve, reject);
      }).then(onFulfilled, onRejected);
    });

I've looked at #615, but seems not the same issue.

[conechan]

I run Object.getOwnPropertyDescriptor(Promise.prototype, 'then') on the device, it show the descriptor as below.

{
  configurable: false,
  enumerable: true,
  value: function()
  writable: true
}

It seems this error caused by the configurable: false.

[zloirock]

Are you sure that it's a native Promise? IIRC it was tested in Android 4.4. It looks like a non-correct polyfill, however, I'm not 100% sure.

[conechan]

Yes, it's a native Promise. And the browser env is a webview in our app, I am not sure whether it's a regular Android 4.4.4 webview.

I know it's an incorrect behavior :(

Are there any work around to solve this issue? If no, I have to downgrade and lock the core-js version to 3.1.4.

[zloirock]

I'll add a workaround.

[bdwain]

thanks for fixing this so quickly @zloirock. Are you planning on releasing the fix anytime soon? I see there's a few unreleased fixes out

[zloirock]

Now I haven't enough time for that. Little later.

[ghost]

Definitely don't want to rush you because I'm sure you're busy, but wanted to just state that this fix would be super helpful in a few spaces I'm in! :) Hope you can release soon.