Re: Elemental2 WebRTC createOffer and createAnswer are incorrect

*Elemental2 (not Element2 🙂).  Ie:  https://github.com/google/elemental2

On Tuesday, 15 July 2025 at 3:55:58 pm UTC+10 Craig Mitchell wrote:

I'm trying to use Element2 to create a WebRTC connection.

In the elemental2.dom.RTCPeerConnection class, there are a bunch of createOffer and createAnswer methods that all return Promise<RTCSessionDescription>.

If I try to use them, I get a ClassCastException.  This is because GWT is trying to create the RTCSessionDescription from the JS object, and it can't.

I believe all these createOffer and createAnswer methods should be returning Promise<RTCSessionDescriptionInit> instead.

For reference, this is the Element2 RTCSessionDescription:

package elemental2.dom;

import jsinterop.annotations.JsPackage;
import jsinterop.annotations.JsType;

@JsType(isNative = true, namespace = JsPackage.GLOBAL)
public class RTCSessionDescription {
  public String sdp;
  public String type;
  public RTCSessionDescription() {}
  public RTCSessionDescription(RTCSessionDescriptionInit descriptionInitDict) {}
}

And this is the Element2 RTCSessionDescriptionInit:

package elemental2.dom;

import jsinterop.annotations.JsOverlay;
import jsinterop.annotations.JsPackage;
import jsinterop.annotations.JsProperty;
import jsinterop.annotations.JsType;
import jsinterop.base.Js;
import jsinterop.base.JsPropertyMap;

@JsType(isNative = true, namespace = JsPackage.GLOBAL)
public interface RTCSessionDescriptionInit {
  @JsOverlay
  static RTCSessionDescriptionInit create() {
    return Js.uncheckedCast(JsPropertyMap.of());
  }

  @JsProperty
  String getSdp();

  @JsProperty
  String getType();

  @JsProperty
  void setSdp(String sdp);

  @JsProperty
  void setType(String type);
}

Is it somehow possible to fix up Elemental2 createOffer and createAnswer methods?

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