PresentationEvent

type PresentationEvent = 
  | {
  type: SetLocalMediaStream;
  mediaStream?: MediaStream;
}
  | {
  type: SetRemoteMediaStream;
  mediaStream?: MediaStream;
}
  | {
  type: SetEmphasis;
  emphasis: PresentationEmphasis;
}
  | {
  type: SetExpandPrimary;
  expandPrimary: boolean;
}
  | {
  type: SetShowSteal;
  showSteal: boolean;
}
  | {
  type: SetSize;
  size: PresentationSize;
}
  | {
  type: SetPresenterName;
  presenterName?: string;
}
  | {
  type: ActivityChange;
  activity: PresentationActivityState;
};