export default function extension(widget){

  const ext = {

    src: "",

    init: async () => {

      // let other extensions set this.src if needed 
      await widget.emit("init.thumb", widget.ext.thumb )

      if( widget.ext.thumb.src ){
        document.body.style.background = `url(${widget.ext.thumb.src}) no-repeat center / cover`
      }
    }

  }

  widget.ext.thumb = ext 

  // register async listeners
  widget.on("init", ext.init.bind(ext) )
    
}