unload.js

$(window).on('beforeunload', () => {
      if (this.isOpponentConnected) {
        // tell opponent we disconnected
        this.statusRecord.set(`player-${this.isHost ? 1 : 2}`, {action: ACTION.DISCONNECT});
      }
      if (this.statusRecord) {
        // delete all records
        this.statusRecord.discard();
        this.statusRecord.delete();
        this.paddle1Record.discard();
        this.paddle1Record.delete();
        this.paddle2Record.discard();
        this.paddle2Record.delete();
        this.hitRecord.discard();
        this.hitRecord.delete();
        this.missRecord.discard();
        this.missRecord.delete();
        this.pingRecord.discard();
        this.pingRecord.delete();
      }
    });