オブジェクトの最初の部分のみ削除

const songRequestQueue = [
  {
    playList: {
      genre: "팝",
      title: "Sugar",
      singer: "마룬파이브",
    },
    customerName: "1번고객",
  },
  {
    playList: {
      genre: "팝",
      title: "Pysical",
      singer: "두아리파",
    },
    customerName: "2번고객",
  },
  {
    playList: {
      genre: "팝",
      title: "노스텔지아",
      singer: "두아리파",
    },
    customerName: "3번고객",
  },
];

    if (singer && !genre && !type) {
      for (let i = 0; i < this.songRequestQueue.length; i++) {
        if (this.songRequestQueue[i].playList.singer === singer) {
          delete this.songRequestQueue[i];
          break;
        }
      }
    }

    if (singer && !genre && !type) {
      this.songRequestQueue.splice(
        this.songRequestQueue.findIndex(
          (req: SongRequest) => req.playList.singer === singer
        ),
        1
      );
    }