How to use the token-types.INT8 function in token-types

get: (buf, off): IID3v2header => {
    return {
      // ID3v2/file identifier   "ID3"
      fileIdentifier: new Token.StringType(3, 'ascii').get(buf, off),
      // ID3v2 versionIndex
      version: {
        major: Token.INT8.get(buf, off + 3),
        revision: Token.INT8.get(buf, off + 4)
      },
      // ID3v2 flags
      flags: {
        // Raw flags value
        raw: Token.INT8.get(buf, off + 4),
        // Unsynchronisation
        unsynchronisation: common.strtokBITSET.get(buf, off + 5, 7),
        // Extended header
        isExtendedHeader: common.strtokBITSET.get(buf, off + 5, 6),
        // Experimental indicator
        expIndicator: common.strtokBITSET.get(buf, off + 5, 5),
        footer: common.strtokBITSET.get(buf, off + 5, 4)
      },
      size: UINT32SYNCSAFE.get(buf, off + 6)
    };
  }
};

get: (buf, off): IID3v2header => {
    return {
      // ID3v2/file identifier   "ID3"
      fileIdentifier: new Token.StringType(3, 'ascii').get(buf, off),
      // ID3v2 versionIndex
      version: {
        major: Token.INT8.get(buf, off + 3),
        revision: Token.INT8.get(buf, off + 4)
      },
      // ID3v2 flags
      flags: {
        // Raw flags value
        raw: Token.INT8.get(buf, off + 4),
        // Unsynchronisation
        unsynchronisation: common.strtokBITSET.get(buf, off + 5, 7),
        // Extended header
        isExtendedHeader: common.strtokBITSET.get(buf, off + 5, 6),
        // Experimental indicator
        expIndicator: common.strtokBITSET.get(buf, off + 5, 5),
        footer: common.strtokBITSET.get(buf, off + 5, 4)
      },
      size: UINT32SYNCSAFE.get(buf, off + 6)
    };

public get(buf: Buffer, off: number): IStszAtom {

    const nrOfEntries = Token.INT32_BE.get(buf, off + 8);

    return {
      version: Token.INT8.get(buf, off),
      flags: Token.INT24_BE.get(buf, off + 1),
      sampleSize: Token.INT32_BE.get(buf, off + 4),
      numberOfEntries: nrOfEntries,
      entries: readTokenTable(buf, Token.INT32_BE, off + 12, this.len - 12, nrOfEntries)
    };
  }
}