How to use the @jupyterlab/csvviewer.parseDSV function in @jupyterlab/csvviewer

it('handles changing the field delimiter', () => {
      let data = `a\tb\tc\td\n0\t1\t2\t3\n4\t5\t6\t7\n`;
      let options = { data, delimiter: '\t', rowDelimiter: '\n' };
      let results;

      results = parser({ ...options, columnOffsets: false });
      expect(results.nrows).to.eql(3);
      expect(results.offsets).to.eql([0, 8, 16]);

      results = parser({ ...options, columnOffsets: true });
      expect(results.nrows).to.eql(3);
      expect(results.ncols).to.eql(4);
      expect(results.offsets).to.eql([
        0,
        2,
        4,
        6,
        8,
        10,
        12,
        14,
        16,
        18,
        20,
        22
      ]);

it('handles quotes with field delimiters', () => {
      let data = `a,"b,c",d\n"e","f"`;
      let options = { data, rowDelimiter: '\n' };
      let results;

      results = parser({ ...options, columnOffsets: false });
      expect(results.nrows).to.eql(2);
      expect(results.offsets).to.eql([0, 10]);

      results = parser({ ...options, columnOffsets: true });
      expect(results.nrows).to.eql(2);
      expect(results.ncols).to.eql(3);
      expect(results.offsets).to.eql([0, 2, 8, 10, 14, 17]);
    });