code: function csvToMapping(csvString) {
    const lines = csvString.split(/\n|\r|\r\n/);
    const header = lines.shift().split(',');
    const key = header.shift();
    const now = new Date();
    const headerIdx = [];
    const fields = [];
    header.forEach((h, i) => {
      if (h === '') return;
      headerIdx.push(i);
      fields.push({key: h, format: 'text'});
    });
    const mapping = {
      created: now.toString(),
      fields: fields,
      key: key,
      mapping: {}
    };
    lines.forEach(line => {
      const values = line.split(',');
      const k = values.shift();
      mapping.mapping[k] = Array(headerIdx.length);
      headerIdx.forEach(i => {
        mapping.mapping[k][i] = values[i];
      });
    });
    return mapping;
  }
docs: Convert csv text to field mapping
  @param {string} csvString - csv data text
  @return {object} field mapping