sheetjs/bits/51_xlsxmeta.js

function parse_xlmeta_xml(data, name, opts) {
  var out = { Types: [], Cell: [], Value: [] };
  if (!data)
    return out;
  var pass = false;
  var metatype = 2;
  var lastmeta;
  data.replace(tagregex, function(x) {
    var y = parsexmltag(x);
    switch (strip_ns(y[0])) {
      case "<?xml":
        break;
      case "<metadata":
      case "</metadata>":
        break;
      case "<metadataTypes":
      case "</metadataTypes>":
        break;
      case "<metadataType":
        out.Types.push({ name: y.name });
        break;
      case "</metadataType>":
        break;
      case "<futureMetadata":
        for (var j = 0; j < out.Types.length; ++j)
          if (out.Types[j].name == y.name)
            lastmeta = out.Types[j];
        break;
      case "</futureMetadata>":
        break;
      case "<bk>":
        break;
      case "</bk>":
        break;
      case "<rc":
        if (metatype == 1)
          out.Cell.push({ type: out.Types[y.t - 1].name, index: +y.v });
        else if (metatype == 0)
          out.Value.push({ type: out.Types[y.t - 1].name, index: +y.v });
        break;
      case "</rc>":
        break;
      case "<cellMetadata":
        metatype = 1;
        break;
      case "</cellMetadata>":
        metatype = 2;
        break;
      case "<valueMetadata":
        metatype = 0;
        break;
      case "</valueMetadata>":
        metatype = 2;
        break;
      case "<extLst":
      case "<extLst>":
      case "</extLst>":
      case "<extLst/>":
        break;
      case "<ext":
        pass = true;
        break;
      case "</ext>":
        pass = false;
        break;
      case "<rvb":
        if (!lastmeta)
          break;
        if (!lastmeta.offsets)
          lastmeta.offsets = [];
        lastmeta.offsets.push(+y.i);
        break;
      default:
        if (!pass && opts.WTF)
          throw new Error("unrecognized " + y[0] + " in metadata");
    }
    return x;
  });
  return out;
}
function write_xlmeta_xml() {
  var o = [XML_HEADER];
  o.push('<metadata xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:xlrd="http://schemas.microsoft.com/office/spreadsheetml/2017/richdata" xmlns:xda="http://schemas.microsoft.com/office/spreadsheetml/2017/dynamicarray">\n  <metadataTypes count="1">\n    <metadataType name="XLDAPR" minSupportedVersion="120000" copy="1" pasteAll="1" pasteValues="1" merge="1" splitFirst="1" rowColShift="1" clearFormats="1" clearComments="1" assign="1" coerce="1" cellMeta="1"/>\n  </metadataTypes>\n  <futureMetadata name="XLDAPR" count="1">\n    <bk>\n      <extLst>\n        <ext uri="{bdbb8cdc-fa1e-496e-a857-3c3f30c029c3}">\n          <xda:dynamicArrayProperties fDynamic="1" fCollapsed="0"/>\n        </ext>\n      </extLst>\n    </bk>\n  </futureMetadata>\n  <cellMetadata count="1">\n    <bk>\n      <rc t="1" v="0"/>\n    </bk>\n  </cellMetadata>\n</metadata>');
  return o.join("");
}