convertPolyToPath.js

convertPolyToPath.js

var polys = document.querySelectorAll('polygon,polyline');
[].forEach.call(polys,convertPolyToPath);

function convertPolyToPath(poly){
  var svgNS = poly.ownerSVGElement.namespaceURI;
  var path = document.createElementNS(svgNS,'path');
  var points = poly.getAttribute('points').split(/\s+|,/);
  var x0=points.shift(), y0=points.shift();
  var pathdata = 'M'+x0+','+y0+'L'+points.join(' ');
  if (poly.tagName=='polygon') pathdata+='z';
  path.setAttribute('id',poly.getAttribute('id'));
  path.setAttribute('fill',poly.getAttribute('fill'));
  path.setAttribute('stroke',poly.getAttribute('stroke'));
  path.setAttribute('stroke-width',poly.getAttribute('stroke-width'));
  path.setAttribute('d',pathdata);

  poly.parentNode.replaceChild(path,poly);
}

Convert polyline to path in svg format

else on AI the trick to obtain path in the svg export is to turn the path in to a Compound Path (CMD + 8). That makes the SVG output an actual path rather than a primitive type.