For any path having no stroke value but having a fill value, set the stroke value to the fill value

svg-fill-to-stroke-color.js

(function() {
  var count = 0;
  var i = 0;
  var fill;
  var path;
  var paths = document.getElementsByTagName('path');
  var pathsLen = paths.length;
  var stroke;

  while (i < pathsLen) {
    path = paths[i];

    fill = path.getAttribute('fill');
    stroke = path.getAttribute('stroke');

    if (fill && !stroke) {
      console.info('Setting stroke color to fill color @path:' + i);
      count++;

      path.setAttribute('stroke', fill);
      path.setAttribute('stroke-width', '1.25');
    }

    i++;
  }

  console.info('Modified ' + count + ' of ' + pathsLen + ' paths');
})();