concord-consortium/rigse

// from https://stackoverflow.com/questions/979975/
const parseQueryString = function (queryString?: any) {
  if (queryString == null) {
    queryString = window.location.search.replace(/^\?/, "");
  }
  const vars = queryString.split("&");
  const params: any = {};
  for (let i = 0; i < vars.length; i++) {
    const pair = vars[i].split("=");
    // If first entry with this name
    if (typeof params[pair[0]] === "undefined") {
      params[pair[0]] = decodeURIComponent(pair[1]);
      // If second entry with this name
    } else if (typeof params[pair[0]] === "string") {
      const arr = [params[pair[0]], decodeURIComponent(pair[1])];
      params[pair[0]] = arr;
      // If third or later entry with this name
    } else {
      params[pair[0]].push(decodeURIComponent(pair[1]));
    }
  }
  return params;
};

export default parseQueryString;