Function buildPath

lib/helpers/formDataToJSON.js:70–104

(path, value, target, index)

 */
function formDataToJSON(formData) {
  function buildPath(path, value, target, index) {
    throwIfDepthExceeded(index);

    let name = path[index++];

    if (name === '__proto__') return true;

    const isNumericKey = Number.isFinite(+name);
    const isLast = index >= path.length;
    name = !name && utils.isArray(target) ? target.length : name;

    if (isLast) {
      if (utils.hasOwnProp(target, name)) {
        target[name] = utils.isArray(target[name])
          ? target[name].concat(value)
          : [target[name], value];
      } else {
        target[name] = value;
      }

      return !isNumericKey;
    }

    if (!utils.hasOwnProp(target, name) || !utils.isObject(target[name])) {
      target[name] = [];
    }

    const result = buildPath(path, value, target[name], index);

    if (result && utils.isArray(target[name])) {
      target[name] = arrayToObject(target[name]);
    }

    return !isNumericKey;
  }

  if (utils.isFormData(formData) && utils.isFunction(formData.entries)) {
    const obj = {};