@riqra/hierarchy-parser/dist/hierarchy-parser.esm.js

<p align="center"> <img src="https://res.cloudinary.com/riqra/image/upload/v1513825837/github/hierarchy-parser.svg" /> </p>

function _extends() {
  _extends = Object.assign || function (target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i];

      for (var key in source) {
        if (Object.prototype.hasOwnProperty.call(source, key)) {
          target[key] = source[key];
        }
      }
    }

    return target;
  };

  return _extends.apply(this, arguments);
}

var defaultOptions = {
  parentKey: 'parentId',
  identifier: 'id',
  initialParentId: null
};
function hierarchyParser(dataSource, options) {
  if (options === void 0) {
    options = {};
  }

  var _defaultOptions$optio = _extends({}, defaultOptions, options),
      parentKey = _defaultOptions$optio.parentKey,
      identifier = _defaultOptions$optio.identifier,
      initialParentId = _defaultOptions$optio.initialParentId;

  var initialParents;

  if (!initialParentId) {
    initialParents = dataSource.filter(function (item) {
      return item[parentKey] === null;
    });
  } else {
    initialParents = dataSource.filter(function (item) {
      return item[identifier] === initialParentId;
    });
  }

  function getChildren(parent) {
    return dataSource.filter(function (item) {
      return item[parentKey] === parent[identifier];
    });
  }

  function toHierarchyItem(parent) {
    var children = getChildren(parent);

    if (children.length === 0) {
      return parent;
    }

    return _extends({}, parent, {
      children: children.map(toHierarchyItem)
    });
  }

  return initialParents.map(toHierarchyItem);
}

export default hierarchyParser;
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