Function Stack

docs/tests/v2/es6/js/sanddance.js:111251–111253

* Stack layout for visualization elements. * @constructor * @param {object} params - The parameters for this operator. * @param {function(object): *} params.field - The value field to stack. * @param {Array } [params.groupby] - An array of accessors to groupby. * @param {fun

(params)

 */

function Stack(params) {
  _vegaDataflow.Transform.call(this, null, params);
}

Stack.Definition = {
  "type": "Stack",