state.initialSeries.stack Boolean|String|Object
(default: false)
A boolean value indicating if the series should be stacked. A string value is interpreted as series.stack.group.
The
stack
options is supported when series.type is set to "bar", "column", or "line". All series in the stack must be of the same type.Stack settings of the first series are inherited as a default value by the rest of the series, in case they are not overridden.