table: Code breaking with webpack 2

I have upgrade my dependencies. It seems your code breaks around this line.

let visibleColumns = decoratedColumns.slice()
    let allVisibleColumns = []

    visibleColumns = visibleColumns.map((column, i) => {
      if (column.columns) {
        const visibleSubColumns = column.columns.filter(d => pivotBy.indexOf(d.id) > -1 ? false : _.getFirstDefined(d.show, true))
        return {
          ...column,
          columns: visibleSubColumns
        }
      }
      return column
    })