Object does'nt support property or method 'assign' Error IE11

[jamesleesaunders]

Browser: Internet Explorer 11.0.9600.19002
Error: Object doesn't support property or method 'assign'.

In the following function:

componentHeatMapRow () {
...
   // Add cells to series group
   seriesValues.map(function (el) {
             var o = Object.assign({}, el);     <---- here
             o.series = seriesName;
             return o;
           });
...
}

[jamesleesaunders]

See: https://stackoverflow.com/questions/35215360/getting-error-object-doesnt-support-property-or-method-assign

the Object.assign() method is not supported in IE

[jamesleesaunders]

https://babeljs.io/docs/plugins/transform-object-assign/