ASP .NET Core React Grid

I built a default ASP .NET Core Web Application with React support enabled.

This built and ran.

I then used the example from the Kendo React Grid - https://www.telerik.com/kendo-react-ui/components/grid/

to add a Grid to the example code, replacing a table.

If I run the sample in IE 11 I get an exception in the following function :

export function registerForLocalization(component) {
    var ctx = {
        kendoLocalizationService: PropTypes.object
    };
    if (component.contextTypes) {
        Object.assign(component.contextTypes, ctx);   <<<<<<<<<<<<<<<<<<<< unsupported in IE
    }
    else {
        component.contextTypes = ctx;
    }

This seems to be because the Object.assign function is not supported in IE.

If I run in Edge or Chrome, the page loads, then it quickly fills the page with Error messages such as :

ERROR in [at-loader] ..\..\..\node_modules\@types\prop-types\index.d.ts:10:38 TS1005: '=' expected.
ERROR in [at-loader] ..\..\..\node_modules\@types\prop-types\index.d.ts:12:46 TS1005: ';' expected.
ERROR in [at-loader] ..\..\..\node_modules\@types\prop-types\index.d.ts:12:75 TS1005: ';' expected.
ERROR in [at-loader] ..\..\..\node_modules\@types\prop-types\index.d.ts:12:99 TS1005: ';' expected.
ERROR in [at-loader] ..\..\..\node_modules\@types\prop-types\index.d.ts:14:54 TS1005: ';' expected.
ERROR in [at-loader] ..\..\..\node_modules\@types\prop-types\index.d.ts:14:78 TS1005: ';' expected.
ERROR in [at-loader] ..\..\..\node_modules\@types\prop-types\index.d.ts:14:81 TS1109: Expression expected.
ERROR in [at-loader] ..\..\..\node_modules\@types\prop-types\index.d.ts:14:97 TS1109: Expression expected.
ERROR in [at-loader] ..\..\..\node_modules\@types\prop-types\index.d.ts:14:122

Any ideas how to resolve either of these issues ?

Is there a working example of using the controls with ASP .NET Code Web in React ?

Thanks,

Dave