problem with highcharts-utils

[lourensm]

While trying to evaluate how highcharts-utils could help me, after fllowing the steps
in the README, I got stuck trying to start node ./bin/www:

import { jsToESM, htmlToESM } from '../public/javascripts/tools/jsfiddle-to-esm';
^^^^^^
SyntaxError: Cannot use import statement outside a module

any suggestions?
Thanks,
Lourens