Since bpmn-moddle v10, you can no longer use a default import but must now use a named import like so:

// Broken since updating to v10
import BpmnModdle from 'bpmn-moddle';

// You must now do this
import { BpmnModdle } from 'bpmn-moddle';

I could not come up with a .d.ts file hack to work around this, so it seems like something that must be fixed in DefinitelyTyped instead.

I think the index.d.cts is also not needed anymore because of this change, because the package now only ships an ES module.