Why do I get a TS2614 when import-destructure the default export of flatten-js library using ES module syntax but not when const-destructure it?

Question

I wish to improve the developer experience of the flatten-js library by fixing an issue I encountered with it.

When I do

import { point } from '@flatten-js/core';

I get a TS error that point doesn't exist but if I do

import Flatten from "@flatten-js/core";
const { point } = Flatten;

then point is recognized as a member of the library. I've documented the issue here. Anyone know what might be going on?