npm do not export dist files

[kalwalt]

trying to setup a minimal example with a npm package.json, when you install the packages with all fine, but when you try to import you get a message:

Failed to resolve import "arjsCore" from "main.js". Does the file exist?
D:/kalwalt-github/arjs-plugin-threejs/examples/minimal/main.js:11:8
9  |          webcamPlugin,
10 |          defaultProfilePlugin,
11 |  } from 'arjsCore';

if you look at the node_modules pkg it lacks of dist folder.