Error on private npm class

[mike-rivera]

I created the following gist to simulate my problem. https://gist.github.com/mike-rivera/5838b9c2d25d14e234648349ed0c1ee2

I created an npm package using ESM that comes from a local npm registry and I have the following:

package

• index.js - ESM invoker
• main.js - a simple class written in ES6,
• example package.json for the package

client

• script that consumes the package.
• example package.json of the client script

When I run the script I get the following error on line 3 of my-client-script

TypeError: MyClass is not a constructor

if I install esm on the the client script to it works. This is a concern since not all of my clients applications will have esm installed.

[jsg2021]

esm will need to be listed as a dependency in your library. not a devDependency.