Named exports not available when importing from ESM

[bilby91]

When using ssh2 in an ESM context (Node.js with "type": "module" or .mjs files), named exports like Server are not available:

import { Server } from "ssh2";

Results in:

SyntaxError: Named export 'Server' not found. The requested module 'ssh2' is a CommonJS module, which may not support all module.exports as named exports.
CommonJS modules can always be imported via the default export, for example using:

import pkg from 'ssh2';
const { Server } = pkg;

Environment:

• Node.js v22.12.0
• ssh2 v1.16.0

Workaround:

Using default import with destructuring works:

import ssh2 from "ssh2";
const { Server } = ssh2;

Request:

Would it be possible to add explicit named exports to support ESM consumers? This would allow cleaner imports and better tree-shaking. Some approaches:

1. Add an ESM wrapper (exports field in package.json with ESM entry point)
2. Use a build tool to generate dual CJS/ESM outputs

Happy to help with a PR if there's interest.

[mscdex]

I'm not really interested in ESM, but the error you're receiving doesn't make much sense. module.exports is just assigned to an object with properties on it. Properties have names. Thus, I have no clue why node has a problem here.

[jeffrson]

ESM uses a more explicit export.

Instead of commonjs

module.exports.add = function(a, b) {
        return a + b;
}

ESM is

export function add(a, b) {
        return a + b;
}

The name of the property in module.exports is why it works by destructuring of default export.