SES module emulation of CommonJS named exports

Considering the following case:

// exports.cjs
exports.name = 1;

// module-exports.cjs
module.default = 1;

// imports.mjs (or imports.js for node -r esm imports.js)
import exportsName from './exports.cjs';
import * as exportsNameStar from './exports.cjs';
import moduleExports from './module-exports.cjs';
import * as moduleExportsStar from './module-exports.cjs';
console.log({
  exportsName,
  exportsNameStar,
  moduleExports,
  moduleExportsStar,
});

Node.js 12:

(node:10205) ExperimentalWarning: The ESM module loader is experimental.
{
  exportsName: { name: 1 },
  exportsNameStar: [Module] { default: { name: 1 } },
  moduleExports: 1,
  moduleExportsStar: [Module] { default: 1 }
}

Node.js 14:

{
  exportsName: { name: 1 },
  exportsNameStar: [Module] { default: { name: 1 }, name: 1 },
  moduleExports: 1,
  moduleExportsStar: [Module] { default: 1 }
}

Node.js 16:

{
  exportsName: { name: 1 },
  exportsNameStar: [Module: null prototype] { default: { name: 1 }, name: 1 },
  moduleExports: 1,
  moduleExportsStar: [Module: null prototype] { default: 1 }
}

Node.js 16 node -r esm

{
  exportsName: { name: 1 },
  exportsNameStar: [Object: null prototype] [Module] { default: { name: 1 }, name: 1 },
  moduleExports: 1,
  moduleExportsStar: [Object: null prototype] [Module] { default: 1 }
}

SES does not yet implement all of these cases and should provide some consistent story, perhaps even a migration path from Node.js 14 to 16 semantics on a per-package basis.

[kriskowal]

The output above is verbatim from the Node.js console and I don’t know how to interpret that.

⚠️ Don’t get drawn into the nerd-snipe. I posted the issue so I could clear it out of my working copy and not think about it for a long time. 😉

[erights]

What does the square bracket notation above mean?

Such as [Object: null prototype] [Module] vs [Module: null prototype]

?