ESM modules not recognised as ESM by Node

[denyeo]

Thanks for the very promising library. When running a Node server (20.3.1 and other versions), it seems like the ESM modules aren't recognised as ESM by Node:

import { CborEncoderFast } from 'json-joy/esm/json-pack/cbor/CborEncoderFast';
         ^^^^^^^^^^^^^^^
SyntaxError: Named export 'CborEncoderFast' not found.
The requested module 'json-joy/esm/json-pack/cbor/CborEncoderFast' is a
CommonJS module, which may not support all module.exports as named exports.

~~I assume CborEncoderFast.js is indeed a valid ESM module (could someone verify?), which means Node is identifying it wrongly for some reason.~~ This seems to be because Node requires the nearest package.json to contain "type": "module" for it to interpret .js files as modules. Since json-joy contains multiple module formats, it seems like specifying a single module type for the whole repo isn't going to work.

edit: I added a package.json containing { "type": "module" } to the esm folder, and it works now.

(An alternative is to name the ESM files with .mjs to indicate they're ESM, if that's possibly better for other scenarios.)

[streamich]

Thanks, the build output will be improved in the future, but currently it is best just to use it CommonJS-way.