Invalid ESM builds

[toteto]

While trying to use the @iden3 set of packages, core, crypto and merkletree, faced an issue with their ESM deliveries while trying to use in my ESM module.

Reproduction steps:

1. Create new project
2. Set the "type": "module" property in project.json
3. Import @iden3/js-iden3-core in index.js

Repository: https://github.com/toteto/iden3-invalid-build

➜  iden3-invalid-build node .
(node:73502) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
(Use `node --trace-warnings ...` to show where the warning was created)
/Users/antonioivanovski/dev/iden3-invalid-build/node_modules/@iden3/js-iden3-core/dist/node/esm/index.js:1
export * from './claim';
^^^^^^

SyntaxError: Unexpected token 'export'
    at internalCompileFunction (node:internal/vm:77:18)
    at wrapSafe (node:internal/modules/cjs/loader:1288:20)
    at Module._compile (node:internal/modules/cjs/loader:1340:27)
    at Module._extensions..js (node:internal/modules/cjs/loader:1435:10)
    at Module.load (node:internal/modules/cjs/loader:1207:32)
    at Module._load (node:internal/modules/cjs/loader:1023:12)
    at cjsLoader (node:internal/modules/esm/translators:356:17)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:305:7)
    at ModuleJob.run (node:internal/modules/esm/module_job:218:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:329:24)

Node.js v20.11.0

Issues:

• The package.json is not marked as ESM module ("type": "module"), causing the file resolution to require .mjs extension of JS files. This is documented at: https://nodejs.org/api/esm.html#enabling
• The import/export statements require mandatory file extensions, instead of export * from './claim'; it needs to be export * from './claim.js';. This is documented at: https://nodejs.org/api/esm.html#import-specifiers
• The import of json document requires specifying import attributes of with { type: 'json' }. Documented at: https://nodejs.org/api/esm.html#import-attributes

Workaround:
Currently using pnpm patch to patch the builds with fixes for the above mentioned issues. I have put all patches at: https://gist.github.com/toteto/f071db1a0495b426efbd2390a34790cf