Curry.js error when exporting a rescript function with more than 1 parameter using genType - node.js

Question

When exporting a function with more than 1 parameter (2 or more) it throws the following error, which basically says there is an issue with the way we import curry.js. I am attaching an example and package versions below.
Error:
Error [ERR_REQUIRE_ESM]: Must use import to load ES Module: path/to/node_modules/rescript/lib/es6/curry.js
require() of ES modules is not supported.
require() of /path/to/node_modules/rescript/lib/es6/curry.js from /path/to/src/demo.gen.ts is an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which defines all .js files in that package scope as ES modules.
Instead rename curry.js to end in .cjs, change the requiring code to use import(), or remove "type": "module" from /path/to/node_modules/rescript/lib/es6/package.json.
at new NodeError (node:internal/errors:329:5)
at Module._extensions..js (node:internal/modules/cjs/loader:1109:13)
at Object.require.extensions.<computed> [as .js] (/path/to/node_modules/ts-node/src/index.ts:851:44)
at Module.load (node:internal/modules/cjs/loader:972:32)
at Function.Module._load (node:internal/modules/cjs/loader:813:14)
at Module.require (node:internal/modules/cjs/loader:996:19)
at require (node:internal/modules/cjs/helpers:92:18)
at Object.<anonymous> (/path/to/src/demo.gen.ts:6:1)
at Module._compile (node:internal/modules/cjs/loader:1092:14)
at Module.m._compile (/path/to/node_modules/ts-node/src/index.ts:858:23)
Example
demo.res
#genType
let helloWord = (firstName: string, lastName: string): unit => {
Js.log("Hello " ++ firstName ++ " " ++ lastName)
}
demo.bs.js
// Generated by ReScript, PLEASE EDIT WITH CARE
'use strict';
function helloWord(firstName, lastName) {
console.log("Hello " + firstName + " " + lastName);
}
exports.helloWord = helloWord;
/* No side effect */
demo.gen.ts
/* TypeScript file generated from demo.res by genType. */
/* eslint-disable import/first */
// #ts-ignore: Implicit any on import
import * as Curry__Es6Import from 'rescript/lib/es6/curry.js';
const Curry: any = Curry__Es6Import;
// #ts-ignore: Implicit any on import
import * as demoBS__Es6Import from './demo.bs';
const demoBS: any = demoBS__Es6Import;
export const helloWord: (firstName:string, lastName:string) => void = function (Arg1: any, Arg2: any) {
const result = Curry._2(demoBS.helloWord, Arg1, Arg2);
return result
};
package.json
{
"ts-node": "^10.2.1",
"gentype": "^4.1.0",
"rescript": "^9.1.4",
"typescript": "^3.9.6"
}
Node Version
$ node -v
v15.11.0
OS
Manjaro Linux

Answer 1

After taking a look at this file in genType: https://github.com/rescript-association/genType/blob/fb6201266558a64d62441f7ac0d8d6652456397a/src/Config_.ml
I found this option
{
"gentypeconfig": {
"module": "commonjs",
}
}
setting that solves the issue :D
I could not found it anywhere else in rescript docs unfortunately :(