I’m seeing this node error:
~> rescript
~> node lib/es6/src/Set/Set.bs.js
(node:40746) 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/stu/tmp/rescript/learn/node_modules/@rescript/core/lib/es6/src/Core__List.bs.js:3
import * as Curry from "rescript/lib/es6/curry.js";
^^^^^^
SyntaxError: Cannot use import statement outside a module
at internalCompileFunction (node:internal/vm:73:18)
at wrapSafe (node:internal/modules/cjs/loader:1166:20)
at Module._compile (node:internal/modules/cjs/loader:1210:27)
at Module._extensions..js (node:internal/modules/cjs/loader:1300:10)
at Module.load (node:internal/modules/cjs/loader:1103:32)
at Module._load (node:internal/modules/cjs/loader:942:12)
at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:168:29)
at ModuleJob.run (node:internal/modules/esm/module_job:193:25)
Node.js v19.5.0
It’s from this (admittedly clumsy, just for learning purposes) ReScript module:
module type Set = {
type set<'e>
let empty: unit => set<'e>
let singleton: 'e => set<'e>
let size: set<'e> => int
}
module ArraySet: Set = {
type set<'e> = array<'e>
let empty = () => []
let singleton = x => [x]
let size = xs => Array.length(xs)
}
let aset_1 = ArraySet.singleton(42)
Console.log(aset_1)
module ListSet: Set = {
type set<'e> = list<'e>
let empty = () => list{}
let singleton = x => list{x}
let size = xs => List.length(xs)
}
let lset_1 = ListSet.singleton(42)
Console.log(lset_1)
module type SetLaws = {
type set<'a>
let singleton_size: 'a => bool
}
module SetLawsFor = (S: Set): SetLaws => {
type set<'a> = S.set<'a>
let singleton_size = x =>
S.size(S.singleton(x)) == 1
}
module ArraySetLaws = SetLawsFor(ArraySet)
Console.log(ArraySetLaws.singleton_size(42))
module ListSetLaws = SetLawsFor(ListSet)
Console.log(ListSetLaws.singleton_size(42))
Any advice much appreciated.
