Cannot import from a Node.js ESM package

[relrelb]

Consider the following simple package:

package.json

{
    "type": "module",
    "dependencies": {
        "wasm-feature-detect": "^1.5.0"
    }
}

index.js

import { simd } from "wasm-feature-detect";
console.log(simd);

Running the following:

npm install
node index.js

Should've output:

[AsyncFunction: simd]

But instead the following error is produced:

file:///.../index.js:1
import { simd } from "wasm-feature-detect";
         ^^^^
SyntaxError: Named export 'simd' not found. The requested module 'wasm-feature-detect' is a CommonJS module, which may not support all module.exports as named exports.
CommonJS modules can always be imported via the default export, for example using:

import pkg from 'wasm-feature-detect';
const { simd } = pkg;

    at ModuleJob._instantiate (node:internal/modules/esm/module_job:123:21)
    at async ModuleJob.run (node:internal/modules/esm/module_job:189:5)

Node.js v19.6.1

I suspect the problem resides in the following line:

wasm-feature-detect/package.json

Line 6 in d5b2de2

 "module": "dist/esm/index.js", 

According to https://nodejs.org/api/packages.html#nodejs-packagejson-field-definitions, the "module" field doesn't even exist, but "exports" does. Applying the following patch fixes the problem:

-  "module": "dist/esm/index.js",
+  "exports": "./dist/esm/index.js",

[Surma]

Oh great catch. Thank you. I think the module field was never standard, but supported by bundlers. Anyway, whipping up a PR now