snarkjs cannot be used with ES modules

[cedoor]

Description

snarkjs cannot be used with ES modules as some iden3 packages depend on web-worker@1.3.0, which for some reason doesn't include type: "module" in its package.json (and exports its ES modules with .js instead of .mjs). Related issue: developit/web-worker#44.

Here are the dependencies that cause this problem:

• r1csfile@0.0.47 -> ffjavascript@0.2.60 -> web-worker@^1.2.0
• circom_runtime@0.1.24 -> ffjavascript@0.2.60 -> web-worker@^1.2.0

web-worker@1.2.0 works fine but ^ makes package managers (Yarn for sure) to download the latest minor, i.e. v1.3.0.

ffjavascript@0.2.63 seems to fix it by using a fixed version (precisely v1.2.0) and r1csfile and circom_runtime on Github seem to depend on ffjavascript@0.2.63, but their latest version was actually released with ffjavascript@0.2.60, as you can check on NPM:

• https://www.npmjs.com/package/circom_runtime?activeTab=code
• https://www.npmjs.com/package/r1csfile?activeTab=code

I guess 1 solution here is just to release a new version of r1csfile and circom_runtime first, and then a new version of snarkjs with those dependencies updated.

Example

index.js:

import { groth16 } from "snarkjs"

console.log(groth16)

package.json:

{
    "type": "module",
    "dependencies": {
        "snarkjs": "^0.7.3"
    }
}

Error

(node:30967) 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)
/home/cedoor/Downloads/tests/snarkjs/node_modules/circom_runtime/node_modules/web-worker/node.js:17
import URL from 'url';
^^^^^^

SyntaxError: Cannot use import statement outside a module
    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:345:17)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/translators:294:7)
    at ModuleJob.run (node:internal/modules/esm/module_job:218:25)
    at async ModuleLoader.import (node:internal/modules/esm/loader:329:24)

Node.js v20.10.0

Other information:

Using Yarn v4.1.0 and NodeJS v20.10.0.