Using cardano-serialization-lib

Developers Cardano Integration
1

I’m trying to write a program to use the key derivation mechanism.
I found the cardano-serialization-lib (GitHub - Emurgo/cardano-serialization-lib: This is a library, written in Rust, for serialization & deserialization of data structures used in Cardano's Haskell implementation of Alonzo along with useful utility functions.), which already implements most functions for me, but struggle to get it working.

I installed the package via npm:
npm install cardano-serialization-lib

When trying to run this code:

import pkg from 'bip39';
const {mnemonicToEntropy } = pkg;

import  CardanoWasm  from 'cardano-serialization-lib';

const entropy = mnemonicToEntropy(
  [ "test", "walk", "nut", "penalty", "hip", "pave", "soap", "entry", "language", "right", "filter", "choice" ].join(' ')
);

const rootKey = CardanoWasm.Bip32PrivateKey.from_bip39_entropy(
  Buffer.from(entropy, 'hex'),
  Buffer.from(''),
);

I get this error:

(node:20133) ExperimentalWarning: The ESM module loader is experimental.
internal/modules/run_main.js:54
    internalBinding('errors').triggerUncaughtException(
                              ^

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string or an instance of URL. Received undefined
    at fileURLToPath (internal/url.js:1352:11)
    at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:780:21)
    at Loader.resolve (internal/modules/esm/loader.js:97:40)
    at Loader.getModuleJob (internal/modules/esm/loader.js:243:28)
    at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:46:40)
    at link (internal/modules/esm/module_job.js:45:36) {
  code: 'ERR_INVALID_ARG_TYPE'
}

I’m guessing the path to the Rust library is not properly linked, but I’m nor really sure.

Any help is appreciated. Thank you. :slight_smile:

2

Okay, I already could solve it myself.

I set the path variable:
nano .profile
Add this at the end:
export PATH=$HOME/.cargo/bin/:$PATH
Then execute:
source .profile

Also I was using the wrong library:
import CardanoWasm from '@emurgo/cardano-serialization-lib-nodejs'

This fixed the problem for me.