example.SLIP39.js

const slip39 = require('slip39');

const original = 'Secret Message Here';

const shares = splitSLIP39(original);
console.log('Shares', shares);

const recoverd = recoverSLIP39([shares[1], shares[0]]); // pick any two to recover
console.log(recoverd);

function splitSLIP39(str, threashold = {need: 2, from: 3}){
    const slip = slip39.fromArray(str.slip39EncodeHex(), {
        passphrase: '',
        groups: [
            [threashold.need, threashold.from]
        ]
    });
    return slip.fromPath('r/0').children.map(i=>i.mnemonic);
}

function recoverSLIP39(shares){
    return slip39.recoverSecret(shares, '').slip39DecodeHex();
}