threshold
These modules are wrappers around the shamir library which abstract out some of the key generation and message integrity functions.
They're made for secret generation rather than splitting pre-existing material.
Usage
import {Signed} from './threshold';
const message: Uint8Array
// ...
// this function internally generates an ed25519 keypair.
const res = Signed.generate(3, 5, {message: message})
// res.publicKey == ed25519 key. Encrypt stuff with it.
// res.shards == signed, wrapped shares of the private key.
// ...
// generated public key is used to verify the shares.
const privKey = Signed.reconstruct(res.publicKey, [res.shards[0], res.shads[3], res.shards[1]])
// now you have the private key.