How to use the algosdk.Seed.encode function in algosdk

generateKeyPair(seed?: Buffer): KeyPair {
    const pair = seed ? generateAccountFromSeed(seed) : generateAccount();
    return {
      pub: pair.addr, // encoded pub
      prv: Seed.encode(pair.sk), // encoded seed
    };
  }

convertFromStellarSeed(seed: string): string | null {
    // assume this is a trust custodial seed if its a valid ed25519 prv
    if (!this.isStellarSeed(seed)) {
      return null;
    }
    return Seed.encode(stellar.StrKey.decodeEd25519SecretSeed(seed));
  }