How to Restore a Keypair from a Mnemonic

import { createKeyPairSignerFromPrivateKeyBytes } from "@solana/kit";
import * as bip39 from "bip39";

const mnemonic =
  "pill tomorrow foster begin walnut borrow virtual kick shift mutual shoe scatter";
const seed = bip39.mnemonicToSeedSync(mnemonic, "");

// Extract the first 32 bytes for the private key
const privateKeyBytes = seed.subarray(0, 32);

const signer = await createKeyPairSignerFromPrivateKeyBytes(
  new Uint8Array(privateKeyBytes)
);

console.log(signer.address);

import { HDKey } from "micro-ed25519-hdkey";
import * as bip39 from "bip39";
import { createKeyPairSignerFromPrivateKeyBytes } from "@solana/kit";

const mnemonic =
  "neither lonely flavor argue grass remind eye tag avocado spot unusual intact";
const seed = bip39.mnemonicToSeedSync(mnemonic);
const hd = HDKey.fromMasterSeed(seed.toString("hex"));

for (let i = 0; i < 10; i++) {
  const path = `m/44'/501'/${i}'/0'`;
  const child = hd.derive(path);

  const signer = await createKeyPairSignerFromPrivateKeyBytes(
    new Uint8Array(child.privateKey)
  );
  // The signer object has the address directly
  console.log(`${path} => ${signer.address}`);
}