How to Mint Tokens

import { clusterApiUrl, Connection, PublicKey, Keypair } from "@solana/web3.js";
import {
  createAssociatedTokenAccountIdempotent,
  mintToChecked,
  TOKEN_2022_PROGRAM_ID
} from "@solana/spl-token";
import bs58 from "bs58";

(async () => {
  // connection
  const connection = new Connection(
    clusterApiUrl("http://127.0.0.1:8899"),
    "confirmed"
  );

  // 5YNmS1R9nNSCDzb5a7mMJ1dwK9uHeAAF4CmPEwKgVWr8
  const feePayer = Keypair.fromSecretKey(
    bs58.decode(
      "588FU4PktJWfGfxtzpAAXywSNt74AvtroVzGfKkVN1LwRuvHwKGr851uH8czM5qm4iqLbs1kKoMKtMJG4ATR7Ld2"
    )
  );

  // G2FAbFQPFa5qKXCetoFZQEvF9BVvCKbvUZvodpVidnoY
  const alice = Keypair.fromSecretKey(
    bs58.decode(
      "4NMwxzmYj2uvHuq8xoqhY8RXg63KSVJM1DXkpbmkUY7YQWuoyQgFnnzn6yo3CMnqZasnNPNuAT2TLwQsCaKkUddp"
    )
  );
  const airdropSig = await connection.requestAirdrop(
    feePayer.publicKey,
    1000000000
  );
  await connection.confirmTransaction(airdropSig);

  const mintPubkey = new PublicKey(
    "8mAKLjGGmjKTnmcXeyr3pr7iX13xXVjJJiL6RujDbSPV"
  );

  let tokenAccountPubkey = await createAssociatedTokenAccountIdempotent(
    connection, // connection
    feePayer, // fee payer
    mintPubkey, // mint
    feePayer.publicKey, // owner
    undefined,
    TOKEN_2022_PROGRAM_ID
  );
  console.log(`ATA: ${tokenAccountPubkey.toBase58()}`);

  {
    let txhash = await mintToChecked(
      connection, // connection
      feePayer, // fee payer
      mintPubkey, // mint
      tokenAccountPubkey, // receiver (should be a token account)
      feePayer, // mint authority
      1e9, // amount. if your decimals are 2, you mint 10^2 for 1 token.
      9, // decimals
      undefined,
      undefined,
      TOKEN_2022_PROGRAM_ID
    );
    console.log(`txhash: ${txhash}`);

    // if alice is a multisig account
    // let txhash = await mintToChecked(
    //   connection, // connection
    //   feePayer, // fee payer
    //   mintPubkey, // mint
    //   tokenAccountPubkey, // receiver (should be a token account)
    //   alice.publicKey, // !! mint authority pubkey !!
    //   1e8, // amount. if your decimals are 8, you mint 10^8 for 1 token.
    //   8, // decimals
    //   [signer1, signer2 ...],
    // );
  }
})();