transfer.ts

import { Transaction, SystemProgram, Connection, Keypair,
  LAMPORTS_PER_SOL, sendAndConfirmTransaction, PublicKey } from
  '@solana/web3.js'

import wallet from './dev-wallet.json'

const from = Keypair.fromSecretKey(new Uint8Array(wallet.wallet))
const to = new PublicKey('52K6pXGoKFvWE64vyXxVFrYhCcz2jtWPmKTaczXRAgau')
const connection = new Connection("https://api.devnet.solana.com");

(async () => {
  try {
      // Get balance of dev wallet
      const balance = await connection.getBalance(from.publicKey)
      // Create a test transaction to calculate fees
      const transaction = new Transaction().add(
          SystemProgram.transfer({
              fromPubkey: from.publicKey,
              toPubkey: to,
              lamports: balance,
}) );
      transaction.recentBlockhash = (await
connection.getLatestBlockhash('confirmed')).blockhash;
      transaction.feePayer = from.publicKey;
      // Calculate exact fee rate to transfer entire SOL amount out of account minus fees
const fee = (await
connection.getFeeForMessage(transaction.compileMessage(),
'confirmed')).value || 0;
      // Remove our transfer instruction to replace it
      transaction.instructions.pop();
      // Now add the instruction back with correct amount of lamports
      transaction.add(
          SystemProgram.transfer({
              fromPubkey: from.publicKey,
              toPubkey: to,
              lamports: balance - fee,
}) );
      // Sign transaction, broadcast, and confirm
      const signature = await sendAndConfirmTransaction(
          connection,
          transaction,
          [from]
      );
      console.log(`Success! Check out your TX here:
      https://explorer.solana.com/tx/${signature}?cluster=devnet`)
  } catch(e) {
      console.error(`Oops, something went wrong: ${e}`)
} })();