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));

// Define our Turbin3 public key 
const to = new PublicKey("4gTWiPwC7AHdsu6BtySRd9KvEZVJmhQJRkB9rNH2P1Kj");

//Create a Solana devnet connection
const connection = new Connection("https://api.devnet.solana.com");


(async () => { 
    try { 
        // Get balance of dev wallet 
        const balance = await connection.getBalance(from.publicKey)

        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}`) 
    }})();