Transfer SOL

import { createClient, generateKeyPairSigner, lamports } from "@solana/kit";
import { litesvm } from "@solana/kit-plugin-litesvm";
import { signer } from "@solana/kit-plugin-signer";
import { systemProgram } from "@solana-program/system";

// Payer first, then the LiteSVM transport, then program plugins.
const mySigner = await generateKeyPairSigner();
const client = createClient()
  .use(signer(mySigner))
  .use(litesvm())
  .use(systemProgram());
const recipient = await generateKeyPairSigner();

// Airdrop SOL to the payer
client.svm.airdrop(client.payer.address, lamports(10_000_000_000n));

// Check initial balance
const senderInitial = client.svm.getBalance(client.payer.address) ?? 0n;
console.log("Sender initial:", Number(senderInitial) / 1e9, "SOL");

// Build and send the transfer
await client.system.instructions
  .transferSol({
    source: client.payer,
    destination: recipient.address,
    amount: lamports(1_000_000_000n) // 1 SOL
  })
  .sendTransaction();

// Check final balances
const senderFinal = client.svm.getBalance(client.payer.address) ?? 0n;
const recipientFinal = client.svm.getBalance(recipient.address) ?? 0n;
console.log("Sender final:", Number(senderFinal) / 1e9, "SOL");
console.log("Recipient final:", Number(recipientFinal) / 1e9, "SOL");

Sender initial: 10 SOL
Sender final: 8.999995 SOL
Recipient final: 1 SOL