Fuels-ts

Appearance

Generate Fake Resources ​

When working with an unfunded account, you can generate fake resources to perform a dry-run on your transactions. This is useful for testing purposes without the need for real funds.

Below is an example script that returns the value 1337. You can use fake resources to execute a dry-run of this script and obtain the returned value.

rust
script;

fn main() -> u64 {
    return 1337;
}
See code in context

To execute a dry-run, use the Provider.dryRun method. Ensure you set the utxo_validation flag to true, as this script uses fake UTXOs:

ts
import type { TransactionResultReturnDataReceipt } from 'fuels';
import {
  bn,
  Provider,
  ReceiptType,
  ScriptTransactionRequest,
  Wallet,
} from 'fuels';

import { LOCAL_NETWORK_URL, WALLET_PVT_KEY } from '../env';
import { ReturnScript } from '../typegend';

const provider = await Provider.create(LOCAL_NETWORK_URL);
const wallet = Wallet.fromPrivateKey(WALLET_PVT_KEY, provider);

const baseAssetId = provider.getBaseAssetId();

const transactionRequest = new ScriptTransactionRequest({
  gasLimit: bn(62_000),
  maxFee: bn(60_000),
  script: ReturnScript.bytecode,
});

const resources = wallet.generateFakeResources([
  {
    amount: bn(100_000),
    assetId: baseAssetId,
  },
]);

transactionRequest.addResources(resources);

const dryrunResult = await provider.dryRun(transactionRequest);

const returnReceipt = dryrunResult.receipts.find(
  (receipt) => receipt.type === ReceiptType.ReturnData
) as TransactionResultReturnDataReceipt;

const { data: returnedValue } = returnReceipt;
See code in context

By setting utxo_validation to true, you can successfully execute the dry-run and retrieve the returned value from the script without requiring actual funds.