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Instantiating a Script

Icon LinkInstantiating a script

Similar to contracts and predicates, once you've written a script in Sway and compiled it with forc build (read here Icon Link for more on how to work with Sway), you'll get the script binary. Using the binary, you can instantiate a script as shown in the code snippet below:

// #import { ScriptRequest, arrayify };
const scriptBin = readFileSync(join(__dirname, './path/to/script-binary.bin'));
 
type MyStruct = {
  arg_one: boolean;
  arg_two: BigNumberish;
};
 
/**
 * @group node
 */
describe('Script', () => {
  let scriptRequest: ScriptRequest<MyStruct, MyStruct>;
  beforeAll(() => {
    const abiInterface = new Interface(scriptJsonAbi);
    scriptRequest = new ScriptRequest(
      scriptBin,
      (myStruct: MyStruct) => {
        const encoded = abiInterface.functions.main.encodeArguments([myStruct]);
 
        return arrayify(encoded);
      },
      (scriptResult) => {
        if (scriptResult.returnReceipt.type === ReceiptType.Revert) {
          throw new Error('Reverted');
        }
        if (scriptResult.returnReceipt.type !== ReceiptType.ReturnData) {
          throw new Error('fail');
        }
 
        const decoded = abiInterface.functions.main.decodeOutput(scriptResult.returnReceipt.data);
        return (decoded as any)[0];
      }
    );
  });

In the next section , we show how to run a script.