Instantiating a script

Similar to contracts and predicates, once you've written a script in Sway and compiled it with forc build (read here 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 } from '@fuel-ts/program';
import { arrayify } from '@fuel-ts/utils';
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];
      }
    );
  });

See code in context

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