changeCarOwner.ts

async changeCarOwner(stubHelper: StubHelper, args: string[]) {

        const verifiedArgs = await Helpers.checkArgs<{ key: string; owner: string }>(args, Yup.object()
            .shape({
                key: Yup.string().required(),
                owner: Yup.string().required(),
            }));

        let car = await <any>stubHelper.getStateAsObject(verifiedArgs.key);

        car.owner = verifiedArgs.owner;

        await stubHelper.putState(verifiedArgs.key, car);
}