help with hook extension

[grim geyser]

Hi I am strugglin gwith API extensions, I am getting super confusing errors about ES / common js syntax.
All I need to do is make the simple example in the docs work:

export default ({ filter }, { exceptions }) => {
const { InvalidPayloadException } = exceptions;

filter('items.create', async (input) => {
    if (LOGIC_TO_CANCEL_EVENT) {
        throw new InvalidPayloadException(WHAT_IS_WRONG);
    }

    return input;
});

};

[clear reef]

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[grim geyser]

I tried using cjs syntax, even renaming the extension ... so lost