location props in gatsby is not defined

I am trying to use location props in my gastby page :
I am passing props in my Link in
pages/index.js:

 <Link state={{eventID: event.id}}  to={`/date/${event.name}`}>
  </Link>

pages/date/[dateId]/index.js:

const DateWithId = ({location},props) => {
    const { state = {} } = location
    const { eventID} = state
...}

eventually I get an error Parsing error: Identifier ‘location’ has already been declareded :