Call only the fetcher with parameter

[danilockthar]

Im trying to use swr only with a fetcher and send one parameter to that fetcher, but it return undefined, how to do that correctly? I have this fetcher that connect to my fauna api and i want to send an ID parameter

export const productByID = async (id) => {
  const query = `query productByID($id: ID!){
    findProductByID(id: $id) {
        _id
       name
    }
  }`

  const res = await fetch(process.env.faunaDbGraphQlEndpoint, {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${process.env.faunaDbSecret}`,
      'Content-type': 'application/json',
      Accept: 'application/json',
    },
    body: JSON.stringify({
      query,
      variables: { id },
    }),
  })
  const {data:{findProductByID}} = await res.json()
  return { data: {findProductByID} }
}

const {data, errors }= useSWR([idproduct], productByID, { refreshInterval: 3000 })

[sergiodxa]

I think that should work, could you share a codesandbox to reproduce your error?