Multiple interpolation of same fragment

[eknkc]

Hi,

While trying to switch to the transformer I've ran into an issue; say:

const a = gql`
  fragment a on A {
    id
  }
`

const b = gql`
  fragment b on B {
    id
    child {
      ...a 
    } 
  } 
  ${a}
`

const c = gql`
  fragment c on C {
    id
    childA { ...a }
    childB { ...b }
  }
  ${a}
  ${b}
`

Now the c fragment basically embeds a twice. Once itself, once via b. graphql-tag handles this on runtime and does not embed the duplicate. However the compile time transformation follows a twice. Causing a query error.

I'm not familiar with the ts visitor api but I guess it could be possible to find duplicate references in a single interpolation tree and skip duplicates. Is it possible or does it require some runtime knowledge?

Thanks!

[firede]

This requires the context of interpolation.
Regrettably, I have no free time to do this improvement recently :(
I marked the issue as help wanted and kept it open.

[eltonio450]

seems related to apollographql/graphql-tag#278