Graphql-code-generator: Invalid opertation fragment union types as of 1.6.0

[jefflewis]

Describe the bug
In 1.5.0, a query that includes a fragment generates a fragment type based on the selections of the fragment.

In 1.6.0, that same query generates only { "__typename": MyType }, regardless of what is in the selection.

To Reproduce
Generate from schema with schema

fragment PriceFragment on Price {
  id
  item {
    ... on Product {
      ...ProductFragment
  }
}

...where ProductFragment is included and contains product selections (e.g. id and name).

1. My GraphQL schema:
   Unable to full schema.

2. My GraphQL operations:
   This is not tied to a specfic operation, but the fragment types used in them.

3. My codegen.yml config file:

overwrite: true
schema: schema.graphql
documents:
  [
    src/graphql/queries/**/*.graphql,
    src/graphql/fragments/**/*.graphql,
    src/graphql/mutations/**/*.graphql,
    src/graphql/subscriptions/**/*.graphql,
  ]
generates:
  src/components/graphql.tsx:
    # hooks:
    #   afterOneFileWrite:
    #     - prettier --write
    plugins:
      - typescript
      - typescript-operations
      - typescript-react-apollo
      - fragment-matcher
    config:
      namingConvention: keep
      withHOC: false
      withHooks: true
      withComponent: true
      typesPrefix: I
      nonOptionalTypename: true
      avoidOptionals: false
      preResolveTypes: false
      dedupeOperationSuffix: true
      scalars:
        Money: number
        MoneyInput: number | string
        Decimal: number
        DecimalInput: number | string
        DateTime: string
        Date: string
  ./graphql.schema.json:
    plugins:
      - introspection

Expected behavior

export type IPriceFragment = { __typename: "Price" } & Pick<IPrice, "id"> & { item: ({ __typename: "Product" } & IProductFragment) }

Environment:

• OS:
• @graphql-codegen/1.6.1:
• NodeJS: 10.14.0

** Additional Notes
The schema is generated without "errors", but the generated output is not as expected. Reverting to 1.5.0 from 1.6.0 or 1.6.1 restores the expected state of the fragments.

[dotansimha]

@n1ru4l is it related to your recent changes?

[n1ru4l]

Might be, @jefflewis: Can you please provide a minimal reproduction? Either a CodeSandbox or a Git Repository is fine. Is hard to guess what's wrong without having the schema.

Edit:

See https://github.com/dotansimha/graphql-code-generator/pull/2409 for reproduction.

[n1ru4l]

Should be fixed by https://github.com/dotansimha/graphql-code-generator/pull/2409

Sorry for the inconveniences!

[dotansimha]

Fixed in 1.7.0