Gatsby fragments

Generates *.fragment.ts files from *.gql files to use a vendor prefix.

This is necessary to execute equivalent GraphQL queries on the backend (Drupal) and the frontend (Gatsby) for use cases like instant preview.

Execute one time

npx @amazeelabs/gatsby-fragments generate --path "path/to/fragment-files"

Setup on a project

1. Decide which fragments should be used by both backend and frontend (typically: content types, media, ...)
2. Move these fragments in a dedicated directory, e.g. src/fragments/commons
3. Convert possibly existing Gatsby GraphQL Drupal .ts fragment files to vendor agnostic .gql files
4. Gitignore the generated *.fragment.ts files from this common directory
5. Setup the generate fragments script in Gatsby package.json. Example: "generate-fragments": "node gatsby-fragments generate --path './src/fragments/commons' && eslint \"./src/fragments/commons/**/*.fragment.ts\" --fix && prettier --write \"./src/fragments/commons/**/*.fragment.ts\"",
6. This script could be added to the codegen one, but it needs to be executed first, so generated fragments can then be used by codegen. Example: "codegen": "pnpm generate-fragments && graphql-codegen --config codegen.yml"
7. Fragments in the common directory can now be executed by both Gatsby and Drupal GraphQL

Step 3. example:

Sample existing Drupal Gatsby specific fragment

import { graphql } from 'gatsby';

export const fragment = graphql`
  fragment ContentPage on DrupalContentPage {
    __typename
    drupalId
    langcode
    title
    articleReference {
      ... on DrupalContentArticle {
        drupalId
        langcode
        title
      }
    }
  }
`;

Becomes GraphQL vendor agnostic

fragment ContentPage on ContentPage {
  __typename
  drupalId
  langcode
  title
  articleReference {
    ... on ContentArticle {
      drupalId
      langcode
      title
    }
  }
}

After generate, the initial file will be set back to the original version with __typename replaced by __typename:_original_typename.

Development

To manually test on sample fragments.

pnpm ./cli.cjs generate --path ./tests/fragments