Add comments type to GraphQL

[eshlox]

The theme allows us to add comments: false to the frontmatter to disable comments for the article.

comments: false

The theme should create a comments type for GraphQL in case there is no article with the comment option, otherwise, it won't work.

I wanted to add this to gatsby-node.js:

exports.createSchemaCustomization = ({ actions, schema }) => {
  const { createTypes, createFieldExtension } = actions;

  createFieldExtension({
    name: `defaultTrue`,
    extend() {
      return {
        resolve(source, args, context, info) {
          if (source[info.fieldName] == null) {
            return true;
          }
          return source[info.fieldName];
        }
      };
    }
  });

  createTypes(`
    type MdxFrontmatter @infer {
      comments: Boolean @defaultTrue
    }
    type Mdx implements Node @infer {
      frontmatter: MdxFrontmatter
    }
  `);
};

but it does not create a new type.

I see these warnings during the build process:

warn Plugin `gatsby-plugin-mdx` tried to define the GraphQL type `MdxFrontmatter`, which has already been defined by the plugin `@eshlox/gatsby-theme-axii`.
warn Plugin `gatsby-plugin-mdx` tried to define the GraphQL type `Mdx`, which has already been defined by the plugin `@eshlox/gatsby-theme-axii`.

• Allow themes to modify existing GraphQL types gatsbyjs/gatsby#15544
• Clarify GraphQL type ownership and permissions for themes gatsbyjs/gatsby#16529

Maybe there is another/better way?