How do createSchemaCustomization/createResolvers know where to look for files?

[thammarith]

Hi, I'm following this Using Type Definitions example.

I understand most of them but I don't understand how it can find the author.json, blog.json, comment.jsonfiles?

I know that they are resolved with this configuration in the gatsby-config.jsfile.

{
      resolve: `gatsby-source-filesystem`,
      options: {
        name: `data`,
        path: `./src/data/`,
      },
 }

However, what I don't get is on what line on the gatsby-node.js, it uses the results from gatsby-source-filesystem to source the data?

Let's say that instead of the file named author.json, I want to source the data from the file named writer.json instead but the GraphQL type is still AuthorJson (or simply Author without Json). How can I achieve that?

Thanks!

[thammarith]

Ok, I figured it out. It comes from gatsby-transformer-json's configuration.