gatsby-source-graphql and File System Route API

[tglenister]

We're trying to use the File System Route API on a GraphQL endpoint we are accessing through the gatsby-source-graphql plugin. The queries are only available in the schema under the fieldName we defined in gatsby-config, and we're trying to figure out where we can create the nodes so that they are available to the File System Route API. Our schema comes in like

{
  customSource {
    articles
    authors
    videos
  }
}

so to access the data in the File System Route API we need to create nodes so it is shaped like allArticles, allAuthors, allVideos. If anyone can point us in the right direction, we'd be very grateful. Thanks!