This plugin adds a route field to WP GraphQL to get post data via URL path.

Usage:

route(path: "/about-page") {
    __typename
    
    ... on Post {
      title
      content
      post_specific_field
    }
    
    ... on Page {
      title
      content
      page_specific_field
    }
  } 

Returns:

{
  "data": {
    "route": {
      "__typename": "Page",
      "title": "About page",
      "content": "\n<p>this is the about page</p>\n",
      "page_specific_field": "Yep, this is a page alright"
    }
  }
}

URL rewrites for custom post types are respected because this plugin gets data by path, not uri. TeamMember is a custom post type called "team_members" which is rewritten to "team" and has a WP GraphQL singular name of TeamMember.

route(path: "/team/tyler/") {
    ... on TeamMember {
      title
      content
    }
  }

Feel free to add slashes to the path at the beginning and end or leave them out. /team/tyler/, /team/tyler, team/tyler all work.