typeMap.js

// Simplified structure of the type map
let typeMap = {
  rootType: {
    fields: { // array with the fields of the root ype
      user: {
        type: {
          fields: {
            lastname: {...},
            settings: {...},
          }
        },
        resolve: () => ({})  // point to a resolve function for the type name
      },
      settings: {
        type: {
          fields: {
            membership: {...},
          }
        },
        resolve: () => ({})  // point to a resolve function for the type name
      }
    }
  },
};