(def schema-str "type User {
    name: String
    age: Int
  }
  type QueryRoot {
    user: User
  }

  schema {
    query: QueryRoot
  }")

(defn resolver-fn [type-name field-name]
  (get-in {"QueryRoot" {"user" (fn [context parent args]
                                 {:name "test user name"
                                  :age 30})}}
          [type-name field-name]))

    (require '[graphql-clj.executor :as executor])
    (def query-str "query {user {name age}}")

    (executor/execute nil schema-str resolver-fn query-str)
    ;; => {:data {"user" {"name" "test user name", "age" 30}}}

    (require '[graphql-clj.schema-validator :as schema-validator])
    (require '[graphql-clj.query-validator :as query-validator])
    
    ;; Consider memoizing the result of parsing and validating the query before execution
    (def validated-schema (schema-validator/validate-schema schema-str)) ; throw ex-info with ex-data {:errors errors}
    (def validated-query (query-validator/validate-query validated-schema query-str)) ; return [errors validated-ast]

    (executor/execute nil validated-schema resolver-fn validated-query)
    ;; => {:data {"user" {"name" "test user name", "age" 30}}}