promise.clj

(-> (js/fetch "/api.json")
  (.then (fn [response]
           ;; I can access the response/headers, but can't access the json/body. :(
           (.json response)))
  (.then (fn [json]
           ;; I can access the json/body, but can't access the response/headers. :(
           ...)))

(-> (js/fetch "/api.json")
  (.then (fn [response]
           (.then (.json response)
             (fn [json] {:res response :json-body json}))))
  (.then (fn [{:keys [res json-body]}]
           ;; Access both response/headers and json/body :)
           ...)))