diff --git a/project.clj b/project.clj
index fa013cd..79afacb 100644
--- a/project.clj
+++ b/project.clj
@@ -2,13 +2,13 @@
   :description "CLJSFiddle"
   :url "http://cljsfiddle.net"
   :dependencies [[org.clojure/clojure "1.6.0"]
-                 [org.clojure/clojurescript "0.0-2227"]
+                 [org.clojure/clojurescript "0.0-2850"]
                  [org.clojure/tools.reader "0.8.4"]
                  [org.clojure/core.match "0.2.1"]
-                 [org.clojure/core.async "0.1.303.0-886421-alpha"]
+                 [org.clojure/core.async "0.1.346.0-17112a-alpha"]
                  [org.clojure/core.logic "0.8.7"]
                  [org.clojure/tools.macro "0.1.5"]
-                 [com.datomic/datomic-free "0.9.4815"]
+                 [com.datomic/datomic-free "0.9.5130"]
                  [ring/ring-jetty-adapter "1.3.0"]
                  [ring/ring-devel "1.3.0"]
                  [fogus/ring-edn "0.2.0"]
@@ -21,16 +21,19 @@
                  [environ "0.5.0"]
                  [com.taoensso/timbre "3.2.1"]
                  [hylla "0.2.0"]
-                 [domina "1.0.2"]
-                 [prismatic/dommy "0.1.2"]
+                 [domina "1.0.3"]
+                 [prismatic/dommy "1.0.0"]
+                 [org.omcljs/om "0.8.8"]
+                 [reagent "0.5.0-alpha3"]
+                 [quiescent "0.1.4"]
                  [hiccups "0.3.0"]
-                 [cljs-ajax "0.2.4"]
-                 [om "0.6.4"]
-                 [quiescent "0.1.3"]
-                 [reagent "0.4.2"]]
+                 [cljs-ajax "0.3.10"]
+                 [rum "0.2.5"]
+                 [datascript "0.9.0"]
+]
   :source-paths ["src/clj" "src/cljs"]
   :plugins [[lein-ring "0.8.10"]
-            [lein-cljsbuild "1.0.3"]]
+            [lein-cljsbuild "1.0.4"]]
 ;  :main cljsfiddle.handler
 ;  :uberjar-name "cljsfiddle-standalone.jar"
   :min-lein-version "2.0.0"
@@ -43,7 +46,7 @@
                         :source-paths ["src/cljs"]
                         :compiler {:output-to "resources/public/js/app.js"
                                    :output-dir "resources/public/js/out-dev"
-                                   :source-map true
+                                   :source-map "resources/public/js/app.js.map"
                                    :optimizations :simple
                                    :pretty-print true}}
                        :prod {
diff --git a/src/clj/cljsfiddle/closure.clj b/src/clj/cljsfiddle/closure.clj
index da3d76f..840767c 100644
--- a/src/clj/cljsfiddle/closure.clj
+++ b/src/clj/cljsfiddle/closure.clj
@@ -8,6 +8,7 @@
             [cljsfiddle.db.src :as src]
             [cljs.closure :as cljs]
             [cljs.env :as cljs-env]
+            [cljsfiddle.compiler :refer [compiler-env]]
             [taoensso.timbre :as log]
             [clojure.pprint :refer [pprint]]
             [datomic.api :as d]
@@ -17,7 +18,7 @@
            [java.util.logging Level]
            [java.io StringReader BufferedReader]
            [com.google.javascript.jscomp.Compiler]
-           [com.google.javascript.jscomp JSSourceFile
+           [com.google.javascript.jscomp SourceFile
                                          CompilerOptions
                                          CompilationLevel
                                          ClosureCodingConvention]))
@@ -31,11 +32,7 @@
    :body (pr-str edn-data)})
 
 (defn compile-cljs* [cljs-src-str]
-  (let [cljs-src (read-all cljs-src-str)
-        js-src (cljs-env/with-compiler-env
-                 (cljs-env/default-compiler-env)
-                 (cljs/-compile cljs-src {}))]
-    js-src))
+  (:js-src (cljsfiddle.db.util/cljs-object-from-src cljs-src-str)))
 
 (defn js-errors [error]
   {:description (.description error)
@@ -53,8 +50,8 @@
                               (.setOptionsForCompilationLevel level compiler-options)
                               compiler-options)
              compiler (com.google.javascript.jscomp.Compiler.)
-             src (JSSourceFile/fromCode name src)
-             externs (JSSourceFile/fromCode "externs" "")
+             src (SourceFile/fromCode name src)
+             externs (SourceFile/fromCode "externs" "")
              result (.compile compiler externs src options)]
          (if (.success result)
            (merge {:status :success
@@ -81,7 +78,11 @@
              tdb (:db-after (d/with db (:tx cljs-tx)))
              deps (db/dependency-files tdb (:ns cljs-obj))
              js-src-obj (closure-compile (:js-src cljs-obj))
-             js-src-obj (assoc js-src-obj :dependencies deps :status :ok)]
+             js-src-obj (assoc js-src-obj
+                          :dependencies deps
+                          :deps-src (:deps-src cljs-obj)
+                          :status :ok)]
+
          (edn-response js-src-obj))
        (catch clojure.lang.ExceptionInfo e
          (edn-response
diff --git a/src/clj/cljsfiddle/compiler.clj b/src/clj/cljsfiddle/compiler.clj
new file mode 100644
index 0000000..005568a
--- /dev/null
+++ b/src/clj/cljsfiddle/compiler.clj
@@ -0,0 +1,17 @@
+(ns cljsfiddle.compiler
+  (:require [cljs.closure :as closure]
+            [cljs.js-deps :as deps]
+            [cljs.env :as cljs-env]
+            [cljs.compiler :as compiler]))
+
+
+(let [ups-deps (closure/get-upstream-deps)
+      opts {:ups-libs (:libs ups-deps)
+            :ups-foreign-libs (:foreign-libs ups-deps)
+            :ups-externs (:externs ups-deps)}
+
+     env (cljs-env/default-compiler-env opts)]
+
+    (swap! env assoc :js-dependency-index (deps/js-dependency-index opts))
+
+   (def compiler-env env))
diff --git a/src/clj/cljsfiddle/db/util.clj b/src/clj/cljsfiddle/db/util.clj
index d35be02..d449e8c 100644
--- a/src/clj/cljsfiddle/db/util.clj
+++ b/src/clj/cljsfiddle/db/util.clj
@@ -3,10 +3,13 @@
             [clojure.java.io :as io]
             [clojure.tools.reader :as reader]
             [datomic.api :as d]
+            [cljs.analyzer :as ana]
             [cljs.env :as cljs-env]
             [cljs.closure :as closure]
             [cljs.js-deps :as cljs-deps]
+            [cljsfiddle.compiler :refer [compiler-env]]
             [cljs.tagged-literals :as tags]
+            [taoensso.timbre :as log]
             [environ.core :refer (env)])
   (:import [clojure.lang LineNumberingPushbackReader]
            [java.io StringReader BufferedReader]
@@ -37,14 +40,38 @@
       line-seq
       cljs-deps/parse-js-ns))
 
+(comment
+  (defn log-time [prev txt]
+  (let [cur (System/nanoTime)
+        diff (- cur prev)
+        ms (-> diff
+               (/ 1000000) int)]
+    (log/trace (format "%dms | %s" ms txt))
+    cur)))
+
 (defn cljs-object-from-src [cljs-src-str]
-  (let [cljs-src (read-all cljs-src-str)
-        js-src (cljs-env/with-compiler-env
-                 (cljs-env/default-compiler-env)
-                 (closure/-compile cljs-src {})) ;; TODO perf.
+  (let [parsed-ns (ana/parse-ns
+                   (-> cljs-src-str
+                       StringReader.
+                       BufferedReader.))
+        cljs-src (binding [*ns* (-> parsed-ns :ns)]
+                   (read-all cljs-src-str))
+        
+        [deps-src js-src]
+        (cljs-env/with-compiler-env compiler-env
+          (let [opts {}
+
+                compiled (closure/-compile cljs-src opts)
+                js-sources (closure/add-dependencies opts compiled)
+                fdeps-str  (closure/foreign-deps-str
+                            opts
+                            (filter closure/foreign-source? js-sources))]
+
+            [fdeps-str compiled]))
         {:keys [provides requires]} (parse-js-ns js-src)]
     {:src cljs-src-str
      :js-src js-src
+     :deps-src deps-src
      :sha (sha cljs-src-str)
      :ns (first provides)
      :requires (set requires)}))
diff --git a/src/clj/cljsfiddle/import.clj b/src/clj/cljsfiddle/import.clj
index a389051..2c3f9d8 100644
--- a/src/clj/cljsfiddle/import.clj
+++ b/src/clj/cljsfiddle/import.clj
@@ -21,9 +21,15 @@
   (let [uri (or uri
                 (env :datomic-uri)
                 "datomic:free://localhost:4334/cljsfiddle")]
+    (prn "creating db")
     (d/create-database uri)
+    (prn "ok")
     (let [conn (d/connect uri)]
-       @(d/transact conn schema))))
+      (prn "creating schema")
+      @(d/transact conn schema)
+      (prn "ok")
+      (System/exit 0)
+      )))
 
 ;; Import js and cljs from the classpath into datomic.
 
@@ -74,8 +80,11 @@
 ;; TODO: Figure out if schema is installed.
 (defn -main [uri]
   (let [conn (d/connect uri)
-        files (find-files #{"cljs/" "clojure/" "goog/" "domina" "hiccups" 
-                            "dommy" "om" "quiescent" "reagent"}
+        files (find-files #{"cljs/" "clojure/" "goog/" "domina" "hiccups"
+                            "cljsjs"
+                            "react" "om"  "quiescent" "reagent"
+                            "rum" "sablono" "datascript"
+                            "dommy"}
                           (filter #(.endsWith % ".jar")
                                   (-> "java.class.path"
                                       System/getProperty
@@ -86,12 +95,13 @@
         cljs-objects (map cljs-object-from-file cljs-files)]
     (println "transacting cljs")
     (doseq [cljs cljs-objects]
+      (pr "Considering " (:file cljs) "... ")
+      (flush)
       (let [cljs-tx (:tx (src/cljs-tx (d/db conn) cljs))]
-        (print "Considering " (:file cljs) "... ")
         (if-not (empty? cljs-tx)
           (do @(d/transact conn cljs-tx)
-              (println "transacted."))
-          (println "skipped.")
+              (prn "transacted."))
+          (prn "skipped.")
           )))
     (println "done.")
     (println "transacting js")
@@ -116,7 +126,8 @@
 
     (println "Running storage GC")
     (d/gc-storage conn (Date.))
-    (println "Done.")))
+    (println "Done."))
+  (System/exit 0))
 
 ;; (-main (env :datomic-uri))
 
diff --git a/src/clj/cljsfiddle/views.clj b/src/clj/cljsfiddle/views.clj
index c508360..8ccd7e6 100644
--- a/src/clj/cljsfiddle/views.clj
+++ b/src/clj/cljsfiddle/views.clj
@@ -1,7 +1,7 @@
 (ns cljsfiddle.views
   (:require [hiccup.util :refer (escape-html)]
             [environ.core :refer (env)]
-            [cljsfiddle.closure :refer [compile-cljs*]]))
+            [cljsfiddle.db.util :refer [cljs-object-from-src]]))
 
 (def google-analytics-script
   "(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
@@ -113,6 +113,11 @@
            [:a {:href "http://cljsfiddle.net"} "cljsfiddle.net"] " © 2013 Jonas Enlund"]]]))
 
 (defn html-view [ns fiddle deps]
+  (let [cljs-obj (-> fiddle
+                       :cljsfiddle/cljs
+                       :cljsfiddle.src/blob
+                       :cljsfiddle.blob/text
+                       cljs-object-from-src)]
   [:html
    [:head
     [:title ns]
@@ -128,14 +133,10 @@
         :cljsfiddle.blob/text)
     [:script "CLOSURE_NO_DEPS=true;"]
     [:script "COMPILED=true;"]
+    [:script (:deps-src cljs-obj)]
     (for [dep deps]
       [:script {:src (str "/jscache/" (env :cljsfiddle-version) "/" dep)}])
-    [:script
-     (-> fiddle
-          :cljsfiddle/cljs
-          :cljsfiddle.src/blob
-          :cljsfiddle.blob/text
-          compile-cljs*)]]])
+    [:script (:js-src cljs-obj)]]]))
 
 (defn about-view [user]
   (base (navbar user)
diff --git a/src/cljs/cljsfiddle/core.cljs b/src/cljs/cljsfiddle/core.cljs
index 1be4cef..adba001 100644
--- a/src/cljs/cljsfiddle/core.cljs
+++ b/src/cljs/cljsfiddle/core.cljs
@@ -1,4 +1,5 @@
 (ns cljsfiddle.core
+  (:require-macros [hiccups.core :as hiccups])
   (:require [clojure.string :as s]
             [cljs.reader :as reader]
             [domina :as dom]
@@ -21,14 +22,15 @@
              [:script {:src (str "/jscache/" version "/" (s/replace dep ".cljs" ".js"))}])]
     (apply str (map render-html (concat html ds)))))
 
-(defn make-srcdoc [html css js deps version]
-  (render-html
+(defn make-srcdoc [html css js deps-src deps version]
+  (hiccups/html
    [:html
     [:head
      [:style css]]
     [:body
      [:script "window.onerror = function(msg, url, line) { parent.postMessage('{:type :runtime-error}', '*'); return false;};"]
      html
+     [:script (or deps-src "")]
      (make-deps deps version)
      [:script "cljs.core.set_print_fn_BANG_.call(null,function(s){var s = s.replace(/\"/g, \""\"); parent.postMessage('{:type :runtime-print :to-print \"' + s + '\"}', '*');});"]
      [:script js]
@@ -99,7 +101,7 @@
                                    ">" ">"})])
 
 (defn output-html [msg]
-  (render-html (output-hiccup msg)))
+  (hiccups/html (output-hiccup msg)))
 
 (defn output-fn []
   (let [out (dom/by-id "output")]
@@ -156,6 +158,7 @@
                       (dom/add-class! run-btn "disabled")
                       (http/POST "/compiler/compile"
                         {:params {:src (.getValue cljs-editor)}
+                         :format :edn
                          :handler (fn [res]
                                     (dom/remove-class! run-btn "disabled")
                                     (condp = (:status res)
@@ -163,6 +166,7 @@
                                       (let [srcdoc (make-srcdoc (.getValue html-editor)
                                                                 (.getValue css-editor)
                                                                 (:js-src res)
+                                                                (:deps-src res)
                                                                 (:dependencies res)
                                                                 version)]
                                         (.setAttribute result-frame "srcdoc" srcdoc))
@@ -174,6 +178,7 @@
                         {:params {:cljs (.getValue cljs-editor)
                                   :html (.getValue html-editor)
                                   :css (.getValue css-editor)}
+                         :format :edn
                          :handler (fn [res]
                                     (dom/remove-class! save-btn "disabled")
                                     (if (= (:status res) :success)