diff --git a/demo/demo.cljs b/demo/demo.cljs
index 4e5f765..b7d941b 100644
--- a/demo/demo.cljs
+++ b/demo/demo.cljs
@@ -1,6 +1,6 @@
 (ns demo
   (:require [reagent.core :as reagent :refer [atom]]
-            [reagent.interop :refer-macros [.' .! fvar]]
+            [reagent.interop :as i :refer-macros [.' .! fvar]]
             [clojure.string :as string]
             [reagentdemo.page :as page :refer [page-map page link prefix]]
             [reagentdemo.common :as common :refer [demo-component]]
@@ -8,6 +8,8 @@
             [reagentdemo.news :as news]
             [reagent.debug :refer-macros [dbg println]]))
 
+(i/import-react)
+
 (swap! page-map assoc
        "index.html" (fvar intro/main)
        "news/index.html" (fvar news/main))
diff --git a/project.clj b/project.clj
index 38a46e3..3f349bb 100644
--- a/project.clj
+++ b/project.clj
@@ -13,7 +13,6 @@
                      {:client {:compiler
                                {:optimizations :advanced
                                 :elide-asserts true
-                                :preamble ^:replace ["reagent/react.min.js"]
                                 :pretty-print false}}}}}
              :test {:cljsbuild
                     {:builds
@@ -37,7 +36,6 @@
                             "examples/geometry/src"]
              :notify-command ["node" "./bin/gen-site.js"]
              :compiler
-             {:preamble ["reagent/react.js"]
-              :output-dir "target/client"
+             {:output-dir "target/client"
               :output-to "target/cljs-client.js"
               :pretty-print true}}}})
diff --git a/src/reagent/core.cljs b/src/reagent/core.cljs
index 90b51ad..f8ce354 100644
--- a/src/reagent/core.cljs
+++ b/src/reagent/core.cljs
@@ -9,8 +9,6 @@
             [reagent.debug :refer-macros [dbg prn]]
             [reagent.interop :refer-macros [.' .!]]))
 
-(def React util/React)
-
 (def is-client util/is-client)
 
 (defn as-component
@@ -40,7 +38,7 @@ Returns the mounted component instance."
 (defn render-component-to-string
   "Turns a component into an HTML string."
   ([component]
-     (.' React renderComponentToString (as-component component))))
+     (.' js/React renderComponentToString (as-component component))))
 
 (defn ^:export force-update-all []
   (util/force-update-all))
diff --git a/src/reagent/impl/component.cljs b/src/reagent/impl/component.cljs
index d370e8c..81ea403 100644
--- a/src/reagent/impl/component.cljs
+++ b/src/reagent/impl/component.cljs
@@ -1,6 +1,6 @@
 
 (ns reagent.impl.component
-  (:require [reagent.impl.util :as util :refer [React]]
+  (:require [reagent.impl.util :as util]
             [reagent.impl.batching :as batch]
             [reagent.ratom :as ratom]
             [reagent.interop :refer-macros [.' .!]]
@@ -183,7 +183,7 @@
   (assert (map? body))
   (let [spec (cljsify body)
         _ (.! spec :asComponent (dont-bind as-component))
-        res (.' React createClass spec)
+        res (.' js/React createClass spec)
         f (fn [& args]
             (as-component (apply vector res args)))]
     (util/cache-react-class f res)
diff --git a/src/reagent/impl/template.cljs b/src/reagent/impl/template.cljs
index a7e10f2..4bb1316 100644
--- a/src/reagent/impl/template.cljs
+++ b/src/reagent/impl/template.cljs
@@ -1,20 +1,19 @@
 
 (ns reagent.impl.template
   (:require [clojure.string :as string]
-            [reagent.impl.util :as util :refer [is-client React]]
+            [reagent.impl.util :as util :refer [is-client]]
             [reagent.impl.component :as comp]
             [reagent.impl.batching :as batch]
             [reagent.ratom :as ratom]
             [reagent.interop :refer-macros [.' .!]]
             [reagent.debug :refer-macros [dbg prn println log dev?]]))
 
+
 ;; From Weavejester's Hiccup, via pump:
 (def ^{:doc "Regular expression that parses a CSS-style id and class
              from a tag name."}
   re-tag #"([^\s\.#]+)(?:#([^\s\.#]+))?(?:\.([^\s#]+))?")
 
-(def DOM (.' React :DOM))
-
 (def attr-aliases {:class "className"
                    :for "htmlFor"
                    :charset "charSet"})
@@ -117,8 +116,10 @@
         (.! :value nil)
         (.! :onChange #(input-handle-change this on-change %))))))
 
-(def input-components #{(.' DOM :input)
-                        (.' DOM :textarea)})
+(defn input-component? [x]
+  (let [DOM (.' js/React :DOM)]
+    (or (identical? x (.' DOM :input))
+        (identical? x (.' DOM :textarea)))))
 
 
 ;;; Wrapping of native components
@@ -151,7 +152,7 @@
     (.! :componentWillUnmount #(this-as c (batch/dispose c)))))
 
 (defn wrap-component [comp extras name]
-  (let [input? (input-components comp)
+  (let [input? (input-component? comp)
         input-setup (if input? input-render-setup)
         spec #js{:render
                  #(this-as C (wrapped-render C comp extras input-setup))
@@ -160,14 +161,14 @@
                  :displayName (or name "ComponentWrapper")}]
     (when input?
       (add-input-methods spec))
-    (.' React createClass spec)))
+    (.' js/React createClass spec)))
 
 
 ;;; Conversion from Hiccup forms
 
 (defn parse-tag [hiccup-tag]
   (let [[tag id class] (->> hiccup-tag name (re-matches re-tag) next)
-        comp (aget DOM tag)
+        comp (aget (.' js/React :DOM) tag)
         class' (when class
                  (string/replace class #"\." " "))]
     (assert comp (str "Unknown tag: '" hiccup-tag "'"))
@@ -197,7 +198,7 @@
       (let [cached-class (util/cached-react-class tag)]
         (if-not (nil? cached-class)
           cached-class
-          (if (.' React isValidClass tag)
+          (if (.' js/React isValidClass tag)
             (util/cache-react-class tag (wrap-component tag nil nil))
             (fn-to-class tag)))))))
 
diff --git a/src/reagent/impl/util.cljs b/src/reagent/impl/util.cljs
index 38b19b9..a2581df 100644
--- a/src/reagent/impl/util.cljs
+++ b/src/reagent/impl/util.cljs
@@ -6,8 +6,6 @@
 (def is-client (and (exists? js/window)
                     (-> js/window (.' :document) nil? not)))
 
-(def React js/React)
-
 ;;; Props accessors
 
 (defn extract-props [v]
@@ -128,11 +126,11 @@
 
 (defn re-render-component [comp container]
   (try
-    (.' React renderComponent (comp) container)
+    (.' js/React renderComponent (comp) container)
     (catch js/Object e
       (do
         (try
-          (.' React unmountComponentAtNode container)
+          (.' js/React unmountComponentAtNode container)
           (catch js/Object e
             (log e)))
         (when-let [n (get-react-node container)]
@@ -141,7 +139,7 @@
         (throw e)))))
 
 (defn render-component [comp container callback]
-  (.' React renderComponent (comp) container
+  (.' js/React renderComponent (comp) container
        (fn []
          (let [id (get-root-id container)]
            (when-not (nil? id)
@@ -154,7 +152,7 @@
   (let [id (get-root-id container)]
     (when-not (nil? id)
       (swap! roots dissoc id)))
-  (.' React unmountComponentAtNode container))
+  (.' js/React unmountComponentAtNode container))
 
 (defn force-update-all []
   (binding [*always-update* true]
diff --git a/src/reagent/interop.clj b/src/reagent/interop.clj
index 24cdc55..682e4b4 100644
--- a/src/reagent/interop.clj
+++ b/src/reagent/interop.clj
@@ -1,5 +1,6 @@
 (ns reagent.interop
-  (:require [clojure.string :as string :refer [join]]))
+  (:require [clojure.string :as string :refer [join]]
+            [clojure.java.io :as io]))
 
 (defn- js-call [f args]
   (let [argstr (->> (repeat (count args) "~{}")
@@ -48,6 +49,38 @@
     (assert field (str "Field name must start with - in " field))
     `(aset ~object ~@names ~value)))
 
+(def react-import-ns (atom nil))
+
+(defmacro import-react
+  []
+  "Import React.js.
+  This can be used instead of adding :preamble in project.clj
+  (or adding react.js in a script tag). This may be more convenient when
+  using :optimizations :none, since that doesn't take :preamble into account.
+  Imports minimized version of React if :elide-asserts is true."
+  (if-not (or (nil? @react-import-ns)
+              (= *ns* @react-import-ns))
+    ;; React was already imported in another namespace; so we avoid
+    ;; duplicate imports.
+    true
+    (let [srcfile (if *assert* "reagent/react.js"
+                    "reagent/react.min.js")
+          src (slurp (io/resource srcfile))]
+      (if (nil? @react-import-ns)
+        (reset! react-import-ns *ns*))
+      `(js/eval ~(str "if (typeof React != 'undefined' &&
+                      typeof console != 'undefined') {
+                      console.log('WARNING: React is already defined');
+                      }"
+                      src "; \n"
+                      "console.log('importing');"
+                      "if (typeof module != 'undefined' &&
+                      typeof global != 'undefined' &&
+                      module.exports && module.exports.DOM) {
+                      global.React = module.exports;
+                      } \n
+                      //@ sourceURL=" srcfile "\n")))))
+
 
 (defmacro fvar
   [f]