diff --git a/project.clj b/project.clj
index fd2966b..6d2edaf 100644
--- a/project.clj
+++ b/project.clj
@@ -46,4 +46,5 @@
   :aliases {"cleantest" ["do" "clean,"
                          "cljx" "once,"
                          "test"]
-            "deploy" ["do" "clean," "cljx" "once," "deploy" "clojars"]})
+            "deploy" ["do" "clean," "cljx" "once," "deploy" "clojars"]}
+  )
diff --git a/repl.clj b/repl.clj
index fb0ad2b..c472bca 100644
--- a/repl.clj
+++ b/repl.clj
@@ -4,7 +4,15 @@
 
 (cljs.build.api/build "target/classes/com/rpl"
   {:output-to "out/main.js"
-   :verbose true})
+   :verbose true
+   :warning-handlers [(fn [warning-type env extra]
+                     (when (warning-type cljs.analyzer/*cljs-warnings*)
+                       (when-let [s (cljs.analyzer/error-message warning-type extra)]
+                         (binding [*out* *err*]
+                           (println "WARNING:" (cljs.analyzer/message env s))
+                           (println "Failed to build because of warning!")
+                           )
+                         (System/exit 1))))]})
 
 (cljs.repl/repl (cljs.repl.node/repl-env)
   :watch "target/classes/com/rpl"
diff --git a/scripts/benchmarks.clj b/scripts/benchmarks.clj
index 3a1800e..cf80a41 100644
--- a/scripts/benchmarks.clj
+++ b/scripts/benchmarks.clj
@@ -1,7 +1,7 @@
 (ns com.rpl.specter.benchmarks
   (:use [com.rpl.specter]
         [com.rpl.specter macros]
-        [com.rpl.specter.transient]
+        [com.rpl.specter.transients]
         [com.rpl.specter.impl :only [benchmark]])
   (:require [clojure.walk :as walk]))
 
diff --git a/src/clj/com/rpl/specter/transient.cljx b/src/clj/com/rpl/specter/transient.cljx
deleted file mode 100644
index dd11f36..0000000
--- a/src/clj/com/rpl/specter/transient.cljx
+++ /dev/null
@@ -1,91 +0,0 @@
-(ns com.rpl.specter.transient
-  #+cljs
-  (:require-macros [com.rpl.specter.macros
-                    :refer
-                    [defnav
-                     defpathedfn]])
-  (:use #+clj
-        [com.rpl.specter.macros :only
-         [defnav
-          defpathedfn]])
-  (:require [com.rpl.specter.impl :as i]
-            [com.rpl.specter :refer [subselect selected?]]))
-
-(defnav
-  ^{:doc "Navigates to the specified key of a transient collection,
-          navigating to nil if it doesn't exist."}
-  keypath!
-  [key]
-  (select* [this structure next-fn]
-    (next-fn (get structure key)))
-  (transform* [this structure next-fn]
-    (assoc! structure key (next-fn (get structure key)))))
-
-(def END!
-  "Navigates to an empty (persistent) vector at the end of a transient vector."
-  (i/comp-paths* (i/->TransientEndNavigator)))
-
-(defn- t-get-first
-  [tv]
-  (nth tv 0))
-
-(defn- t-get-last
-  [tv]
-  (nth tv (dec (i/transient-vec-count tv))))
-
-(defn- t-update-first
-  [tv next-fn]
-  (assoc! tv 0 (next-fn (nth tv 0))))
-
-(defn- t-update-last
-  [tv next-fn]
-  (let [i (dec (i/transient-vec-count tv))]
-    (assoc! tv i (next-fn (nth tv i)))))
-
-(def FIRST!
-  "Navigates to the first element of a transient vector."
-  (i/->PosNavigator t-get-first t-update-first))
-
-(def LAST!
-  "Navigates to the last element of a transient vector."
-  (i/->PosNavigator t-get-last t-update-last))
-
-#+clj
-(defn- select-keys-from-transient-map
-  "Selects keys from transient map, because built-in select-keys uses
-  `find` which is unsupported."
-  [m m-keys]
-  (loop [result {}
-         m-keys m-keys]
-    (if-not (seq m-keys)
-      result
-      (let [k (first m-keys)
-            ;; support Clojure 1.6 where contains? is broken on transients
-            item (get m k ::not-found)]
-        (recur (if-not (identical? item ::not-found)
-                 (assoc result k item)
-                 result)
-               (rest m-keys))))))
-
-#+cljs
-(defn- select-keys-from-transient-map
-  "Uses select-keys on a transient map."
-  [m m-keys]
-  (select-keys m m-keys))
-
-(defnav
-  ^{:doc "Navigates to the specified persistent submap of a transient map."}
-  submap!
-  [m-keys]
-  (select* [this structure next-fn]
-    (next-fn (select-keys-from-transient-map structure m-keys)))
-  (transform* [this structure next-fn]
-    (let [selected (select-keys-from-transient-map structure m-keys)
-          res (next-fn selected)]
-      (as-> structure %
-        (reduce (fn [m k]
-                  (dissoc! m k))
-                % m-keys)
-        (reduce-kv (fn [m k v]
-                     (assoc! m k v))
-                   % res)))))
diff --git a/test/com/rpl/specter/core_test.cljx b/test/com/rpl/specter/core_test.cljx
index 6493f6c..96f866f 100644
--- a/test/com/rpl/specter/core_test.cljx
+++ b/test/com/rpl/specter/core_test.cljx
@@ -27,7 +27,7 @@
             #+cljs [cljs.test.check.generators :as gen]
             #+cljs [cljs.test.check.properties :as prop :include-macros true]
             [com.rpl.specter :as s]
-            [com.rpl.specter.transient :as t]
+            [com.rpl.specter.transients :as t]
             [clojure.set :as set]))
 
 ;;TODO: