diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..41abc6c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,23 @@
+target/
+node_modules/
+checkouts/
+pom.xml
+pom.xml.asc
+*.iml
+*.jar
+*.js.map
+*.class
+.cpcache
+.cljs-cache
+.shadow-cljs
+.cljs-repl
+.cljs_node_repl
+.idea
+.lein-*
+.nrepl-*
+/tmp
+.DS_Store
+yarn.lock
+package-lock.json
+/package.json
+*.log
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ae40cb0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+This is a utility used by `shadow-cljs` to resolve/download dependencies.
+
+https://github.com/thheller/shadow-cljs
diff --git a/project.clj b/project.clj
new file mode 100644
index 0000000..e55d787
--- /dev/null
+++ b/project.clj
@@ -0,0 +1,15 @@
+(defproject shadow-cljs/launcher "1.2.0"
+  :description "CLJS development tools"
+  :url "https://github.com/thheller/shadow-cljs"
+  :dependencies
+  [[org.clojure/clojure "1.9.0"]
+   [com.cemerick/pomegranate "1.0.0"]
+   [org.slf4j/slf4j-nop "1.7.25"]]
+
+  :source-paths
+  ["src/main"]
+
+  :profiles
+  {:uberjar
+   {:aot [shadow.cljs.launcher.deps]
+    :main shadow.cljs.launcher.deps}})
diff --git a/src/main/shadow/cljs/launcher/deps.clj b/src/main/shadow/cljs/launcher/deps.clj
new file mode 100644
index 0000000..be8a4c4
--- /dev/null
+++ b/src/main/shadow/cljs/launcher/deps.clj
@@ -0,0 +1,71 @@
+(ns shadow.cljs.launcher.deps
+  "lightweight launcher that just downloads jars and builds a classpath"
+  (:gen-class)
+  (:require
+    [clojure.java.io :as io]
+    [cemerick.pomegranate.aether :as aether]))
+
+(defn transfer-listener
+  [{:keys [type error resource] :as info}]
+  (let [{:keys [name repository]} resource]
+    (binding [*out* *err*]
+      (case type
+        :started (println "Retrieving" name "from" repository)
+        ;; :progressed
+        ;; :succeeded
+        :corrupted (when error (println (.getMessage error)))
+        nil))))
+
+(defn -main []
+  (try
+    (let [{:keys [cache-root repositories proxy local-repo dependencies mirrors version]
+           :or {dependencies []
+                repositories {}
+                cache-root ".shadow-cljs"}
+           :as config}
+          (read *in*)]
+
+      (println "shadow-cljs - updating dependencies")
+
+      ;; FIXME: resolve conflicts?
+      (let [resolve-args
+            (-> {:coordinates
+                 dependencies
+                 :repositories
+                 (merge aether/maven-central {"clojars" "https://clojars.org/repo"} repositories)
+                 :transfer-listener
+                 transfer-listener}
+                (cond->
+                  mirrors
+                  (assoc :mirrors mirrors)
+                  proxy
+                  (assoc :proxy proxy)
+                  local-repo
+                  (assoc :local-repo local-repo)
+                  ))
+
+            deps
+            (apply aether/resolve-dependencies (into [] (mapcat identity) resolve-args))
+
+            files
+            (into [] (map #(.getAbsolutePath %)) (aether/dependency-files deps))
+
+            result
+            {:dependencies dependencies
+             :version version
+             :files files
+             :deps deps}
+
+            classpath-file
+            (io/file cache-root "classpath.edn")]
+
+        (io/make-parents classpath-file)
+
+        (spit classpath-file (pr-str result)))
+
+      (println "shadow-cljs - dependencies updated"))
+
+    (catch Exception e
+      (println "shadow-cljs - dependency update failed -" (.getMessage e))
+      (System/exit 1)
+      )))
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