diff --git a/src/datomish/js.cljs b/src/datomish/js.cljs
index c42dd25e..c67f7854 100644
--- a/src/datomish/js.cljs
+++ b/src/datomish/js.cljs
@@ -1,11 +1,47 @@
+;; This Source Code Form is subject to the terms of the Mozilla Public
+;; License, v. 2.0. If a copy of the MPL was not distributed with this
+;; file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
 (ns datomish.js
   (:refer-clojure :exclude [])
+  (:require-macros
+     [datomish.pair-chan :refer [go-pair <?]])
   (:require
-   [datomish.core :as d]
-   [cljs.reader]))
+     [cljs.core.async :as a :refer [take! <! >!]]
+     [cljs.reader]
+     [cljs-promises.core :refer [promise]]
+     [datomish.db :as db]
+     [datomish.db-factory :as db-factory]
+     [datomish.pair-chan]
+     [datomish.sqlite :as sqlite]
+     [datomish.js-sqlite :as js-sqlite]
+     [datomish.transact :as transact]))
+
+(defn- take-pair-as-promise! [ch]
+  ;; Just like take-as-promise!, but aware that it's handling a pair channel.
+  (promise
+    (fn [resolve reject]
+      (letfn [(split-pair [[v e]]
+                (if e
+                  (reject e)
+                  (resolve v)))]
+        (cljs.core.async/take! ch split-pair)))))
 
 ;; Public API.
 
+(defn ^:export open [path]
+  ;; Eventually, URI.  For now, just a plain path (no file://).
+  (take-pair-as-promise!
+    (go-pair
+      (let [conn (<? (sqlite/<sqlite-connection path))
+            db (<? (db-factory/<db-with-sqlite-connection conn))]
+        (let [c (transact/connection-with-db db)]
+        (clj->js
+          {:conn c
+           :close (fn [] (db/close-db db))
+           :toString (fn [] (str "#<DB " path ">"))
+           :path path}))))))
+
 (defn ^:export q [query & sources]
   (let [query   (cljs.reader/read-string query)]
     (clj->js query)))