diff --git a/project.clj b/project.clj
index 54761b86..72b5b9c1 100644
--- a/project.clj
+++ b/project.clj
@@ -48,6 +48,7 @@
                 :compiler
                 {
                  :elide-asserts  true
+                 :externs        ["src-browser/externs.js"]
                  :language-in    :ecmascript5
                  :language-out   :ecmascript5
                  :optimizations  :advanced
diff --git a/src-browser/externs.js b/src-browser/externs.js
new file mode 100644
index 00000000..a39b1a03
--- /dev/null
+++ b/src-browser/externs.js
@@ -0,0 +1,33 @@
+var SqliteStatic = {};
+
+/**
+ * @param {Object} options
+ * @return {Promise.<Sqlite>}
+ */
+SqliteStatic.openConnection = function (options) {}
+
+var Sqlite = {}
+
+/**
+ * @param {string} sql
+ * @param {Array} bindings
+ * @return {Promise}
+ */
+Sqlite.execute = function (sql, bindings) {}
+
+/**
+ * @return {Promise}
+ */
+Sqlite.close = function() {}
+
+var StorageRow = {};
+
+/**
+ * @param {string} index
+ */
+StorageRow.getResultByIndex = function (index) {}
+
+/**
+ * @param {string} name
+ */
+StorageRow.getResultByName = function (name) {}