Permit nodejs targets to have a preamble.

src/clj/cljs/closure.clj

@@ -712,11 +712,9 @@
   (str (apply str (map #(slurp (io/resource %)) paths)) "\n"))
 
 (defn make-preamble [{:keys [target preamble hashbang]}]
-  (if preamble
-    (preamble-from-paths preamble)
-    (if (= :nodejs target)
-      (str "#!" (or hashbang "/usr/bin/env node") "\n")
-      "")))
+  (str (when (= :nodejs target)
+         (str "#!" (or hashbang "/usr/bin/env node") "\n"))
+       (when preamble (preamble-from-paths preamble))))
 
 (comment
   ;; add dependencies to literal js

test/clj/cljs/closure_tests.clj

@@ -1,2 +1,21 @@
 (ns cljs.closure-tests
+  (:use cljs.closure)
   (:use clojure.test))
+
+(deftest test-make-preamble
+  (testing "no options"
+    (is (= "" (make-preamble {}))))
+  (testing "nodejs"
+    (testing "with default hashbang"
+      (is (= "#!/usr/bin/env node\n" (make-preamble {:target :nodejs}))))
+    (testing "with custom hashbang"
+      (is (= "#!/bin/env node\n" (make-preamble {:target :nodejs
+                                                 :hashbang "/bin/env node"}))))
+    (testing "with preamble"
+      (is (= "#!/usr/bin/env node\nvar preamble1 = require(\"preamble1\");\n"
+             (make-preamble {:target :nodejs
+                             :preamble ["cljs/preamble1.js"]})))))
+  (testing "preamble"
+    (is (= "var preamble1 = require(\"preamble1\");var preamble2 = require(\"preamble2\");\n"
+           (make-preamble {:preamble ["cljs/preamble1.js"
+                                      "cljs/preamble2.js"]})))))

test/clj/cljs/preamble1.js

@@ -0,0 +1 @@
+var preamble1 = require("preamble1");

test/clj/cljs/preamble2.js

@@ -0,0 +1 @@
+var preamble2 = require("preamble2");