fix #626, add AMD module format and make it default

test/codegen_expected/sunflower/sunflower.js.map

Index: test/codegen_expected/sunflower/sunflower.js.map
diff --git a/test/codegen_expected/sunflower/sunflower.js.map b/test/codegen_expected/sunflower/sunflower.js.map
new file mode 100644
index 0000000000000000000000000000000000000000..485717abb82b9871e1f3134d9148191b68ddf542
--- /dev/null
+++ b/test/codegen_expected/sunflower/sunflower.js.map
@@ -0,0 +1 @@
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