diff --git a/deno.lock b/deno.lock
index 54e0176..9cfc4f3 100644
--- a/deno.lock
+++ b/deno.lock
@@ -1,5 +1,5 @@
 {
-  "version": "2",
+  "version": "3",
   "remote": {
     "https://deno.land/std@0.142.0/hash/sha1.ts": "679d476b80466c73a1ad6c9ade4a44c188b91bc6bf3f97644209c280c9ec076b",
     "https://deno.land/std@0.198.0/_util/diff.ts": "1a3c044aedf77647d6cac86b798c6417603361b66b54c53331b312caeb447aea",
@@ -9,9 +9,29 @@
     "https://deno.land/std@0.198.0/assert/_constants.ts": "8a9da298c26750b28b326b297316cdde860bc237533b07e1337c021379e6b2a9",
     "https://deno.land/std@0.198.0/assert/_format.ts": "a69126e8a469009adf4cf2a50af889aca364c349797e63174884a52ff75cf4c7",
     "https://deno.land/std@0.198.0/assert/assert.ts": "9a97dad6d98c238938e7540736b826440ad8c1c1e54430ca4c4e623e585607ee",
+    "https://deno.land/std@0.198.0/assert/assert_almost_equals.ts": "e15ca1f34d0d5e0afae63b3f5d975cbd18335a132e42b0c747d282f62ad2cd6c",
+    "https://deno.land/std@0.198.0/assert/assert_array_includes.ts": "6856d7f2c3544bc6e62fb4646dfefa3d1df5ff14744d1bca19f0cbaf3b0d66c9",
     "https://deno.land/std@0.198.0/assert/assert_equals.ts": "a0ee60574e437bcab2dcb79af9d48dc88845f8fd559468d9c21b15fd638ef943",
+    "https://deno.land/std@0.198.0/assert/assert_exists.ts": "407cb6b9fb23a835cd8d5ad804e2e2edbbbf3870e322d53f79e1c7a512e2efd7",
+    "https://deno.land/std@0.198.0/assert/assert_false.ts": "a9962749f4bf5844e3fa494257f1de73d69e4fe0e82c34d0099287552163a2dc",
+    "https://deno.land/std@0.198.0/assert/assert_instance_of.ts": "09fd297352a5b5bbb16da2b5e1a0d8c6c44da5447772648622dcc7df7af1ddb8",
+    "https://deno.land/std@0.198.0/assert/assert_is_error.ts": "b4eae4e5d182272efc172bf28e2e30b86bb1650cd88aea059e5d2586d4160fb9",
+    "https://deno.land/std@0.198.0/assert/assert_match.ts": "c4083f80600bc190309903c95e397a7c9257ff8b5ae5c7ef91e834704e672e9b",
+    "https://deno.land/std@0.198.0/assert/assert_not_equals.ts": "9f1acab95bd1f5fc9a1b17b8027d894509a745d91bac1718fdab51dc76831754",
+    "https://deno.land/std@0.198.0/assert/assert_not_instance_of.ts": "0c14d3dfd9ab7a5276ed8ed0b18c703d79a3d106102077ec437bfe7ed912bd22",
+    "https://deno.land/std@0.198.0/assert/assert_not_match.ts": "3796a5b0c57a1ce6c1c57883dd4286be13a26f715ea662318ab43a8491a13ab0",
+    "https://deno.land/std@0.198.0/assert/assert_not_strict_equals.ts": "ca6c6d645e95fbc873d25320efeb8c4c6089a9a5e09f92d7c1c4b6e935c2a6ad",
+    "https://deno.land/std@0.198.0/assert/assert_object_match.ts": "d8fc2867cfd92eeacf9cea621e10336b666de1874a6767b5ec48988838370b54",
+    "https://deno.land/std@0.198.0/assert/assert_rejects.ts": "45c59724de2701e3b1f67c391d6c71c392363635aad3f68a1b3408f9efca0057",
+    "https://deno.land/std@0.198.0/assert/assert_strict_equals.ts": "5cf29b38b3f8dece95287325723272aa04e04dbf158d886d662fa594fddc9ed3",
+    "https://deno.land/std@0.198.0/assert/assert_string_includes.ts": "b821d39ebf5cb0200a348863c86d8c4c4b398e02012ce74ad15666fc4b631b0c",
+    "https://deno.land/std@0.198.0/assert/assert_throws.ts": "63784e951475cb7bdfd59878cd25a0931e18f6dc32a6077c454b2cd94f4f4bcd",
     "https://deno.land/std@0.198.0/assert/assertion_error.ts": "4d0bde9b374dfbcbe8ac23f54f567b77024fb67dbb1906a852d67fe050d42f56",
     "https://deno.land/std@0.198.0/assert/equal.ts": "9f1a46d5993966d2596c44e5858eec821859b45f783a5ee2f7a695dfc12d8ece",
+    "https://deno.land/std@0.198.0/assert/fail.ts": "c36353d7ae6e1f7933d45f8ea51e358c8c4b67d7e7502028598fe1fea062e278",
+    "https://deno.land/std@0.198.0/assert/mod.ts": "08d55a652c22c5da0215054b21085cec25a5da47ce4a6f9de7d9ad36df35bdee",
+    "https://deno.land/std@0.198.0/assert/unimplemented.ts": "d56fbeecb1f108331a380f72e3e010a1f161baa6956fd0f7cf3e095ae1a4c75a",
+    "https://deno.land/std@0.198.0/assert/unreachable.ts": "4600dc0baf7d9c15a7f7d234f00c23bca8f3eba8b140286aaca7aa998cf9a536",
     "https://deno.land/std@0.198.0/bytes/bytes_list.ts": "31d664f4d42fa922066405d0e421c56da89d751886ee77bbe25a88bf0310c9d0",
     "https://deno.land/std@0.198.0/bytes/concat.ts": "d26d6f3d7922e6d663dacfcd357563b7bf4a380ce5b9c2bbe0c8586662f25ce2",
     "https://deno.land/std@0.198.0/bytes/copy.ts": "939d89e302a9761dcf1d9c937c7711174ed74c59eef40a1e4569a05c9de88219",
diff --git a/lib/args.test.ts b/lib/args.test.ts
new file mode 100644
index 0000000..a01af12
--- /dev/null
+++ b/lib/args.test.ts
@@ -0,0 +1,16 @@
+import { assertEquals } from "https://deno.land/std@0.198.0/assert/mod.ts";
+import { CommonBuild, parseArgs } from "./args.ts";
+
+Deno.test("no default features", () => {
+  const args = parseArgs([
+    "--features",
+    "wasm",
+    "--no-default-features",
+    "--out",
+    "js",
+  ]);
+  assertEquals(
+    (args as CommonBuild).cargoFlags,
+    ["--no-default-features", "--features", "wasm"],
+  );
+});