Vendor dependencies

Let's see how I like this workflow.

vendor/wasm-bindgen/tests/wasm/option.rs

@@ -0,0 +1,61 @@
+use wasm_bindgen::prelude::*;
+use wasm_bindgen_test::*;
+
+#[wasm_bindgen(module = "tests/wasm/option.js")]
+extern "C" {
+    pub type MyType;
+    #[wasm_bindgen(constructor)]
+    fn new() -> MyType;
+
+    fn take_none_byval(t: Option<MyType>);
+    fn take_some_byval(t: Option<MyType>);
+    fn return_undef_byval() -> Option<MyType>;
+    fn return_null_byval() -> Option<MyType>;
+    fn return_some_byval() -> Option<MyType>;
+    fn test_option_values();
+
+    #[wasm_bindgen(js_name = take_none_byval)]
+    fn take_none_byref(t: Option<&MyType>);
+    #[wasm_bindgen(js_name = take_some_byval)]
+    fn take_some_byref(t: Option<&MyType>);
+}
+
+#[wasm_bindgen_test]
+fn import_by_value() {
+    take_none_byval(None);
+    take_some_byval(Some(MyType::new()));
+    assert!(return_null_byval().is_none());
+    assert!(return_undef_byval().is_none());
+    assert!(return_some_byval().is_some());
+}
+
+#[wasm_bindgen_test]
+fn export_by_value() {
+    test_option_values();
+}
+
+#[wasm_bindgen]
+pub fn rust_take_none_byval(t: Option<MyType>) {
+    assert!(t.is_none());
+}
+
+#[wasm_bindgen]
+pub fn rust_take_some_byval(t: Option<MyType>) {
+    assert!(t.is_some());
+}
+
+#[wasm_bindgen]
+pub fn rust_return_none_byval() -> Option<MyType> {
+    None
+}
+
+#[wasm_bindgen]
+pub fn rust_return_some_byval() -> Option<MyType> {
+    Some(MyType::new())
+}
+
+#[wasm_bindgen_test]
+fn import_by_ref() {
+    take_none_byref(None);
+    take_some_byref(Some(&MyType::new()));
+}