Vendor dependencies

Let's see how I like this workflow.

vendor/wasm-bindgen/tests/wasm/structural.js

@@ -0,0 +1,13 @@
+const wasm = require('wasm-bindgen-test.js');
+const assert = require('assert');
+
+exports.js_works = () => {
+    let called = false;
+    wasm.run({
+        bar() {
+            called = true;
+        },
+        baz: 1,
+    });
+    assert.strictEqual(called, true);
+};