Vendor dependencies

Let's see how I like this workflow.

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

@@ -0,0 +1,14 @@
+const wasm = require('wasm-bindgen-test.js');
+const assert = require('assert');
+
+exports.call_throw_one = function() {
+  try {
+    wasm.throw_one();
+  } catch (e) {
+    assert.strictEqual(e, 1);
+  }
+};
+
+exports.call_ok = function() {
+  wasm.nothrow();
+};