Vendor dependencies

Let's see how I like this workflow.

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

@@ -0,0 +1,44 @@
+const assert = require('assert');
+const wasm = require('wasm-bindgen-test');
+
+exports.call_exports = async function() {
+  await wasm.async_do_nothing();
+  assert.strictEqual(1, await wasm.async_return_1());
+  assert.strictEqual(2, await wasm.async_return_2());
+  await wasm.async_nothing_again();
+  assert.strictEqual(3, await wasm.async_return_3());
+  assert.strictEqual(4, await wasm.async_return_4());
+  assert.strictEqual(5, (await wasm.async_return_5()).val);
+  assert.strictEqual(6, (await wasm.async_return_6()).val);
+  await assert.rejects(wasm.async_throw_7(), /7/);
+  await assert.rejects(wasm.async_throw_custom(), /\[object Object\]/);
+  await assert.rejects(wasm.async_throw_message(), /async message/);
+  await assert.rejects(wasm.async_throw_jserror(), /async message/);
+  await assert.rejects(wasm.async_throw_custom_error(), /custom error/);
+  assert.strictEqual("Hi, Jim!", await wasm.async_take_reference("Jim"));
+  const foo = await new wasm.AsyncStruct();
+  assert.strictEqual(42, await foo.method());
+};
+
+exports.call_promise = async function() {
+    return "ok";
+}
+
+exports.call_promise_ok = async function() {
+    return "ok";
+}
+
+exports.call_promise_err = async function() {
+    throw "error";
+}
+
+exports.call_promise_unit = async function() {
+    console.log("asdfasdf");
+}
+
+exports.call_promise_ok_unit = async function() {
+}
+
+exports.call_promise_err_unit = async function() {
+    throw "error";
+}