Vendor dependencies

Let's see how I like this workflow.

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

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+const wasm = require('wasm-bindgen-test.js');
+const assert = require('assert');
+
+// NB: `wasm-pack` uses the presence of checks for moved values as a way to test
+// whether it is correctly enabling `--debug` when configured to do so, so don't
+// change this expected debug output without also updating `wasm-pack`'s tests.
+const assertMovedPtrThrows = process.env.WASM_BINDGEN_NO_DEBUG == null
+    ? f => assert.throws(f, /Attempt to use a moved value/)
+    : f => assert.throws(f, /null pointer passed to rust/);
+
+const useMoved = () => {
+    const apple = new wasm.Fruit('apple');
+    apple.name();
+    wasm.eat(apple);
+    assertMovedPtrThrows(() => apple.name());
+};
+
+const moveMoved = () => {
+    const pear = new wasm.Fruit('pear');
+    pear.name();
+    wasm.eat(pear);
+    assertMovedPtrThrows(() => wasm.eat(pear));
+};
+
+const methodMoved = () => {
+    const quince = new wasm.Fruit('quince');
+    quince.name();
+    quince.rot();
+    assertMovedPtrThrows(() => quince.rot());
+};
+
+exports.js_works = () => {
+    useMoved();
+    moveMoved();
+    methodMoved();
+
+    const a = new wasm.Fruit('a');
+    a.prop;
+    assertMovedPtrThrows(() => a.prop);
+    const b = new wasm.Fruit('a');
+    b.prop = 3;
+    assertMovedPtrThrows(() => { b.prop = 4; });
+};