Vendor dependencies

Let's see how I like this workflow.

vendor/js-sys/tests/wasm/JsString.js

@@ -0,0 +1,7 @@
+exports.new_string_object = () => new String("hi");
+
+exports.get_replacer_function = function() {
+	return function upperToHyphenLower(match, offset, string) {
+		return (offset > 0 ? '-' : '') + match.toLowerCase();
+	};
+};