Work on attachments

src/plugins/proofmodeWorker.js

@@ -0,0 +1,20 @@
+import { Observable, Subject } from "threads/observable";
+import { expose } from "threads/worker";
+import { checkFiles } from "@guardianproject/proofmode";
+
+let subject = new Subject();
+
+const sendMessage = (type, message) => {
+  subject.next({ type, message });
+};
+
+const check = {
+  checkFiles: (files) => {
+    return checkFiles(files, sendMessage);
+  },
+  values: () => {
+    return Observable.from(subject);
+  },
+};
+
+expose(check);