Move to websocket for requests to signal server

ts/util/explodePromise.ts

@@ -0,0 +1,25 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+export function explodePromise<T>(): {
+  promise: Promise<T>;
+  resolve: (value: T) => void;
+  reject: (error: Error) => void;
+} {
+  let resolve: (value: T) => void;
+  let reject: (error: Error) => void;
+
+  const promise = new Promise<T>((innerResolve, innerReject) => {
+    resolve = innerResolve;
+    reject = innerReject;
+  });
+
+  return {
+    promise,
+    // Typescript thinks that resolve and reject can be undefined here.
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+    resolve: resolve!,
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+    reject: reject!,
+  };
+}