chore(ui): migrate more code to typescript

ui/src/Common/Fetch.ts

@@ -0,0 +1,46 @@
+import merge from "lodash.merge";
+
+import promiseRetry from "promise-retry";
+
+const CommonOptions = {
+  mode: "cors",
+  credentials: "include",
+  redirect: "follow",
+};
+
+const FetchRetryConfig = {
+  retries: 9,
+  minTimeout: 2000,
+  maxTimeout: 5000,
+};
+
+type PreRetryCallback = (number: number) => void;
+
+const FetchGet = async (
+  uri: string,
+  options: RequestInit,
+  beforeRetry: PreRetryCallback
+) =>
+  await promiseRetry(
+    (retry, number) =>
+      fetch(
+        uri,
+        merge(
+          {},
+          {
+            method: "GET",
+          },
+          CommonOptions,
+          {
+            mode: number <= FetchRetryConfig.retries ? "cors" : "no-cors",
+          },
+          options
+        )
+      ).catch((err) => {
+        beforeRetry && beforeRetry(number);
+        return retry(err);
+      }),
+    FetchRetryConfig
+  );
+
+export { CommonOptions, FetchGet, FetchRetryConfig };