React UI: Fix build (#6312)

This fixes two TypeScript errors. Not sure why we didn't catch the
breakage in the PR CI tests... also, updating TypeScript just for good
measure.

Signed-off-by: Julius Volz <julius.volz@gmail.com>

web/ui/react-app/src/pages/TSDBStatus.tsx

@@ -53,7 +53,7 @@ function createTable(title: string, unit: string, stats: Array<Stats>) {
 const TSDBStatus: FC<RouteComponentProps & PathPrefixProps> = ({ pathPrefix }) => {
   const { response, error } = useFetch(`${pathPrefix}/api/v1/status/tsdb`);
   const headStats = () => {
-    const stats: TSDBMap = response && response.data;
+    const stats = response && (response.data as TSDBMap);
     if (error) {
       return (
         <Alert color="danger">

web/ui/react-app/src/pages/targets/ScrapePoolList.tsx

@@ -1,13 +1,18 @@
 import React, { FC } from 'react';
 import { FilterData } from './Filter';
 import { useFetch } from '../../utils/useFetch';
-import { ScrapePool, groupTargets } from './target';
+import { ScrapePool, groupTargets, Target } from './target';
 import ScrapePoolPanel from './ScrapePoolPanel';
 import PathPrefixProps from '../../PathPrefixProps';
 import { FontAwesomeIcon } from '@fortawesome/react-fontawesome';
 import { faSpinner } from '@fortawesome/free-solid-svg-icons';
 import { Alert } from 'reactstrap';
 
+interface TargetsResponse {
+  activeTargets: Target[];
+  droppedTargets: Target[];
+}
+
 interface ScrapePoolListProps {
   filter: FilterData;
 }
@@ -33,7 +38,7 @@ const ScrapePoolList: FC<ScrapePoolListProps & PathPrefixProps> = ({ filter, pat
       </Alert>
     );
   } else if (response && response.data) {
-    const { activeTargets } = response.data;
+    const { activeTargets } = response.data as TargetsResponse;
     const targetGroups = groupTargets(activeTargets);
     return (
       <>

web/ui/react-app/yarn.lock

@@ -10657,9 +10657,9 @@ typedarray@^0.0.6:
   integrity sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=
 
 typescript@^3.3.3:
-  version "3.6.4"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.6.4.tgz#b18752bb3792bc1a0281335f7f6ebf1bbfc5b91d"
-  integrity sha512-unoCll1+l+YK4i4F8f22TaNVPRHcD9PA3yCuZ8g5e0qGqlVlJ/8FSateOLLSagn+Yg5+ZwuPkL8LFUc0Jcvksg==
+  version "3.7.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.7.2.tgz#27e489b95fa5909445e9fef5ee48d81697ad18fb"
+  integrity sha512-ml7V7JfiN2Xwvcer+XAf2csGO1bPBdRbFCkYBczNZggrBZ9c7G3riSUeJmqEU5uOtXNPMhE3n+R4FA/3YOAWOQ==
 
 ua-parser-js@^0.7.18:
   version "0.7.20"