Fix TypeScript errors not showing up in CI

packages/kbn-optimizer/src/integration_tests/basic_optimization.test.ts

@@ -261,7 +261,6 @@ const expectFileMatchesSnapshotWithCompression = (filePath: string, snapshotLabe
 
   // Verify the brotli variant matches
   expect(
-    // @ts-expect-error @types/node is missing the brotli functions
     Zlib.brotliDecompressSync(
       Fs.readFileSync(Path.resolve(MOCK_REPO_DIR, `${filePath}.br`))
     ).toString()

x-pack/plugins/actions/server/builtin_action_types/slack.ts

@@ -126,6 +126,7 @@ async function slackExecutor(
     // https://slack.dev/node-slack-sdk/webhook
     // node-slack-sdk use Axios inside :)
     const webhook = new IncomingWebhook(webhookUrl, {
+      // @ts-expect-error The types exposed by 'HttpsProxyAgent' isn't up to date with 'Agent'
       agent: proxyAgent,
     });
     result = await webhook.send(message);

x-pack/plugins/canvas/shareable_runtime/api/__tests__/shareable.test.tsx

@@ -15,7 +15,6 @@ jest.mock('../../supported_renderers');
 describe('Canvas Shareable Workpad API', () => {
   // Mock the AJAX load of the workpad.
   beforeEach(function () {
-    // @ts-expect-error Applying a global in Jest is alright.
     global.fetch = jest.fn().mockImplementation(() => {
       const p = new Promise((resolve, _reject) => {
         resolve({

x-pack/plugins/fleet/server/services/epm/registry/requests.ts

@@ -93,6 +93,7 @@ export function getFetchOptions(targetUrl: string): RequestInit | undefined {
   logger.debug(`Using ${proxyUrl} as proxy for ${targetUrl}`);
 
   return {
+    // @ts-expect-error The types exposed by 'HttpsProxyAgent' isn't up to date with 'Agent'
     agent: getProxyAgent({ proxyUrl, targetUrl }),
   };
 }

x-pack/plugins/reporting/server/browsers/chromium/driver/chromium_driver.ts

@@ -340,7 +340,6 @@ export class HeadlessChromiumDriver {
       hostname === conditions.hostname &&
       protocol === `${conditions.protocol}:` &&
       this._shouldUseCustomHeadersForPort(conditions, port) &&
-      // @ts-expect-error according to the types `pathname` is `string | undefined`, but it's actually `string | null`
       pathname.startsWith(`${conditions.basePath}/`)
     );
   }

x-pack/plugins/security_solution/public/management/common/routing.ts

@@ -32,9 +32,9 @@ type Exact<T, Shape> = T extends Shape ? ExactKeys<T, Shape> : never;
  * Ensures that when creating a URL query param string, that the given input strictly
  * matches the expected interface (guards against possibly leaking internal state)
  */
-const querystringStringify: <ExpectedType, ArgType>(
+const querystringStringify = <ExpectedType, ArgType>(
   params: Exact<ExpectedType, ArgType>
-) => string = querystring.stringify;
+): string => querystring.stringify((params as unknown) as querystring.ParsedUrlQueryInput);
 
 /** Make `selected_endpoint` required */
 type EndpointDetailsUrlProps = Omit<EndpointIndexUIQueryParams, 'selected_endpoint'> &

x-pack/plugins/security_solution/public/management/pages/endpoint_hosts/view/url_from_query_params.ts

@@ -11,7 +11,7 @@ import { EndpointIndexUIQueryParams } from '../types';
 import { AppLocation } from '../../../../../common/endpoint/types';
 
 export function urlFromQueryParams(queryParams: EndpointIndexUIQueryParams): Partial<AppLocation> {
-  const search = querystring.stringify(queryParams);
+  const search = querystring.stringify(queryParams as Record<string, string>);
   return {
     search,
   };

x-pack/plugins/security_solution/public/network/pages/details/index.test.tsx

@@ -26,8 +26,6 @@ import { NetworkDetails } from './index';
 type Action = 'PUSH' | 'POP' | 'REPLACE';
 const pop: Action = 'POP';
 
-type GlobalWithFetch = NodeJS.Global & { fetch: jest.Mock };
-
 jest.mock('react-router-dom', () => {
   const original = jest.requireActual('react-router-dom');
 
@@ -85,7 +83,7 @@ describe('Network Details', () => {
       indicesExist: false,
       indexPattern: {},
     });
-    (global as GlobalWithFetch).fetch = jest.fn().mockImplementationOnce(() =>
+    global.fetch = jest.fn().mockImplementationOnce(() =>
       Promise.resolve({
         ok: true,
         json: () => {

x-pack/plugins/uptime/public/components/overview/__tests__/synthetics_callout.test.tsx

@@ -19,7 +19,6 @@ describe('SyntheticsCallout', () => {
       setItem: setItemMock,
     };
 
-    //  @ts-expect-error replacing a call to localStorage we use for monitor list size
     global.localStorage = localStorageMock;
   });
 

x-pack/plugins/uptime/public/components/overview/monitor_list/__tests__/monitor_list.test.tsx

@@ -135,7 +135,6 @@ describe('MonitorList component', () => {
       setItem: jest.fn(),
     };
 
-    //  @ts-expect-error replacing a call to localStorage we use for monitor list size
     global.localStorage = localStorageMock;
   });