diff --git a/.eslintrc.json b/.eslintrc.json
index a2753f03ab..77632591a1 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -145,6 +145,7 @@
         {
             "files": ["**/*.ts"],
             "extends": [
+                "plugin:@typescript-eslint/recommended",
                 "plugin:@typescript-eslint/recommended-requiring-type-checking",
                 "plugin:import/typescript"
             ],
@@ -164,7 +165,6 @@
             "rules": {
                 // Disable base rule to avoid conflict
                 "no-duplicate-imports": "off",
-                "no-unused-vars": "off",
                 "no-useless-constructor": "off",
                 "no-use-before-define": "off",
 
@@ -178,6 +178,7 @@
                 "@typescript-eslint/member-ordering": "error",
                 "@typescript-eslint/no-duplicate-imports": "error",
                 "@typescript-eslint/no-extraneous-class": "error",
+                "@typescript-eslint/no-non-null-assertion": "off",
                 "@typescript-eslint/no-parameter-properties": "error",
                 "@typescript-eslint/no-unnecessary-qualifier": "error",
                 "@typescript-eslint/no-unsafe-argument": "off",
diff --git a/web/e2e-tests/stream_create.test.ts b/web/e2e-tests/stream_create.test.ts
index 14e8fd1e89..b62a76d39b 100644
--- a/web/e2e-tests/stream_create.test.ts
+++ b/web/e2e-tests/stream_create.test.ts
@@ -22,10 +22,7 @@ async function await_user_hidden(page: Page, name: string): Promise<void> {
 
 async function add_user_to_stream(page: Page, name: string): Promise<void> {
     const user_id = await common.get_user_id_from_name(page, name);
-    await page.evaluate(
-        (user_id: Number) => zulip_test.add_user_id_to_new_stream(user_id),
-        user_id,
-    );
+    await page.evaluate((user_id) => zulip_test.add_user_id_to_new_stream(user_id), user_id);
     await await_user_visible(page, name);
 }
 
diff --git a/web/src/global.d.ts b/web/src/global.d.ts
index 5bdd7711fb..f40ae0dc17 100644
--- a/web/src/global.d.ts
+++ b/web/src/global.d.ts
@@ -3,7 +3,7 @@
 // remove each declaration when the corresponding module is migrated
 // to TS.
 
-declare let zulip_test: any;
+declare let zulip_test: any; // eslint-disable-line @typescript-eslint/no-explicit-any
 
 interface JQuery {
     expectOne(): JQuery;
diff --git a/web/src/timerender.ts b/web/src/timerender.ts
index fe343c048f..d178fe9f28 100644
--- a/web/src/timerender.ts
+++ b/web/src/timerender.ts
@@ -367,7 +367,7 @@ export function stringify_time(time: number | Date): string {
     return get_localized_date_or_time_for_format(time, "time");
 }
 
-export function format_time_modern(time: number | Date, today = new Date()): String {
+export function format_time_modern(time: number | Date, today = new Date()): string {
     const hours = differenceInHours(today, time);
     const days_old = differenceInCalendarDays(today, time);
 
diff --git a/web/src/ui_report.ts b/web/src/ui_report.ts
index 3420ac56e4..55e29888ff 100644
--- a/web/src/ui_report.ts
+++ b/web/src/ui_report.ts
@@ -94,7 +94,7 @@ export function show_error($target: JQuery): void {
 export function loading(
     response_html: string,
     $status_box: JQuery,
-    successfully_loaded: boolean = false,
+    successfully_loaded = false,
 ): void {
     $status_box.find(".alert-content").html(response_html);
     if (!successfully_loaded) {
diff --git a/web/src/ui_util.ts b/web/src/ui_util.ts
index bf39984512..c3a0960d8e 100644
--- a/web/src/ui_util.ts
+++ b/web/src/ui_util.ts
@@ -49,7 +49,7 @@ export function update_unread_count_in_dom($unread_count_elem: JQuery, count: nu
 
 export function update_unread_mention_info_in_dom(
     $unread_mention_info_elem: JQuery,
-    stream_has_any_unread_mention_messages: Boolean,
+    stream_has_any_unread_mention_messages: boolean,
 ): void {
     const $unread_mention_info_span = $unread_mention_info_elem.find(".unread_mention_info");
     if (!stream_has_any_unread_mention_messages) {
diff --git a/web/src/util.ts b/web/src/util.ts
index c8e750684a..0f62aeaa27 100644
--- a/web/src/util.ts
+++ b/web/src/util.ts
@@ -347,7 +347,7 @@ export function filter_by_word_prefix_match<T>(
     items: T[],
     search_term: string,
     item_to_text: (item: T) => string,
-    word_separator_regex: RegExp = /\s/,
+    word_separator_regex = /\s/,
 ): T[] {
     if (search_term === "") {
         return items;