diff --git a/web/src/debug.ts b/web/src/debug.ts
index 8854eff4fe..1b933b54ce 100644
--- a/web/src/debug.ts
+++ b/web/src/debug.ts
@@ -101,7 +101,7 @@ export class IterationProfiler {
         if (diff > 1) {
             this.sections.set(
                 "_rest_of_iteration",
-                (this.sections.get("_rest_of_iteration") || 0) + diff,
+                (this.sections.get("_rest_of_iteration") ?? 0) + diff,
             );
         }
         this.last_time = now;
@@ -109,7 +109,7 @@ export class IterationProfiler {
 
     section(label: string): void {
         const now = window.performance.now();
-        this.sections.set(label, (this.sections.get(label) || 0) + (now - this.last_time));
+        this.sections.set(label, (this.sections.get(label) ?? 0) + (now - this.last_time));
         this.last_time = now;
     }
 
diff --git a/web/src/dialog_widget.ts b/web/src/dialog_widget.ts
index ec708b30bc..c6a453b6cf 100644
--- a/web/src/dialog_widget.ts
+++ b/web/src/dialog_widget.ts
@@ -121,7 +121,7 @@ export function launch(conf: WidgetConfig): void {
     // * loading_spinner: Whether to show a loading spinner inside the
     //   submit button when clicked.
 
-    const html_submit_button = conf.html_submit_button || $t_html({defaultMessage: "Save changes"});
+    const html_submit_button = conf.html_submit_button ?? $t_html({defaultMessage: "Save changes"});
     const html = render_dialog_widget({
         heading_text: conf.html_heading,
         link: conf.help_link,
diff --git a/web/src/emoji.ts b/web/src/emoji.ts
index 52d34a7349..b7edf895cf 100644
--- a/web/src/emoji.ts
+++ b/web/src/emoji.ts
@@ -204,7 +204,7 @@ function build_emojis_by_name({
                 const emoji_dict: EmojiDict = {
                     name: emoji_name,
                     display_name: emoji_name,
-                    aliases: default_emoji_aliases.get(codepoint) || [],
+                    aliases: default_emoji_aliases.get(codepoint) ?? [],
                     is_realm_emoji: false,
                     emoji_code: codepoint,
                     has_reacted: false,
diff --git a/web/src/keydown_util.ts b/web/src/keydown_util.ts
index aa032773be..310728c644 100644
--- a/web/src/keydown_util.ts
+++ b/web/src/keydown_util.ts
@@ -37,6 +37,6 @@ export function is_enter_event(event: JQuery.KeyDownEvent): boolean {
     // phonetic input method like ZhuYin in a character-based
     // language. See #22062 for details. Further reading:
     // https://developer.mozilla.org/en-US/docs/Glossary/Input_method_editor
-    const isComposing: boolean = event.originalEvent?.isComposing || false;
+    const isComposing = event.originalEvent?.isComposing ?? false;
     return !isComposing && event.key === "Enter";
 }
diff --git a/web/src/overlays.ts b/web/src/overlays.ts
index 6daf4de06e..4625024a0e 100644
--- a/web/src/overlays.ts
+++ b/web/src/overlays.ts
@@ -110,7 +110,7 @@ export function open_overlay(opts: OverlayOptions): void {
     if (active_overlay || open_overlay_name) {
         blueslip.error(
             `Programming error - trying to open ${opts.name} before closing ${
-                open_overlay_name || "undefined"
+                open_overlay_name ?? "undefined"
             }`,
         );
 
@@ -255,7 +255,7 @@ export function close_overlay(name: string): void {
     call_hooks(pre_close_hooks);
 
     if (name !== open_overlay_name) {
-        blueslip.error(`Trying to close ${name} when ${open_overlay_name || "undefined"} is open.`);
+        blueslip.error(`Trying to close ${name} when ${open_overlay_name ?? "undefined"} is open.`);
         return;
     }
 
@@ -304,7 +304,7 @@ export function close_modal(modal_id: string, conf: Pick<ModalConfig, "on_hidden
 
     if (active_modal() !== `#${CSS.escape(modal_id)}`) {
         blueslip.error(
-            `Trying to close ${modal_id} modal when ${active_modal() || "undefined"} is open.`,
+            `Trying to close ${modal_id} modal when ${active_modal() ?? "undefined"} is open.`,
         );
         return;
     }
@@ -335,7 +335,7 @@ export function close_active_modal(): void {
     }
 
     const $micromodal = $(".micromodal.modal--open");
-    Micromodal.close(`${CSS.escape($micromodal.attr("id") || "")}`);
+    Micromodal.close(`${CSS.escape($micromodal.attr("id") ?? "")}`);
 }
 
 export function close_for_hash_change(): void {
diff --git a/web/src/portico/header.ts b/web/src/portico/header.ts
index 1314f05ff5..630b1a61eb 100644
--- a/web/src/portico/header.ts
+++ b/web/src/portico/header.ts
@@ -26,7 +26,7 @@ $(() => {
     // In case user presses `back` with menu open.
     // See https://github.com/zulip/zulip/pull/24301#issuecomment-1418547337.
     if ($(".top-menu-tab-input:checked").length === 1) {
-        const sub_menu_height = $(".top-menu-tab-input:checked ~ .top-menu-submenu").height() || 0;
+        const sub_menu_height = $(".top-menu-tab-input:checked ~ .top-menu-submenu").height() ?? 0;
         $("#top-menu-submenu-backdrop").css("height", sub_menu_height + 16);
     }
 
diff --git a/web/src/portico/team.ts b/web/src/portico/team.ts
index 3580f931a1..d05c2e2f08 100644
--- a/web/src/portico/team.ts
+++ b/web/src/portico/team.ts
@@ -48,7 +48,7 @@ const loaded_repos: string[] = [];
 function calculate_total_commits(contributor: Contributor): number {
     let commits = 0;
     for (const repo_name of all_repository_names) {
-        commits += contributor[repo_name] || 0;
+        commits += contributor[repo_name] ?? 0;
     }
     return commits;
 }
@@ -132,11 +132,11 @@ export default function render_tabs(contributors: Contributor[]): void {
 
         $(`#${CSS.escape(tab_name)}`).on("click", () => {
             if (!loaded_repos.includes(repo_name)) {
-                const filtered_by_repo = contributors_list.filter((c) => c[repo_name] || 0);
+                const filtered_by_repo = contributors_list.filter((c) => c[repo_name] ?? 0);
                 const html = filtered_by_repo
                     .sort((a, b) => {
-                        const a_commits = a[repo_name] || 0;
-                        const b_commits = b[repo_name] || 0;
+                        const a_commits = a[repo_name] ?? 0;
+                        const b_commits = b[repo_name] ?? 0;
                         return a_commits < b_commits ? 1 : a_commits > b_commits ? -1 : 0;
                     })
                     .map((c) =>
@@ -153,7 +153,7 @@ export default function render_tabs(contributors: Contributor[]): void {
                 $(`#tab-${CSS.escape(tab_name)} .contributors-grid`).html(html);
                 const contributor_count = filtered_by_repo.length;
                 const hundred_plus_contributor_count = filtered_by_repo.filter((c) => {
-                    const commits = c[repo_name] || 0;
+                    const commits = c[repo_name] ?? 0;
                     return commits >= 100;
                 }).length;
                 const repo_url = `https://github.com/zulip/${repo_name}`;
diff --git a/web/src/sentry.ts b/web/src/sentry.ts
index 6009a34195..8b46f33565 100644
--- a/web/src/sentry.ts
+++ b/web/src/sentry.ts
@@ -46,7 +46,7 @@ if (page_params.server_sentry_dsn) {
 
     Sentry.init({
         dsn: page_params.server_sentry_dsn,
-        environment: page_params.server_sentry_environment || "development",
+        environment: page_params.server_sentry_environment ?? "development",
         tunnel: "/error_tracing",
 
         release: "zulip-server@" + ZULIP_VERSION,
@@ -56,8 +56,8 @@ if (page_params.server_sentry_dsn) {
             }),
         ],
         allowUrls: url_matches,
-        sampleRate: page_params.server_sentry_sample_rate || 0,
-        tracesSampleRate: page_params.server_sentry_trace_rate || 0,
+        sampleRate: page_params.server_sentry_sample_rate ?? 0,
+        tracesSampleRate: page_params.server_sentry_trace_rate ?? 0,
         initialScope: {
             tags: {
                 realm: sentry_key,
diff --git a/web/src/spoilers.ts b/web/src/spoilers.ts
index dbce690aa3..081ee51d86 100644
--- a/web/src/spoilers.ts
+++ b/web/src/spoilers.ts
@@ -1,7 +1,7 @@
 import $ from "jquery";
 
 function collapse_spoiler($spoiler: JQuery): void {
-    const spoiler_height = $spoiler.height() || 0;
+    const spoiler_height = $spoiler.height() ?? 0;
 
     // Set height to rendered height on next frame, then to zero on following
     // frame to allow CSS transition animation to work
diff --git a/web/src/typing_data.ts b/web/src/typing_data.ts
index 7048a9d0bb..3ad98fb591 100644
--- a/web/src/typing_data.ts
+++ b/web/src/typing_data.ts
@@ -18,7 +18,7 @@ function get_key(group: number[]): string {
 
 export function add_typist(group: number[], typist: number): void {
     const key = get_key(group);
-    const current = typist_dct.get(key) || [];
+    const current = typist_dct.get(key) ?? [];
     if (!current.includes(typist)) {
         current.push(typist);
     }
@@ -27,7 +27,7 @@ export function add_typist(group: number[], typist: number): void {
 
 export function remove_typist(group: number[], typist: number): boolean {
     const key = get_key(group);
-    let current = typist_dct.get(key) || [];
+    let current = typist_dct.get(key) ?? [];
 
     if (!current.includes(typist)) {
         return false;
@@ -41,7 +41,7 @@ export function remove_typist(group: number[], typist: number): boolean {
 
 export function get_group_typists(group: number[]): number[] {
     const key = get_key(group);
-    const user_ids = typist_dct.get(key) || [];
+    const user_ids = typist_dct.get(key) ?? [];
     return muted_users.filter_muted_user_ids(user_ids);
 }
 
diff --git a/web/webpack.config.ts b/web/webpack.config.ts
index ff167c85a3..e8d54393f3 100644
--- a/web/webpack.config.ts
+++ b/web/webpack.config.ts
@@ -198,7 +198,7 @@ export default (
         },
         plugins: [
             new DefinePlugin({
-                ZULIP_VERSION: JSON.stringify(env.ZULIP_VERSION || "development"),
+                ZULIP_VERSION: JSON.stringify(env.ZULIP_VERSION ?? "development"),
             }),
             new DebugRequirePlugin(),
             new BundleTracker({