diff --git a/web/debug-require-webpack-plugin.ts b/web/debug-require-webpack-plugin.ts
index d19fbb15a5..c3c8b8b6fc 100644
--- a/web/debug-require-webpack-plugin.ts
+++ b/web/debug-require-webpack-plugin.ts
@@ -60,16 +60,17 @@ export default class DebugRequirePlugin implements WebpackPluginInstance {
             "DebugRequirePlugin",
             async ({normalModuleFactory}) => {
                 const resolver = normalModuleFactory.getResolver("normal");
-                debugRequirePath = await new Promise((resolve) =>
+                debugRequirePath = await new Promise((resolve) => {
                     resolver.resolve(
                         {},
                         __dirname,
                         "./debug-require",
                         {},
-                        (err?: Error | null, result?: string | false) =>
-                            resolve(err ? false : result!),
-                    ),
-                );
+                        (err?: Error | null, result?: string | false) => {
+                            resolve(err ? false : result!);
+                        },
+                    );
+                });
             },
         );
 
diff --git a/web/e2e-tests/compose.test.ts b/web/e2e-tests/compose.test.ts
index 648fc115d7..60d33ecf5d 100644
--- a/web/e2e-tests/compose.test.ts
+++ b/web/e2e-tests/compose.test.ts
@@ -112,10 +112,9 @@ async function test_narrow_to_private_messages_with_cordelia(page: Page): Promis
     const you_and_cordelia_selector =
         '*[data-tippy-content="Go to direct messages with Cordelia, Lear\'s daughter"]';
     // For some unknown reason page.click() isn't working here.
-    await page.evaluate(
-        (selector: string) => document.querySelector<HTMLElement>(selector)!.click(),
-        you_and_cordelia_selector,
-    );
+    await page.evaluate((selector: string) => {
+        document.querySelector<HTMLElement>(selector)!.click();
+    }, you_and_cordelia_selector);
     const cordelia_user_id = await common.get_user_id_from_name(page, "Cordelia, Lear's daughter");
     const pm_list_selector = `li[data-user-ids-string="${cordelia_user_id}"].dm-list-item.active-sub-filter`;
     await page.waitForSelector(pm_list_selector, {visible: true});
diff --git a/web/e2e-tests/lib/common.ts b/web/e2e-tests/lib/common.ts
index bc8cd64b90..1b16563ee2 100644
--- a/web/e2e-tests/lib/common.ts
+++ b/web/e2e-tests/lib/common.ts
@@ -269,7 +269,9 @@ export async function log_in(
         password: credentials.password,
     };
     await fill_form(page, "form#login_form", params);
-    await page.$eval("form#login_form", (form) => form.submit());
+    await page.$eval("form#login_form", (form) => {
+        form.submit();
+    });
 
     await page.waitForSelector("#inbox-main", {visible: true});
 }
diff --git a/web/e2e-tests/realm-creation.test.ts b/web/e2e-tests/realm-creation.test.ts
index dac3d89bf7..5ca0777281 100644
--- a/web/e2e-tests/realm-creation.test.ts
+++ b/web/e2e-tests/realm-creation.test.ts
@@ -15,11 +15,15 @@ async function realm_creation_tests(page: Page): Promise<void> {
     await page.waitForSelector("#email");
     await page.type("#email", email);
     await page.type("#id_team_name", organization_name);
-    await page.$eval("input#realm_in_root_domain", (el) => el.click());
+    await page.$eval("input#realm_in_root_domain", (el) => {
+        el.click();
+    });
 
     await Promise.all([
         page.waitForNavigation(),
-        page.$eval("form#create_realm", (form) => form.submit()),
+        page.$eval("form#create_realm", (form) => {
+            form.submit();
+        }),
     ]);
 
     // Make sure confirmation email is sent.
@@ -59,7 +63,9 @@ async function realm_creation_tests(page: Page): Promise<void> {
     // For some reason, page.click() does not work this for particular checkbox
     // so use page.$eval here to call the .click method in the browser.
     await common.fill_form(page, "#registration", params);
-    await page.$eval("form#registration", (form) => form.submit());
+    await page.$eval("form#registration", (form) => {
+        form.submit();
+    });
 
     // Check if realm is created and user is logged in by checking if
     // element of id `lightbox_overlay` exists.
diff --git a/web/e2e-tests/realm-playground.test.ts b/web/e2e-tests/realm-playground.test.ts
index b80699ae16..7e03af2dd4 100644
--- a/web/e2e-tests/realm-playground.test.ts
+++ b/web/e2e-tests/realm-playground.test.ts
@@ -20,7 +20,9 @@ async function _add_playground_and_return_status(page: Page, payload: Playground
     await common.fill_form(page, "form.admin-playground-form", payload);
     // Not sure why, but page.click() doesn't seem to always click the submit button.
     // So we resort to using eval with the button ID instead.
-    await page.$eval("button#submit_playground_button", (el) => el.click());
+    await page.$eval("button#submit_playground_button", (el) => {
+        el.click();
+    });
 
     // We return the success/failure status message back to the caller.
     await page.waitForSelector(admin_playground_status_selector, {visible: true});
diff --git a/web/e2e-tests/user-status.test.ts b/web/e2e-tests/user-status.test.ts
index f89a923a55..fa11dfb7c7 100644
--- a/web/e2e-tests/user-status.test.ts
+++ b/web/e2e-tests/user-status.test.ts
@@ -17,9 +17,9 @@ async function open_set_user_status_modal(page: Page): Promise<void> {
     });
     await page.waitForSelector(".user_popover_email", {visible: true});
     // We are using evaluate to click because it is very hard to detect if the user info popover has opened.
-    await page.evaluate(() =>
-        document.querySelector<HTMLAnchorElement>(".update_status_text")!.click(),
-    );
+    await page.evaluate(() => {
+        document.querySelector<HTMLAnchorElement>(".update_status_text")!.click();
+    });
 
     // Wait for the modal to completely open.
     await common.wait_for_micromodal_to_open(page);
diff --git a/web/src/attachments_ui.ts b/web/src/attachments_ui.ts
index e265fac3de..05530fbd5d 100644
--- a/web/src/attachments_ui.ts
+++ b/web/src/attachments_ui.ts
@@ -99,8 +99,9 @@ function delete_attachments(attachment: string, file_name: string): void {
         html_submit_button: $t_html({defaultMessage: "Delete"}),
         id: "confirm_delete_file_modal",
         focus_submit_on_open: true,
-        on_click: () =>
-            dialog_widget.submit_api_request(channel.del, "/json/attachments/" + attachment),
+        on_click() {
+            dialog_widget.submit_api_request(channel.del, "/json/attachments/" + attachment);
+        },
         loading_spinner: true,
     });
 }
diff --git a/web/src/avatar.ts b/web/src/avatar.ts
index 608774b7c5..57d94c4dee 100644
--- a/web/src/avatar.ts
+++ b/web/src/avatar.ts
@@ -83,7 +83,7 @@ export function build_user_avatar_widget(upload_function: UploadFunction): void
     }
 
     if (!settings_data.user_can_change_avatar) {
-        return undefined;
+        return;
     }
 
     $("#user-avatar-upload-widget .image-delete-button").on("click", (e) => {
@@ -116,7 +116,7 @@ export function build_user_avatar_widget(upload_function: UploadFunction): void
         });
     });
 
-    return upload_widget.build_direct_upload_widget(
+    upload_widget.build_direct_upload_widget(
         get_file_input,
         $("#user-avatar-upload-widget .image_file_input_error").expectOne(),
         $("#user-avatar-upload-widget .image_upload_button").expectOne(),
diff --git a/web/src/billing/billing.ts b/web/src/billing/billing.ts
index e72919a808..052c74469c 100644
--- a/web/src/billing/billing.ts
+++ b/web/src/billing/billing.ts
@@ -184,11 +184,12 @@ export function initialize(): void {
             "planchange",
             [],
             "PATCH",
-            () =>
+            () => {
                 window.location.replace(
                     `${billing_base_url}/upgrade/?success_message=` +
                         encodeURIComponent("Your plan is no longer scheduled for an upgrade."),
-                ),
+                );
+            },
         );
         e.preventDefault();
     });
@@ -216,11 +217,12 @@ export function initialize(): void {
             "planchange",
             [],
             "PATCH",
-            () =>
+            () => {
                 window.location.replace(
                     `${billing_base_url}/billing/?success_message=` +
                         encodeURIComponent("Your plan has been canceled and will not renew."),
-                ),
+                );
+            },
         );
         e.preventDefault();
     });
@@ -231,13 +233,14 @@ export function initialize(): void {
             "planchange",
             [],
             "PATCH",
-            () =>
+            () => {
                 window.location.replace(
                     `${billing_base_url}/billing/?success_message=` +
                         encodeURIComponent(
                             "Your plan has been reactivated and will renew automatically.",
                         ),
-                ),
+                );
+            },
         );
         e.preventDefault();
     });
@@ -248,13 +251,14 @@ export function initialize(): void {
             "planchange",
             [],
             "PATCH",
-            () =>
+            () => {
                 window.location.replace(
                     `${billing_base_url}/billing/?success_message=` +
                         encodeURIComponent(
                             "Your plan will be canceled at the end of the trial. Your card will not be charged.",
                         ),
-                ),
+                );
+            },
         );
         e.preventDefault();
     });
diff --git a/web/src/blueslip.ts b/web/src/blueslip.ts
index 899ff1489e..6a6a4d5949 100644
--- a/web/src/blueslip.ts
+++ b/web/src/blueslip.ts
@@ -31,7 +31,7 @@ function make_logger_func(name: "debug" | "log" | "info" | "warn" | "error") {
         }
 
         if (console[name] !== undefined) {
-            return console[name](...args);
+            console[name](...args);
         }
     };
 }
diff --git a/web/src/feedback_widget.ts b/web/src/feedback_widget.ts
index a33265e88f..dca3aa76f5 100644
--- a/web/src/feedback_widget.ts
+++ b/web/src/feedback_widget.ts
@@ -56,7 +56,9 @@ const animate = {
             return;
         }
 
-        setTimeout(() => animate.maybe_close(), 100);
+        setTimeout(() => {
+            animate.maybe_close();
+        }, 100);
     },
     fadeOut() {
         if (!meta.opened) {
@@ -86,7 +88,9 @@ const animate = {
         if (meta.$container) {
             meta.$container.addClass("show-feedback-container");
             meta.opened = true;
-            setTimeout(() => animate.maybe_close(), 100);
+            setTimeout(() => {
+                animate.maybe_close();
+            }, 100);
         }
     },
 };
diff --git a/web/src/input_pill.ts b/web/src/input_pill.ts
index 72c8f50c9f..04149aca71 100644
--- a/web/src/input_pill.ts
+++ b/web/src/input_pill.ts
@@ -290,7 +290,8 @@ export function create<T>(opts: InputPillCreateOptions<T>): InputPillContainer<T
 
         createPillonPaste() {
             if (store.createPillonPaste !== undefined) {
-                return store.createPillonPaste();
+                store.createPillonPaste();
+                return undefined;
             }
             return true;
         },
diff --git a/web/src/realm_icon.ts b/web/src/realm_icon.ts
index eabea47d39..c7b5fd25f3 100644
--- a/web/src/realm_icon.ts
+++ b/web/src/realm_icon.ts
@@ -11,7 +11,7 @@ export function build_realm_icon_widget(upload_function: UploadFunction): void {
     };
 
     if (!page_params.is_admin) {
-        return undefined;
+        return;
     }
     if (page_params.realm_icon_source === "G") {
         $("#realm-icon-upload-widget .image-delete-button").hide();
@@ -26,7 +26,7 @@ export function build_realm_icon_widget(upload_function: UploadFunction): void {
         });
     });
 
-    return upload_widget.build_direct_upload_widget(
+    upload_widget.build_direct_upload_widget(
         get_file_input,
         $("#realm-icon-upload-widget .image_file_input_error").expectOne(),
         $("#realm-icon-upload-widget .image_upload_button").expectOne(),
diff --git a/web/src/realm_logo.ts b/web/src/realm_logo.ts
index 7515e37b2d..d957ddb56d 100644
--- a/web/src/realm_logo.ts
+++ b/web/src/realm_logo.ts
@@ -26,7 +26,7 @@ export function build_realm_logo_widget(upload_function: UploadFunction, is_nigh
     };
 
     if (!page_params.is_admin) {
-        return undefined;
+        return;
     }
 
     if (logo_source === "D") {
@@ -45,7 +45,7 @@ export function build_realm_logo_widget(upload_function: UploadFunction, is_nigh
         });
     });
 
-    return upload_widget.build_direct_upload_widget(
+    upload_widget.build_direct_upload_widget(
         get_file_input,
         $file_input_error_elem.expectOne(),
         $upload_button_elem.expectOne(),
diff --git a/web/src/settings_emoji.ts b/web/src/settings_emoji.ts
index ae40d106bf..a6689ab9fb 100644
--- a/web/src/settings_emoji.ts
+++ b/web/src/settings_emoji.ts
@@ -288,7 +288,9 @@ function show_modal(): void {
                 confirm_dialog.launch({
                     html_heading: $t_html({defaultMessage: "Override default emoji?"}),
                     html_body,
-                    on_click: () => submit_custom_emoji_request(formData),
+                    on_click() {
+                        submit_custom_emoji_request(formData);
+                    },
                 });
             });
         } else {
@@ -335,7 +337,9 @@ export function set_up(): void {
             html_heading: $t_html({defaultMessage: "Deactivate custom emoji?"}),
             html_body,
             id: "confirm_deactivate_custom_emoji_modal",
-            on_click: () => dialog_widget.submit_api_request(channel.del, url, {}, opts),
+            on_click() {
+                dialog_widget.submit_api_request(channel.del, url, {}, opts);
+            },
             loading_spinner: true,
         });
     });
diff --git a/web/src/settings_exports.ts b/web/src/settings_exports.ts
index f96793d4be..390f194c15 100644
--- a/web/src/settings_exports.ts
+++ b/web/src/settings_exports.ts
@@ -155,7 +155,9 @@ export function set_up(): void {
         confirm_dialog.launch({
             html_heading: $t_html({defaultMessage: "Delete data export?"}),
             html_body,
-            on_click: () => dialog_widget.submit_api_request(channel.del, url),
+            on_click() {
+                dialog_widget.submit_api_request(channel.del, url);
+            },
             loading_spinner: true,
         });
     });