diff --git a/.eslintrc.json b/.eslintrc.json
index 50a1da790e..6e46a9573c 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -38,12 +38,7 @@
             }
         ],
         "import/unambiguous": "error",
-        "new-cap": [
-            "error",
-            {
-                "capIsNew": false
-            }
-        ],
+        "new-cap": "error",
         "no-alert": "error",
         "no-array-constructor": "error",
         "no-bitwise": "error",
diff --git a/frontend_tests/node_tests/billing_helpers.js b/frontend_tests/node_tests/billing_helpers.js
index 64d445fc97..59e17dc961 100644
--- a/frontend_tests/node_tests/billing_helpers.js
+++ b/frontend_tests/node_tests/billing_helpers.js
@@ -3,7 +3,7 @@
 const {strict: assert} = require("assert");
 const fs = require("fs");
 
-const JQuery = require("jquery");
+const jQueryFactory = require("jquery");
 const {JSDOM} = require("jsdom");
 
 const {set_global, zrequire} = require("../zjsunit/namespace");
@@ -12,7 +12,7 @@ const {make_zjquery} = require("../zjsunit/zjquery");
 
 const template = fs.readFileSync("templates/corporate/upgrade.html", "utf-8");
 const dom = new JSDOM(template, {pretendToBeVisual: true});
-const jquery = JQuery(dom.window);
+const jquery = jQueryFactory(dom.window);
 
 set_global("$", make_zjquery());
 set_global("page_params", {});
diff --git a/frontend_tests/node_tests/copy_and_paste.js b/frontend_tests/node_tests/copy_and_paste.js
index 55c882c257..cbf5098701 100644
--- a/frontend_tests/node_tests/copy_and_paste.js
+++ b/frontend_tests/node_tests/copy_and_paste.js
@@ -37,7 +37,7 @@ const createPasteEvent = function () {
     const clipboardData = new DataTransfer();
     const pasteEvent = new window.Event("paste");
     pasteEvent.clipboardData = clipboardData;
-    return $.Event(pasteEvent);
+    return new $.Event(pasteEvent);
 };
 
 run_test("paste_handler", () => {
diff --git a/frontend_tests/node_tests/hashchange.js b/frontend_tests/node_tests/hashchange.js
index 1b39f11e5c..17998c0a08 100644
--- a/frontend_tests/node_tests/hashchange.js
+++ b/frontend_tests/node_tests/hashchange.js
@@ -173,7 +173,7 @@ run_test("hash_interactions", () => {
     ]);
 
     helper.clear_events();
-    $(window).trigger($.Event("hashchange", {}));
+    $(window).trigger("hashchange");
     helper.assert_events([
         "overlays.close_for_hash_change",
         "message_viewport.stop_auto_scrolling",
@@ -185,7 +185,7 @@ run_test("hash_interactions", () => {
     window.location.hash = "#narrow/stream/Denmark";
 
     helper.clear_events();
-    $(window).trigger($.Event("hashchange", {}));
+    $(window).trigger("hashchange");
     helper.assert_events([
         "overlays.close_for_hash_change",
         "message_viewport.stop_auto_scrolling",
@@ -199,7 +199,7 @@ run_test("hash_interactions", () => {
     window.location.hash = "#narrow";
 
     helper.clear_events();
-    $(window).trigger($.Event("hashchange", {}));
+    $(window).trigger("hashchange");
     helper.assert_events([
         "overlays.close_for_hash_change",
         "message_viewport.stop_auto_scrolling",
@@ -213,43 +213,43 @@ run_test("hash_interactions", () => {
     window.location.hash = "#streams/whatever";
 
     helper.clear_events();
-    $(window).trigger($.Event("hashchange", {}));
+    $(window).trigger("hashchange");
     helper.assert_events(["overlays.close_for_hash_change", "subs.launch"]);
 
     window.location.hash = "#keyboard-shortcuts/whatever";
 
     helper.clear_events();
-    $(window).trigger($.Event("hashchange", {}));
+    $(window).trigger("hashchange");
     helper.assert_events(["overlays.close_for_hash_change", "info: keyboard-shortcuts"]);
 
     window.location.hash = "#message-formatting/whatever";
 
     helper.clear_events();
-    $(window).trigger($.Event("hashchange", {}));
+    $(window).trigger("hashchange");
     helper.assert_events(["overlays.close_for_hash_change", "info: message-formatting"]);
 
     window.location.hash = "#search-operators/whatever";
 
     helper.clear_events();
-    $(window).trigger($.Event("hashchange", {}));
+    $(window).trigger("hashchange");
     helper.assert_events(["overlays.close_for_hash_change", "info: search-operators"]);
 
     window.location.hash = "#drafts";
 
     helper.clear_events();
-    $(window).trigger($.Event("hashchange", {}));
+    $(window).trigger("hashchange");
     helper.assert_events(["overlays.close_for_hash_change", "drafts.launch"]);
 
     window.location.hash = "#settings/alert-words";
 
     helper.clear_events();
-    $(window).trigger($.Event("hashchange", {}));
+    $(window).trigger("hashchange");
     helper.assert_events(["overlays.close_for_hash_change", "settings.launch"]);
 
     window.location.hash = "#organization/user-list-admin";
 
     helper.clear_events();
-    $(window).trigger($.Event("hashchange", {}));
+    $(window).trigger("hashchange");
     helper.assert_events(["overlays.close_for_hash_change", "admin.launch"]);
 
     let called_back;
diff --git a/frontend_tests/node_tests/search.js b/frontend_tests/node_tests/search.js
index 19c0fd3c8e..dc0cc29b09 100644
--- a/frontend_tests/node_tests/search.js
+++ b/frontend_tests/node_tests/search.js
@@ -208,7 +208,7 @@ run_test("initialize", () => {
     };
     search_query_box.val("test string");
     narrow_state.search_string = () => "ver";
-    search_query_box.trigger($.Event("blur", stub_event));
+    search_query_box.trigger(new $.Event("blur", stub_event));
     assert.equal(search_query_box.val(), "test string");
 
     searchbox.css({"box-shadow": "inset 0px 0px 0px 2px hsl(204, 20%, 74%)"});
diff --git a/frontend_tests/puppeteer_lib/common.js b/frontend_tests/puppeteer_lib/common.js
index ff8db1f020..091a8106a9 100644
--- a/frontend_tests/puppeteer_lib/common.js
+++ b/frontend_tests/puppeteer_lib/common.js
@@ -435,7 +435,7 @@ class CommonUtils {
                 $(field_selector)
                     .trigger("focus")
                     .val(str)
-                    .trigger($.Event("keyup", {which: 0}));
+                    .trigger(new $.Event("keyup", {which: 0}));
 
                 // Trigger the typeahead.
                 // Reaching into the guts of Bootstrap Typeahead like this is not
diff --git a/frontend_tests/puppeteer_tests/02-message-basics.js b/frontend_tests/puppeteer_tests/02-message-basics.js
index 1bae1300a2..c456aa7376 100644
--- a/frontend_tests/puppeteer_tests/02-message-basics.js
+++ b/frontend_tests/puppeteer_tests/02-message-basics.js
@@ -255,8 +255,8 @@ async function test_search_venice(page) {
             .expectOne()
             .trigger("focus")
             .val("vEnI") // Must be case insensitive.
-            .trigger($.Event("input"))
-            .trigger($.Event("click"));
+            .trigger("input")
+            .trigger("click");
     });
 
     await page.waitForSelector(await get_stream_li(page, "Denmark"), {hidden: true});
@@ -267,7 +267,7 @@ async function test_search_venice(page) {
 
     // Clearing list gives back all the streams in the list
     await page.evaluate(() =>
-        $(".stream-list-filter").expectOne().trigger("focus").val("").trigger($.Event("input")),
+        $(".stream-list-filter").expectOne().trigger("focus").val("").trigger("input"),
     );
     await page.waitForSelector(await get_stream_li(page, "Denmark"), {visible: true});
     await page.waitForSelector(await get_stream_li(page, "Venice"), {visible: true});
@@ -292,7 +292,7 @@ async function test_stream_search_filters_stream_list(page) {
 
     // Enter the search box and test highlighted suggestion
     await page.evaluate(() =>
-        $(".stream-list-filter").expectOne().trigger("focus").trigger($.Event("click")),
+        $(".stream-list-filter").expectOne().trigger("focus").trigger("click"),
     );
 
     await page.waitForSelector("#stream_filters .highlighted_stream", {visible: true});
@@ -327,7 +327,7 @@ async function test_stream_search_filters_stream_list(page) {
 
     // Search for brginning of "Verona".
     await page.evaluate(() =>
-        $(".stream-list-filter").expectOne().trigger("focus").val("ver").trigger($.Event("input")),
+        $(".stream-list-filter").expectOne().trigger("focus").val("ver").trigger("input"),
     );
     await page.waitForSelector(await get_stream_li(page, "Denmark"), {hidden: true});
     await page.click(await get_stream_li(page, "Verona"));
@@ -365,9 +365,7 @@ async function test_users_search(page) {
     await assert_in_list(page, "aaron");
 
     // Enter the search box and test selected suggestion navigation
-    await page.evaluate(() =>
-        $("#user_filter_icon").expectOne().trigger("focus").trigger($.Event("click")),
-    );
+    await page.evaluate(() => $("#user_filter_icon").expectOne().trigger("focus").trigger("click"));
     await page.waitForSelector("#user_presences .highlighted_user", {visible: true});
     await assert_selected(page, "Desdemona");
     await assert_not_selected(page, "Cordelia Lear");
diff --git a/frontend_tests/puppeteer_tests/08-admin.js b/frontend_tests/puppeteer_tests/08-admin.js
index 890dbe73fd..0a615cb9b4 100644
--- a/frontend_tests/puppeteer_tests/08-admin.js
+++ b/frontend_tests/puppeteer_tests/08-admin.js
@@ -239,7 +239,7 @@ async function get_suggestions(page, str) {
         $(".create_default_stream")
             .trigger("focus")
             .val(str)
-            .trigger($.Event("keyup", {which: 0}));
+            .trigger(new $.Event("keyup", {which: 0}));
     }, str);
 }
 
diff --git a/frontend_tests/puppeteer_tests/14-copy-and-paste.js b/frontend_tests/puppeteer_tests/14-copy-and-paste.js
index 28a222f7e1..1134c0be11 100644
--- a/frontend_tests/puppeteer_tests/14-copy-and-paste.js
+++ b/frontend_tests/puppeteer_tests/14-copy-and-paste.js
@@ -24,7 +24,7 @@ async function copy_messages(page, start_message, end_message) {
             $("#copytempdiv").remove();
 
             // emulate copy event
-            $("body").trigger($.Event("keydown", {which: 67, ctrlKey: true}));
+            $("body").trigger(new $.Event("keydown", {which: 67, ctrlKey: true}));
 
             // find temp div with copied text
             const temp_div = $("#copytempdiv");
diff --git a/frontend_tests/zjsunit/index.js b/frontend_tests/zjsunit/index.js
index 4b8e5b43ea..ab1022e3cd 100644
--- a/frontend_tests/zjsunit/index.js
+++ b/frontend_tests/zjsunit/index.js
@@ -97,7 +97,7 @@ try {
         }
 
         namespace.restore();
-        Handlebars.HandlebarsEnvironment();
+        Handlebars.HandlebarsEnvironment.call(Handlebars);
     });
 } catch (error) {
     if (error.stack) {
diff --git a/static/js/compose.js b/static/js/compose.js
index cd5035eebc..6568a681ed 100644
--- a/static/js/compose.js
+++ b/static/js/compose.js
@@ -425,7 +425,7 @@ exports.do_post_send_tasks = function () {
     exports.clear_preview_area();
     // TODO: Do we want to fire the event even if the send failed due
     // to a server-side error?
-    $(document).trigger($.Event("compose_finished.zulip"));
+    $(document).trigger("compose_finished.zulip");
 };
 
 exports.update_email = function (user_id, new_email) {
diff --git a/static/js/compose_actions.js b/static/js/compose_actions.js
index 6b3f129b12..4be6b914ca 100644
--- a/static/js/compose_actions.js
+++ b/static/js/compose_actions.js
@@ -119,7 +119,7 @@ exports.complete_starting_tasks = function (msg_type, opts) {
     ui_util.change_tab_to("#message_feed_container");
     compose_fade.start_compose(msg_type);
     ui_util.decorate_stream_bar(opts.stream, $("#stream-message .message_header_stream"), true);
-    $(document).trigger($.Event("compose_started.zulip", opts));
+    $(document).trigger(new $.Event("compose_started.zulip", opts));
     exports.update_placeholder_text();
 };
 
@@ -270,7 +270,7 @@ exports.cancel = function () {
     compose.abort_video_callbacks(undefined);
     compose_state.set_message_type(false);
     compose_pm_pill.clear();
-    $(document).trigger($.Event("compose_canceled.zulip"));
+    $(document).trigger("compose_canceled.zulip");
 };
 
 exports.respond_to_message = function (opts) {
diff --git a/static/js/dropdown_list_widget.js b/static/js/dropdown_list_widget.js
index ee93889c58..a8ce68a7d7 100644
--- a/static/js/dropdown_list_widget.js
+++ b/static/js/dropdown_list_widget.js
@@ -109,7 +109,7 @@ const DropdownListWidget = function (opts) {
                 return;
             }
             e.preventDefault();
-            const custom_event = jQuery.Event("keydown.dropdown.data-api", {
+            const custom_event = new jQuery.Event("keydown.dropdown.data-api", {
                 keyCode: e.keyCode,
                 which: e.keyCode,
             });
diff --git a/static/js/message_list.js b/static/js/message_list.js
index 60a75fc06e..b3b7d42afb 100644
--- a/static/js/message_list.js
+++ b/static/js/message_list.js
@@ -197,7 +197,7 @@ class MessageList {
             this.view.maybe_rerender();
         }
 
-        $(document).trigger($.Event("message_selected.zulip", opts));
+        $(document).trigger(new $.Event("message_selected.zulip", opts));
     }
 
     reselect_selected_id() {
diff --git a/static/js/server_events.js b/static/js/server_events.js
index 560600fe51..73b59a6435 100644
--- a/static/js/server_events.js
+++ b/static/js/server_events.js
@@ -299,7 +299,7 @@ exports.check_for_unsuspend = function () {
         watchdog_time = new_time;
         // Our app's JS wasn't running, which probably means the machine was
         // asleep.
-        $(document).trigger($.Event("unsuspend"));
+        $(document).trigger("unsuspend");
     }
     watchdog_time = new_time;
 };
diff --git a/static/js/upload.js b/static/js/upload.js
index ea38103152..c0a4ae5a45 100644
--- a/static/js/upload.js
+++ b/static/js/upload.js
@@ -172,7 +172,7 @@ exports.upload_files = function (uppy, config, files) {
 };
 
 exports.setup_upload = function (config) {
-    const uppy = Uppy({
+    const uppy = new Uppy({
         debug: false,
         autoProceed: true,
         restrictions: {
diff --git a/zerver/openapi/javascript_examples.js b/zerver/openapi/javascript_examples.js
index 7794cd9af3..00ab2dcf9b 100644
--- a/zerver/openapi/javascript_examples.js
+++ b/zerver/openapi/javascript_examples.js
@@ -13,7 +13,7 @@
   that the documented examples are all correct, runnable code.
 */
 
-const ExamplesHandler = function () {
+const examples_handler = function () {
     const config = {
         username: process.env.ZULIP_USERNAME,
         apiKey: process.env.ZULIP_API_KEY,
@@ -47,8 +47,8 @@ const ExamplesHandler = function () {
     };
 
     const main = async () => {
-        const Zulip = require("zulip-js");
-        const client = await Zulip(config);
+        const zulipInit = require("zulip-js");
+        const client = await zulipInit(config);
 
         await generate_validation_data(client, examples.send_message);
         await generate_validation_data(client, examples.create_user);
@@ -90,7 +90,7 @@ const ExamplesHandler = function () {
     };
 };
 
-const {main, add_example} = ExamplesHandler();
+const {main, add_example} = examples_handler();
 
 const send_test_message = async (client) => {
     const params = {
diff --git a/zerver/openapi/markdown_extension.py b/zerver/openapi/markdown_extension.py
index f9a60dcd36..864adeb64a 100644
--- a/zerver/openapi/markdown_extension.py
+++ b/zerver/openapi/markdown_extension.py
@@ -46,7 +46,7 @@ client = zulip.Client(config_file="~/zuliprc-admin")
 """
 
 JS_CLIENT_CONFIG = """
-const Zulip = require('zulip-js');
+const zulipInit = require('zulip-js');
 
 // Pass the path to your zuliprc file here.
 const config = { zuliprc: 'zuliprc' };
@@ -54,7 +54,7 @@ const config = { zuliprc: 'zuliprc' };
 """
 
 JS_CLIENT_ADMIN_CONFIG = """
-const Zulip = require('zulip-js');
+const zulipInit = require('zulip-js');
 
 // The user for this zuliprc file must be an organization administrator.
 const config = { zuliprc: 'zuliprc-admin' };
@@ -156,7 +156,7 @@ def render_javascript_code_example(function: str, admin_config: bool=False,
     code_example.append('```js')
     code_example.extend(config)
     for snippet in snippets:
-        code_example.append("Zulip(config).then(async (client) => {")
+        code_example.append("zulipInit(config).then(async (client) => {")
         for line in snippet:
             result = re.search('const result.*=(.*);', line)
             if result: