diff --git a/static/js/popovers.js b/static/js/popovers.js
index c9e31f7b15..c857a65551 100644
--- a/static/js/popovers.js
+++ b/static/js/popovers.js
@@ -589,8 +589,8 @@ exports.open_message_menu = function (message) {
         return true;
     }
 
-    const id = message.id;
-    exports.toggle_actions_popover($(".selected_message .actions_hover")[0], id);
+    const message_id = message.id;
+    exports.toggle_actions_popover($(".selected_message .actions_hover")[0], message_id);
     if (current_actions_popover_elem) {
         focus_first_action_popover_item();
     }
@@ -741,11 +741,11 @@ exports.register_click_handlers = function () {
     });
 
     $("#main_div").on("click", ".user-group-mention", function (e) {
-        const id = parseInt($(this).attr('data-user-group-id'), 10);
+        const user_group_id = parseInt($(this).attr('data-user-group-id'), 10);
         const row = $(this).closest(".message_row");
         e.stopPropagation();
         const message = current_msg_list.get(rows.id(row));
-        const group = user_groups.get_user_group_from_id(id, true);
+        const group = user_groups.get_user_group_from_id(user_group_id, true);
         if (group === undefined) {
             // This user group has likely been deleted.
             blueslip.info('Unable to find user group in message' + message.sender_id);
@@ -928,8 +928,8 @@ exports.register_click_handlers = function () {
     });
 
     function reminder_click_handler(datestr, e) {
-        const id = $(".remind.custom").data('message-id');
-        reminder.do_set_reminder_for_message(id, datestr);
+        const message_id = $(".remind.custom").data('message-id');
+        reminder.do_set_reminder_for_message(message_id, datestr);
         exports.hide_all();
         e.stopPropagation();
         e.preventDefault();
@@ -1051,8 +1051,8 @@ exports.register_click_handlers = function () {
 
     $('body').on('click', '.copy_link', function (e) {
         exports.hide_actions_popover();
-        const id = $(this).attr("data-message-id");
-        const row = $("[zid='" + id + "']");
+        const message_id = $(this).attr("data-message-id");
+        const row = $("[zid='" + message_id + "']");
         row.find(".alert-msg")
             .text(i18n.t("Copied!"))
             .css("display", "block")
diff --git a/static/js/stream_color.js b/static/js/stream_color.js
index 02ff73e9a5..540645744f 100644
--- a/static/js/stream_color.js
+++ b/static/js/stream_color.js
@@ -59,17 +59,17 @@ exports.set_colorpicker_color = function (colorpicker, color) {
 exports.update_stream_color = function (sub, color, opts) {
     opts = _.defaults({}, opts, {update_historical: false});
     sub.color = color;
-    const id = sub.stream_id;
+    const stream_id = sub.stream_id;
     // The swatch in the subscription row header.
-    $(".stream-row[data-stream-id='" + id + "'] .icon").css('background-color', color);
+    $(".stream-row[data-stream-id='" + stream_id + "'] .icon").css('background-color', color);
     // The swatch in the color picker.
-    exports.set_colorpicker_color($("#subscription_overlay .subscription_settings[data-stream-id='" + id + "'] .colorpicker"), color);
-    $("#subscription_overlay .subscription_settings[data-stream-id='" + id + "'] .large-icon").css("color", color);
+    exports.set_colorpicker_color($("#subscription_overlay .subscription_settings[data-stream-id='" + stream_id + "'] .colorpicker"), color);
+    $("#subscription_overlay .subscription_settings[data-stream-id='" + stream_id + "'] .large-icon").css("color", color);
 
     if (opts.update_historical) {
         update_historical_message_color(sub.name, color);
     }
-    update_stream_sidebar_swatch_color(id, color);
+    update_stream_sidebar_swatch_color(stream_id, color);
     if (!page_params.search_pills_enabled) {
         tab_bar.colorize_tab_bar();
     }
diff --git a/static/js/stream_edit.js b/static/js/stream_edit.js
index 46e014cd81..8ac0a03dfb 100644
--- a/static/js/stream_edit.js
+++ b/static/js/stream_edit.js
@@ -19,8 +19,7 @@ exports.setup_subscriptions_tab_hash = function (tab_key_value) {
 };
 
 exports.settings_for_sub = function (sub) {
-    const id = sub.stream_id;
-    return $("#subscription_overlay .subscription_settings[data-stream-id='" + id + "']");
+    return $("#subscription_overlay .subscription_settings[data-stream-id='" + sub.stream_id + "']");
 };
 
 exports.is_sub_settings_active = function (sub) {
@@ -96,8 +95,8 @@ function format_member_list_elem(email) {
 }
 
 function get_subscriber_list(sub_row) {
-    const id = sub_row.data("stream-id");
-    return $('.subscription_settings[data-stream-id="' + id + '"] .subscriber-list');
+    const stream_id_str = sub_row.data("stream-id");
+    return $('.subscription_settings[data-stream-id="' + stream_id_str + '"] .subscriber-list');
 }
 
 exports.update_stream_name = function (sub, new_name) {
diff --git a/static/js/subs.js b/static/js/subs.js
index a92bc50f87..157cc11558 100644
--- a/static/js/subs.js
+++ b/static/js/subs.js
@@ -15,8 +15,7 @@ exports.show_subs_pane = {
 };
 
 exports.check_button_for_sub = function (sub) {
-    const id = sub.stream_id;
-    return $(".stream-row[data-stream-id='" + id + "'] .check");
+    return $(".stream-row[data-stream-id='" + sub.stream_id + "'] .check");
 };
 
 exports.row_for_stream_id = function (stream_id) {
@@ -26,8 +25,7 @@ exports.row_for_stream_id = function (stream_id) {
 exports.settings_button_for_sub = function (sub) {
     // We don't do expectOne() here, because this button is only
     // visible if the user has that stream selected in the streams UI.
-    const id = sub.stream_id;
-    return $(".subscription_settings[data-stream-id='" + id + "'] .subscribe-button");
+    return $(".subscription_settings[data-stream-id='" + sub.stream_id + "'] .subscribe-button");
 };
 
 function get_row_data(row) {