js: Convert static/js/scroll_bar.js to ES6 module.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

.eslintrc.json

@@ -179,7 +179,6 @@
                 "realm_night_logo": false,
                 "recent_topics": false,
                 "reminder": false,
-                "scroll_bar": false,
                 "search": false,
                 "search_pill_widget": false,
                 "search_suggestion": false,

frontend_tests/node_tests/dispatch.js

@@ -46,7 +46,8 @@ const realm_icon = set_global("realm_icon", {});
 const realm_logo = set_global("realm_logo", {});
 const reload = {__esModule: true};
 rewiremock("../../static/js/reload").with(reload);
-const scroll_bar = set_global("scroll_bar", {});
+const scroll_bar = {__esModule: true};
+rewiremock("../../static/js/scroll_bar").with(scroll_bar);
 const settings_account = set_global("settings_account", {});
 const settings_bots = set_global("settings_bots", {});
 const settings_display = set_global("settings_display", {});

frontend_tests/node_tests/ui_init.js

@@ -86,7 +86,7 @@ rewiremock("../../static/js/message_viewport").with(message_viewport);
 set_global("panels", {initialize() {}});
 set_global("popovers", {initialize() {}});
 rewiremock("../../static/js/reload").with({initialize() {}});
-set_global("scroll_bar", {initialize() {}});
+rewiremock("../../static/js/scroll_bar").with({initialize() {}});
 const server_events = set_global("server_events", {initialize() {}});
 set_global("settings_sections", {initialize() {}});
 rewiremock("../../static/js/settings_panel_menu").with({initialize() {}});

static/js/bundles/app.js

@@ -27,7 +27,6 @@ import "../reload";
 import "../compose_actions";
 import "../subs";
 import "../ui";
-import "../scroll_bar";
 import "../gear_menu";
 import "../stream_popover";
 import "../popovers";

static/js/global.d.ts

@@ -52,7 +52,6 @@ declare let realm_icon: any;
 declare let realm_logo: any;
 declare let recent_topics: any;
 declare let reminder: any;
-declare let scroll_bar: any;
 declare let search: any;
 declare let search_pill_widget: any;
 declare let search_suggestion: any;

static/js/scroll_bar.js

@@ -1,6 +1,5 @@
-"use strict";
+import {media_breakpoints} from "./css_variables";
 
-const {media_breakpoints} = require("./css_variables");
 // A few of our width properties in Zulip depend on the width of the
 // browser scrollbar that is generated at the far right side of the
 // page, which unfortunately varies depending on the browser and
@@ -35,7 +34,7 @@ function getScrollbarWidth() {
 
 let sbWidth;
 
-exports.initialize = function () {
+export function initialize() {
     // Workaround for browsers with fixed scrollbars
     sbWidth = getScrollbarWidth();
 
@@ -71,10 +70,10 @@ exports.initialize = function () {
                 "</style>",
         );
     }
-    exports.set_layout_width();
+    set_layout_width();
-};
+}
 
-exports.set_layout_width = function () {
+export function set_layout_width() {
     // This logic unfortunately leads to a flash of mispositioned
     // content when reloading a Zulip browser window.  More details
     // are available in the comments on the max-width of 1400px in
@@ -90,6 +89,4 @@ exports.set_layout_width = function () {
         $(".fixed-app .app-main").css("max-width", 1400 + sbWidth + "px");
         $("#compose-container").css("max-width", 1400 + sbWidth + "px");
     }
-};
+}
-
-window.scroll_bar = exports;

static/js/server_events_dispatch.js

@@ -11,6 +11,7 @@ import * as night_mode from "./night_mode";
 import * as peer_data from "./peer_data";
 import * as people from "./people";
 import * as reload from "./reload";
+import * as scroll_bar from "./scroll_bar";
 import * as settings_config from "./settings_config";
 import * as stream_data from "./stream_data";
 import * as stream_events from "./stream_events";

static/js/ui_init.js

@@ -31,6 +31,7 @@ const pm_list = require("./pm_list");
 const reload = require("./reload");
 const resize = require("./resize");
 const rows = require("./rows");
+const scroll_bar = require("./scroll_bar");
 const sent_messages = require("./sent_messages");
 const settings_panel_menu = require("./settings_panel_menu");
 const settings_toggle = require("./settings_toggle");

static/js/zcommand.js

@@ -4,6 +4,7 @@ import * as channel from "./channel";
 import * as common from "./common";
 import * as feedback_widget from "./feedback_widget";
 import * as night_mode from "./night_mode";
+import * as scroll_bar from "./scroll_bar";
 
 /*