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

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

.eslintrc.json

@@ -272,7 +272,6 @@
                 "top_left_corner": false,
                 "topic_list": false,
                 "transmit": false,
-                "tutorial": false,
                 "typeahead_helper": false,
                 "typing": false,
                 "typing_data": false,

frontend_tests/node_tests/ui_init.js

@@ -105,7 +105,6 @@ zrequire("composebox_typeahead");
 zrequire("narrow");
 zrequire("search_suggestion");
 zrequire("search");
-zrequire("tutorial");
 rewiremock.proxy(() => zrequire("notifications"), {
     "../../static/js/favicon": {},
 });

static/js/bundles/app.js

@@ -119,7 +119,6 @@ import "../list_cursor";
 import "../activity";
 import "../user_events";
 import "../timerender";
-import "../tutorial";
 import "../hotspots";
 import "../templates";
 import "../upload_widget";

static/js/global.d.ts

@@ -138,7 +138,6 @@ declare let stream_topic_history: any;
 declare let topic_list: any;
 declare let top_left_corner: any;
 declare let transmit: any;
-declare let tutorial: any;
 declare let typeahead_helper: any;
 declare let typing: any;
 declare let typing_data: any;

static/js/tutorial.js

@@ -1,5 +1,3 @@
-"use strict";
-
 function set_tutorial_status(status, callback) {
     return channel.post({
         url: "/json/users/me/tutorial_status",
@@ -8,11 +6,9 @@ function set_tutorial_status(status, callback) {
     });
 }
 
-exports.initialize = function () {
+export function initialize() {
     if (page_params.needs_tutorial) {
         set_tutorial_status("started");
         narrow.by("is", "private", {trigger: "sidebar"});
     }
-};
-
-window.tutorial = exports;
+}

static/js/ui_init.js

@@ -17,6 +17,7 @@ const markdown_config = require("./markdown_config");
 const people = require("./people");
 const pm_conversations = require("./pm_conversations");
 const topic_zoom = require("./topic_zoom");
+const tutorial = require("./tutorial");
 const user_status = require("./user_status");
 const user_status_ui = require("./user_status_ui");