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

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

.eslintrc.json

@@ -134,7 +134,6 @@
                 "ListCursor": false,
                 "MessageListData": false,
                 "MessageListView": false,
-                "UserSearch": false,
                 "activity": false,
                 "admin": false,
                 "alert_words_ui": false,

frontend_tests/node_tests/activity.js

@@ -86,7 +86,6 @@ const presence = zrequire("presence");
 const people = zrequire("people");
 const buddy_data = zrequire("buddy_data");
 const buddy_list = zrequire("buddy_list");
-zrequire("user_search");
 const user_status = zrequire("user_status");
 zrequire("list_cursor");
 const activity = zrequire("activity");

static/js/activity.js

@@ -3,6 +3,7 @@
 const _ = require("lodash");
 
 const people = require("./people");
+const {UserSearch} = require("./user_search");
 
 /*
     Helpers for detecting user activity and managing user idle states

static/js/bundles/app.js

@@ -112,7 +112,6 @@ import "../message_fetch";
 import "../server_events";
 import "../zulip";
 import "../presence";
-import "../user_search";
 import "../user_status";
 import "../user_status_ui";
 import "../buddy_data";

static/js/global.d.ts

@@ -8,7 +8,6 @@ declare let Filter: any;
 declare let ListCursor: any;
 declare let MessageListData: any;
 declare let MessageListView: any;
-declare let UserSearch: any;
 declare let activity: any;
 declare let admin: any;
 declare let alert_words_ui: any;

static/js/user_search.js

@@ -1,6 +1,4 @@
-"use strict";
-
-class UserSearch {
+export class UserSearch {
     // This is mostly view code to manage the user search widget
     // above the buddy list.  We rely on other code to manage the
     // details of populating the list when we change.
@@ -119,6 +117,3 @@ class UserSearch {
         e.stopPropagation();
     }
 }
-
-module.exports = UserSearch;
-window.UserSearch = UserSearch;