[gnome-characters/bilelmoussaoui/gtk4: 30/76] misc: eslint fixes



commit 94b9235705c781a27220b358ebe67b19d002207d
Author: Bilal Elmoussaoui <bil elmoussaoui gmail com>
Date:   Sun Nov 21 16:57:28 2021 +0100

    misc: eslint fixes

 src/categoryList.js                           | 107 ++++++++-------
 src/characterDialog.js                        |  71 +++++-----
 src/charactersView.js                         | 161 +++++++++++------------
 src/main.js                                   |  57 ++++----
 src/menu.js                                   |  44 ++++---
 src/meson.build                               |   2 +-
 src/org.gnome.Characters.BackgroundService.in |   2 +-
 src/org.gnome.Characters.in                   |   2 +-
 src/searchProvider.js                         |  66 +++++-----
 src/service.js                                |  34 ++---
 src/util.js                                   |  37 +++---
 src/window.js                                 | 182 ++++++++++++--------------
 12 files changed, 387 insertions(+), 378 deletions(-)
---
diff --git a/src/categoryList.js b/src/categoryList.js
index 350b783..0c5412f 100644
--- a/src/categoryList.js
+++ b/src/categoryList.js
@@ -1,3 +1,4 @@
+/* exported CategoryListRowWidget Sidebar */
 // -*- Mode: js; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*-
 //
 // Copyright (C) 2014-2017  Daiki Ueno <dueno src gnome org>
@@ -17,10 +18,7 @@
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 
-const {Adw, Gc, GLib, GObject, Gtk, GnomeDesktop} = imports.gi;
-
-const Gettext = imports.gettext;
-
+const { Adw, Gc, GObject, Gtk, GnomeDesktop } = imports.gi;
 const Util = imports.util;
 
 const CategoryListRowWidget = GObject.registerClass({
@@ -46,22 +44,22 @@ const CategoryListRowWidget = GObject.registerClass({
         ),
     },
 }, class CategoryListRowWidget extends Gtk.ListBoxRow {
-    _init () {
+    _init() {
         super._init();
-        /*this.get_accessible().accessible_name =
+        /* this.get_accessible().accessible_name =
             _('%s Category List Row').format(category.title);*/
 
         let hbox = new Gtk.Box({ orientation: Gtk.Orientation.HORIZONTAL });
         this.set_child(hbox);
         let image = Gtk.Image.new();
-        this.bind_property("icon-name", image, "icon-name",
-        GObject.BindingFlags.DEFAULT | GObject.BindingFlags.SYNC_CREATE);
+        this.bind_property('icon-name', image, 'icon-name',
+            GObject.BindingFlags.DEFAULT | GObject.BindingFlags.SYNC_CREATE);
         image.set_icon_size(Gtk.IconSize.LARGE_TOOLBAR);
         image.add_css_class('category-icon');
         hbox.append(image);
 
         let label = new Gtk.Label({ halign: Gtk.Align.START });
-        this.bind_property("title", label, "label",GObject.BindingFlags.DEFAULT | 
GObject.BindingFlags.SYNC_CREATE);
+        this.bind_property('title', label, 'label', GObject.BindingFlags.DEFAULT | 
GObject.BindingFlags.SYNC_CREATE);
         label.add_css_class('category-label');
         hbox.append(label);
 
@@ -97,45 +95,41 @@ var Sidebar = GObject.registerClass({
         'lettersCurrencyRow', 'lettersMathRow', 'lettersLatinRow',
     ],
 }, class Sidebar extends Adw.Bin {
-    _init() {
-        super._init();
-    }
-
     rowByName(name) {
-        switch(name) {
-            case 'smileys':
-                return this._emojiSmileysRow;
-            case 'animals':
-                return this._emojiAnimalsRow;
-            case 'food':
-                return this._emojiFoodRow;
-            case 'activities':
-                return this._emojiActivitesRow;
-            case 'travel':
-                return this._emojiTravelRow;
-            case 'objects':
-                return this._emojiObjectsRow;
-            case 'symbols':
-                return this._emojiSymbolsRow;
-            case 'flags':
-                return this._emojiFlagsRow;
-            case 'punctuation':
-                return this._lettersPunctuationRow;
-            case 'arrows':
-                return this._lettersArrowsRow;
-            case 'bullets':
-                return this._lettersBulletsRow;
-            case 'pictures':
-                return this._lettersPicturesRow;
-            case 'currency':
-                return this._lettersCurrencyRow;
-            case 'math':
-                return this._lettersMathRow;
-            case 'latin':
-                return this._lettersLatinRow;
-            default:
-                return this._recentRow;
-       }
+        switch (name) {
+        case 'smileys':
+            return this._emojiSmileysRow;
+        case 'animals':
+            return this._emojiAnimalsRow;
+        case 'food':
+            return this._emojiFoodRow;
+        case 'activities':
+            return this._emojiActivitesRow;
+        case 'travel':
+            return this._emojiTravelRow;
+        case 'objects':
+            return this._emojiObjectsRow;
+        case 'symbols':
+            return this._emojiSymbolsRow;
+        case 'flags':
+            return this._emojiFlagsRow;
+        case 'punctuation':
+            return this._lettersPunctuationRow;
+        case 'arrows':
+            return this._lettersArrowsRow;
+        case 'bullets':
+            return this._lettersBulletsRow;
+        case 'pictures':
+            return this._lettersPicturesRow;
+        case 'currency':
+            return this._lettersCurrencyRow;
+        case 'math':
+            return this._lettersMathRow;
+        case 'latin':
+            return this._lettersLatinRow;
+        default:
+            return this._recentRow;
+        }
     }
 
     selectRowByName(name) {
@@ -154,7 +148,7 @@ var Sidebar = GObject.registerClass({
                 for (let j in engines) {
                     let engine = engines[j];
                     let language = engine.get_language();
-                    if (language != null)
+                    if (language !== null)
                         this._ibusLanguageList[engine.get_name()] = language;
                 }
             }
@@ -165,7 +159,7 @@ var Sidebar = GObject.registerClass({
     }
 
     _ensureIBusLanguageList(sources) {
-        if (this._ibusLanguageList != null)
+        if (this._ibusLanguageList !== null)
             return;
 
         this._ibusLanguageList = {};
@@ -182,9 +176,12 @@ var Sidebar = GObject.registerClass({
         ibus.init();
         let bus = new ibus.Bus();
         if (bus.is_connected()) {
-            bus.list_engines_async(-1, null, (sources, bus, res) => this._finishListEngines(sources, bus, 
res));
-        } else
+            bus.list_engines_async(-1, null, (sources_, bus_, res) => {
+                this._finishListEngines(sources_, bus_, res);
+            });
+        } else {
             this._finishBuildScriptList(sources);
+        }
     }
 
     _finishBuildScriptList(sources) {
@@ -214,7 +211,7 @@ var Sidebar = GObject.registerClass({
         let allScripts = [];
         for (let i in languages) {
             let language = GnomeDesktop.normalize_locale(languages[i]);
-            if (language == null)
+            if (language === null)
                 continue;
             let scripts = Gc.get_scripts_for_language(languages[i]);
             for (let j in scripts) {
@@ -252,11 +249,11 @@ var Sidebar = GObject.registerClass({
         //
         let settings =
             Util.getSettings('org.gnome.desktop.input-sources',
-                             '/org/gnome/desktop/input-sources/');
+                '/org/gnome/desktop/input-sources/');
         if (settings) {
             let sources = settings.get_value('sources').deep_unpack();
-            let hasIBus = sources.some(function(current, index, array) {
-                return current[0] == 'ibus';
+            let hasIBus = sources.some((current, _index, _array) => {
+                return current[0] === 'ibus';
             });
             if (hasIBus)
                 this._ensureIBusLanguageList(sources);
diff --git a/src/characterDialog.js b/src/characterDialog.js
index d362d59..ff46f49 100644
--- a/src/characterDialog.js
+++ b/src/characterDialog.js
@@ -1,3 +1,4 @@
+/* exported CharacterDialog */
 // -*- Mode: js; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*-
 //
 // Copyright (C) 2014-2015  Daiki Ueno <dueno src gnome org>
@@ -16,26 +17,26 @@
 // along with this program; if not, write to the Free Software
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-const {Gc, GLib, Gio,GObject,Gtk, Pango} = imports.gi;
+const { Gc, GLib, Gio, GObject, Gtk, Pango } = imports.gi;
 
 const Util = imports.util;
 
 var CharacterDialog = GObject.registerClass({
 
     Signals: {
-        'character-copied': { param_types: [ GObject.TYPE_STRING ] }
+        'character-copied': { param_types: [GObject.TYPE_STRING] },
     },
     Template: 'resource:///org/gnome/Characters/character.ui',
     InternalChildren: ['main-stack', 'character-stack',
-                       'character-label', 'missing-label', 'detail-label',
-                       'copy-button', 'copy-revealer', 'related-listbox'],
+        'character-label', 'missing-label', 'detail-label',
+        'copy-button', 'copy-revealer', 'related-listbox'],
 }, class CharacterDialog extends Gtk.Dialog {
     _init(character, fontDescription) {
         super._init({
             use_header_bar: true,
             width_request: 400,
-            height_request: 400
-       });
+            height_request: 400,
+        });
 
         this._cancellable = new Gio.Cancellable();
 
@@ -43,16 +44,16 @@ var CharacterDialog = GObject.registerClass({
 
         this._related_listbox.connect('row-selected', (listBox, row) => this._handleRowSelected(listBox, 
row));
 
-        this._relatedButton = new Gtk.ToggleButton({ label: _("See Also") });
+        this._relatedButton = new Gtk.ToggleButton({ label: _('See Also') });
         this.add_action_widget(this._relatedButton, Gtk.ResponseType.HELP);
         this._relatedButton.show();
 
         this._relatedButton.connect('toggled', () => {
-                if (this._main_stack.visible_child_name == 'character')
-                    this._main_stack.visible_child_name = 'related';
-                else
-                    this._main_stack.visible_child_name = 'character';
-            });
+            if (this._main_stack.visible_child_name === 'character')
+                this._main_stack.visible_child_name = 'related';
+            else
+                this._main_stack.visible_child_name = 'character';
+        });
 
         this._fontDescription = fontDescription;
         this._setCharacter(character);
@@ -68,21 +69,21 @@ var CharacterDialog = GObject.registerClass({
         for (let index = 0; index < result.len; index++) {
             let uc = Gc.search_result_get(result, index);
             let name = Gc.character_name(uc);
-            if (name == null)
+            if (name === null)
                 continue;
 
             let hbox = new Gtk.Box({ orientation: Gtk.Orientation.HORIZONTAL });
 
             let characterLabel = new Gtk.Label({ label: uc,
-                                                 valign: Gtk.Align.CENTER,
-                                                 halign: Gtk.Align.CENTER,
-                                                 width_request: 45 });
+                valign: Gtk.Align.CENTER,
+                halign: Gtk.Align.CENTER,
+                width_request: 45 });
             characterLabel.add_css_class('character');
             hbox.pack_start(characterLabel, false, false, 2);
 
             let nameLabel = new Gtk.Label({ label: Util.capitalize(name),
-                                            halign: Gtk.Align.START,
-                                            ellipsize: Pango.EllipsizeMode.END });
+                halign: Gtk.Align.START,
+                ellipsize: Pango.EllipsizeMode.END });
             hbox.pack_start(nameLabel, true, true, 0);
 
             let row = new Gtk.ListBoxRow();
@@ -104,11 +105,11 @@ var CharacterDialog = GObject.registerClass({
         let codePointHex = codePoint.toString(16).toUpperCase();
 
         let name = Gc.character_name(this._character);
-        if (name != null) {
+        if (name !== null)
             name = Util.capitalize(name);
-        } else {
-            name = _("Unicode U+%04s").format(codePointHex);
-        }
+        else
+            name = _('Unicode U+%04s').format(codePointHex);
+
 
         let headerBar = this.get_header_bar();
         headerBar.title = name;
@@ -119,28 +120,28 @@ var CharacterDialog = GObject.registerClass({
         var pangoContext = this._character_label.get_pango_context();
         var pangoLayout = Pango.Layout.new(pangoContext);
         pangoLayout.set_text(this._character, -1);
-        if (pangoLayout.get_unknown_glyphs_count() == 0) {
+        if (pangoLayout.get_unknown_glyphs_count() === 0) {
             this._character_stack.visible_child_name = 'character';
         } else {
             var fontFamily = this._fontDescription.get_family();
             this._missing_label.label =
                 // TRANSLATORS: the first variable is a character, the second is a font
-                _("%s is not included in %s").format(name, fontFamily);
+                _('%s is not included in %s').format(name, fontFamily);
             this._character_stack.visible_child_name = 'missing';
         }
 
-        this._detail_label.label = _("Unicode U+%04s").format(codePointHex);
+        this._detail_label.label = _('Unicode U+%04s').format(codePointHex);
 
         this._cancellable.cancel();
         this._cancellable.reset();
         let criteria = Gc.SearchCriteria.new_related(this._character);
-        let context = new Gc.SearchContext({ criteria: criteria });
+        let context = new Gc.SearchContext({ criteria });
         context.search(
             -1,
             this._cancellable,
-            (context, res) => {
+            (ctx, res) => {
                 try {
-                    let result = context.search_finish(res);
+                    let result = ctx.search_finish(res);
                     this._finishSearch(result);
                 } catch (e) {
                     log(`Failed to search related: ${e.message}`);
@@ -162,15 +163,15 @@ var CharacterDialog = GObject.registerClass({
 
     _clipboardOwnerChanged(clipboard) {
         let text = clipboard.wait_for_text();
-        if (text != this._character)
+        if (text !== this._character)
             this._hideCopyRevealer();
     }
 
     _copyCharacter() {
-        if (this._clipboard == null) {
+        if (this._clipboard === null) {
             this._clipboard = Gc.gtk_clipboard_get();
             let clipboardOwnerChanged =
-                this._clipboard.connect('owner-change', (clipboard) => 
this._clipboardOwnerChanged(clipboard));
+                this._clipboard.connect('owner-change', clipboard => this._clipboardOwnerChanged(clipboard));
             this.connect('destroy', () => this._clipboard.disconnect(clipboardOwnerChanged));
         }
         this._clipboard.set_text(this._character, -1);
@@ -184,13 +185,13 @@ var CharacterDialog = GObject.registerClass({
         this._copyRevealerTimeoutId =
             GLib.timeout_add(GLib.PRIORITY_DEFAULT, 2000, () => this._hideCopyRevealer());
         this.connect('destroy', () => {
-                         if (this._copyRevealerTimeoutId > 0)
-                             GLib.source_remove(this._copyRevealerTimeoutId);
-                     });
+            if (this._copyRevealerTimeoutId > 0)
+                GLib.source_remove(this._copyRevealerTimeoutId);
+        });
     }
 
     _handleRowSelected(listBox, row) {
-        if (row != null) {
+        if (row !== null) {
             this._setCharacter(row._character);
             let toplevel = this.get_transient_for();
             let action = toplevel.lookup_action('character');
diff --git a/src/charactersView.js b/src/charactersView.js
index 929c606..e562d5d 100644
--- a/src/charactersView.js
+++ b/src/charactersView.js
@@ -1,3 +1,4 @@
+/* exported CharactersView FontFilter RecentCharacterListView */
 // -*- Mode: js; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*-
 //
 // Copyright (C) 2014-2015  Daiki Ueno <dueno src gnome org>
@@ -16,9 +17,7 @@
 // along with this program; if not, write to the Free Software
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-const {Adw, Gc, Gdk, GLib, Gio,GObject,Gtk, Pango, Graphene, PangoCairo} = imports.gi;
-
-const Cairo = imports.cairo;
+const { Adw, Gc, Gdk, GLib, Gio, GObject, Gtk, Pango, Graphene, PangoCairo } = imports.gi;
 
 const Main = imports.main;
 const Util = imports.util;
@@ -30,7 +29,7 @@ const NUM_COLUMNS = 3;
 const CELL_SIZE = 50;
 
 function getCellSize(fontDescription) {
-    if (fontDescription == null || fontDescription.get_size() == 0)
+    if (fontDescription === null || fontDescription.get_size() === 0)
         return CELL_SIZE;
     return fontDescription.get_size() * 2 / Pango.SCALE;
 }
@@ -53,33 +52,33 @@ const CharacterListRow = GObject.registerClass({
         this._styleContext = styleContext;
         // Draw baseline.
         // FIXME: Pick the baseline color from CSS.
-        let accent_color = this._styleContext.lookup_color('accent_color')[1];
-        Gdk.cairo_set_source_rgba(cr, accent_color);
+        let accentColor = this._styleContext.lookup_color('accent_color')[1];
+        Gdk.cairo_set_source_rgba(cr, accentColor);
         cr.setLineWidth(0.5);
         cr.moveTo(x, y + BASELINE_OFFSET * height);
         cr.relLineTo(width, 0);
         cr.stroke();
-        let fg_color = this._styleContext.get_color();
-        Gdk.cairo_set_source_rgba(cr, fg_color);
+        let fgColor = this._styleContext.get_color();
+        Gdk.cairo_set_source_rgba(cr, fgColor);
 
         // Draw characters.  Do centering and attach to the baseline.
         let cellSize = getCellSize(this._fontDescription);
         for (let i in this._characters) {
             var cellRect = new Gdk.Rectangle({ x: x + cellSize * i,
-                                               y: y,
-                                               width: cellSize,
-                                               height: cellSize });
+                y,
+                width: cellSize,
+                height: cellSize });
             if (Gc.character_is_invisible(this._characters[i])) {
                 this._drawBoundingBox(cr, cellRect, this._characters[i]);
                 this._drawCharacterName(cr, cellRect, this._characters[i]);
             } else {
                 layout.set_text(this._characters[i], -1);
-                if (layout.get_unknown_glyphs_count () == 0) {
+                if (layout.get_unknown_glyphs_count() === 0) {
                     let layoutBaseline = layout.get_baseline();
-                    let [logicalRect, inkRect] = layout.get_extents();
+                    let logicalRect = layout.get_extents()[0];
                     cr.moveTo(x + cellSize * i - logicalRect.x / Pango.SCALE +
                               (cellSize - logicalRect.width / Pango.SCALE) / 2,
-                              y + BASELINE_OFFSET * height -
+                    y + BASELINE_OFFSET * height -
                               layoutBaseline / Pango.SCALE);
                     PangoCairo.show_layout(cr, layout);
                 } else {
@@ -97,17 +96,17 @@ const CharacterListRow = GObject.registerClass({
 
         let shapeRect;
         let layoutBaseline;
-        if (layout.get_unknown_glyphs_count() == 0) {
-            let [logicalRect, inkRect] = layout.get_extents();
+        if (layout.get_unknown_glyphs_count() === 0) {
+            let inkRect = layout.get_extents()[1];
             layoutBaseline = layout.get_baseline();
             shapeRect = inkRect;
         } else {
             // If the character cannot be rendered with the current
             // font settings, show a rectangle calculated from the
             // base glyphs ('AA').
-            if (this._baseGlyphRect == null) {
+            if (this._baseGlyphRect === null) {
                 layout.set_text('AA', -1);
-                let [baseLogicalRect, baseInkRect] = layout.get_extents();
+                let baseInkRect = layout.get_extents()[1];
                 this._baseGlyphLayoutBaseline = layout.get_baseline();
                 this._baseGlyphRect = baseInkRect;
             }
@@ -116,9 +115,9 @@ const CharacterListRow = GObject.registerClass({
                 x: this._baseGlyphRect.x,
                 y: this._baseGlyphRect.y,
                 width: this._baseGlyphRect.width,
-                height: this._baseGlyphRect.height
+                height: this._baseGlyphRect.height,
             });
-            let characterWidth = Gc.character_width (uc);
+            let characterWidth = Gc.character_width(uc);
             if (characterWidth > 1)
                 shapeRect.width *= characterWidth;
         }
@@ -127,8 +126,8 @@ const CharacterListRow = GObject.registerClass({
             (cellRect.width - shapeRect.width / Pango.SCALE) / 2;
         shapeRect.y = cellRect.y + BASELINE_OFFSET * cellRect.height -
             layoutBaseline / Pango.SCALE;
-        shapeRect.width = shapeRect.width / Pango.SCALE;
-        shapeRect.height = shapeRect.height / Pango.SCALE;
+        shapeRect.width /= Pango.SCALE;
+        shapeRect.height /= Pango.SCALE;
         return shapeRect;
     }
 
@@ -144,9 +143,9 @@ const CharacterListRow = GObject.registerClass({
 
         let borderWidth = 1;
         cr.rectangle(shapeRect.x - borderWidth * 2,
-                     shapeRect.y - borderWidth * 2,
-                     shapeRect.width + borderWidth * 2,
-                     shapeRect.height + borderWidth * 2);
+            shapeRect.y - borderWidth * 2,
+            shapeRect.width + borderWidth * 2,
+            shapeRect.height + borderWidth * 2);
         cr.setSourceRGBA(239.0 / 255.0, 239.0 / 255.0, 239.0 / 255.0, 1.0);
         cr.fill();
 
@@ -166,20 +165,20 @@ const CharacterListRow = GObject.registerClass({
         layout.set_alignment(Pango.Alignment.CENTER);
         layout.set_font_description(this._overlayFontDescription);
         let name = Gc.character_name(uc);
-        let text = name == null ? _('Unassigned') : Util.capitalize(name);
+        let text = name === null ? _('Unassigned') : Util.capitalize(name);
         layout.set_text(text, -1);
-        let [logicalRect, inkRect] = layout.get_extents();
+        let logicalRect = layout.get_extents()[0];
         cr.moveTo(cellRect.x - logicalRect.x / Pango.SCALE +
                   (cellRect.width - logicalRect.width / Pango.SCALE) / 2,
-                  cellRect.y - logicalRect.y / Pango.SCALE +
+        cellRect.y - logicalRect.y / Pango.SCALE +
                   (cellRect.height - logicalRect.height / Pango.SCALE) / 2);
-        let text_color;
-        if (!this._styleManager.dark) {
-            text_color = this._styleContext.get_color(Gtk.StateFlags.NORMAL);
-        } else {
-            text_color = this._styleContext.get_background_color(Gtk.StateFlags.NORMAL);
-        }
-        cr.setSourceRGBA(text_color.red, text_color.green, text_color.blue, text_color.alpha);
+        let textColor;
+        if (!this._styleManager.dark)
+            textColor = this._styleContext.get_color(Gtk.StateFlags.NORMAL);
+        else
+            textColor = this._styleContext.get_background_color(Gtk.StateFlags.NORMAL);
+
+        Gdk.cairo_set_source_rgba(cr, textColor);
         PangoCairo.show_layout(cr, layout);
 
         cr.restore();
@@ -188,7 +187,7 @@ const CharacterListRow = GObject.registerClass({
 
 const CharacterListWidget = GObject.registerClass({
     Signals: {
-        'character-selected': { param_types: [ GObject.TYPE_STRING ] }
+        'character-selected': { param_types: [GObject.TYPE_STRING] },
     },
 }, class CharacterListWidget extends Gtk.Widget {
     _init(numRows) {
@@ -201,7 +200,7 @@ const CharacterListWidget = GObject.registerClass({
         this._numRows = numRows;
         this._characters = [];
         this._rows = [];
-        /*this.add_events(Gdk.EventMask.BUTTON_PRESS_MASK |
+        /* this.add_events(Gdk.EventMask.BUTTON_PRESS_MASK |
                         Gdk.EventMask.BUTTON_RELEASE_MASK);
         this.drag_source_set(Gdk.ModifierType.BUTTON1_MASK,
                              null,
@@ -226,7 +225,7 @@ const CharacterListWidget = GObject.registerClass({
     }
 
     vfunc_drag_data_get(context, data, info, time) {
-        if (this._character != null)
+        if (this._character !== null)
             data.set_text(this._character, -1);
     }
 
@@ -250,8 +249,8 @@ const CharacterListWidget = GObject.registerClass({
     }
     */
 
-    vfunc_measure(orientation, for_size) {
-        if(orientation === Gtk.Orientation.HORIZONTAL) {
+    vfunc_measure(orientation, _forSize) {
+        if (orientation === Gtk.Orientation.HORIZONTAL) {
             let cellSize = getCellSize(this._fontDescription);
             let minWidth = NUM_COLUMNS * cellSize;
             let natWidth = Math.max(this._cellsPerRow, NUM_COLUMNS) * cellSize;
@@ -259,7 +258,7 @@ const CharacterListWidget = GObject.registerClass({
         } else {
             let height = Math.max(this._rows.length, this._numRows) *
                 getCellSize(this._fontDescription);
-            return [height, height, -1 , -1];
+            return [height, height, -1, -1];
         }
     }
 
@@ -267,8 +266,8 @@ const CharacterListWidget = GObject.registerClass({
         // Clear the canvas.
         let allocation = this.get_allocation();
         let rect = new Graphene.Rect({
-            origin: new Graphene.Point({x: 0, y:0}),
-            size: new Graphene.Size({width: allocation.width, height: allocation.height})
+            origin: new Graphene.Point({ x: 0, y: 0 }),
+            size: new Graphene.Size({ width: allocation.width, height: allocation.height }),
         });
         let cr = snapshot.append_cairo(rect);
 
@@ -281,13 +280,13 @@ const CharacterListWidget = GObject.registerClass({
         // https://bugzilla.gnome.org/show_bug.cgi?id=700592
 
         // Redraw rows within the clipped region.
-        let [x1, y1, x2, y2] = cr.clipExtents();
+        let [_, y1, __, y2] = cr.clipExtents();
         let cellSize = getCellSize(this._fontDescription);
         let start = Math.max(0, Math.floor(y1 / cellSize));
         let end = Math.min(this._rows.length, Math.ceil(y2 / cellSize));
         for (let index = start; index < end; index++) {
             this._rows[index].draw(cr, 0, index * cellSize,
-                                   allocation.width, cellSize, context);
+                allocation.width, cellSize, context);
         }
     }
 
@@ -300,7 +299,7 @@ const CharacterListWidget = GObject.registerClass({
 
         let cellSize = getCellSize(this._fontDescription);
         let cellsPerRow = Math.floor(width / cellSize);
-        if (cellsPerRow != this._cellsPerRow) {
+        if (cellsPerRow !== this._cellsPerRow) {
             // Reflow if the number of cells per row has changed.
             this._cellsPerRow = cellsPerRow;
             this.setCharacters(this._characters);
@@ -326,14 +325,14 @@ const CharacterListWidget = GObject.registerClass({
 
         let start = 0, stop = 1;
         for (; stop <= characters.length; stop++) {
-            if (stop % this._cellsPerRow == 0) {
+            if (stop % this._cellsPerRow === 0) {
                 let rowCharacters = characters.slice(start, stop);
                 let row = this._createCharacterListRow(rowCharacters);
                 this._rows.push(row);
                 start = stop;
             }
         }
-        if (start != stop - 1) {
+        if (start !== stop - 1) {
             let rowCharacters = characters.slice(start, stop);
             let row = this._createCharacterListRow(rowCharacters);
             this._rows.push(row);
@@ -351,10 +350,10 @@ var FontFilter = GObject.registerClass({
         'font': GObject.ParamSpec.string(
             'font', '', '',
             GObject.ParamFlags.READABLE | GObject.ParamFlags.WRITABLE,
-            'Cantarell 50')
+            'Cantarell 50'),
     },
     Signals: {
-        'filter-set': { param_types: [] }
+        'filter-set': { param_types: [] },
     },
 }, class FontFilter extends GObject.Object {
     _init() {
@@ -372,7 +371,7 @@ var FontFilter = GObject.registerClass({
 
     set font(v) {
         let fontDescription = Pango.FontDescription.from_string(v);
-        if (fontDescription.get_size() == 0)
+        if (fontDescription.get_size() === 0)
             fontDescription.set_size(CELL_SIZE * Pango.SCALE);
 
         if (this._fontDescription &&
@@ -391,23 +390,23 @@ var FontFilter = GObject.registerClass({
 
     setFilterFont(v) {
         let fontDescription;
-        if (v == null) {
+        if (v === null) {
             fontDescription = null;
         } else {
             fontDescription = Pango.FontDescription.from_string(v);
             fontDescription.set_size(this._fontDescription.get_size());
         }
 
-        if ((this._filterFontDescription != null && fontDescription == null) ||
-            (this._filterFontDescription == null && fontDescription != null) ||
-            (this._filterFontDescription != null && fontDescription != null &&
-             !fontDescription.equal(this._filterFontDescription))) {
+        if (this._filterFontDescription !== null && fontDescription === null ||
+            this._filterFontDescription === null && fontDescription !== null ||
+            this._filterFontDescription !== null && fontDescription !== null &&
+             !fontDescription.equal(this._filterFontDescription)) {
             this._filterFontDescription = fontDescription;
             this.emit('filter-set');
         }
     }
 
-    apply(widget, characters) {
+    filter(widget, characters) {
         let fontDescription = this._fontDescription;
         if (this._filterFontDescription) {
             let context = widget.get_pango_context();
@@ -429,7 +428,7 @@ var FontFilter = GObject.registerClass({
 var CharactersView = GObject.registerClass({
     Template: 'resource:///org/gnome/Characters/characters_view.ui',
     Signals: {
-        'character-selected': { param_types: [ GObject.TYPE_STRING ] }
+        'character-selected': { param_types: [GObject.TYPE_STRING] },
     },
     Properties: {
         'model': GObject.ParamSpec.object(
@@ -438,7 +437,7 @@ var CharactersView = GObject.registerClass({
             GObject.ParamFlags.READWRITE,
             Gio.ListModel.$gtype,
         ),
-    }
+    },
 }, class CharactersView extends Adw.Bin {
     _init() {
         super._init();
@@ -474,16 +473,16 @@ var CharactersView = GObject.registerClass({
         this._stopSpinner();
         this._spinnerTimeoutId =
             GLib.timeout_add(GLib.PRIORITY_DEFAULT, 1000, () => {
-                                 //this._loading_spinner.start();
-                                 //this.visible_child_name = 'loading';
-                             });
+                // this._loading_spinner.start();
+                // this.visible_child_name = 'loading';
+            });
     }
 
     _stopSpinner() {
         if (this._spinnerTimeoutId > 0) {
             GLib.source_remove(this._spinnerTimeoutId);
             this._spinnerTimeoutId = 0;
-            //this._loading_spinner.stop();
+            // this._loading_spinner.stop();
         }
     }
 
@@ -502,7 +501,7 @@ var CharactersView = GObject.registerClass({
 
     _updateCharacterList() {
         log('Updating characters list');
-        const [fontDescription, characters] = this._fontFilter.apply(this, this._characters);
+        const [fontDescription, characters] = this._fontFilter.filter(this, this._characters);
         log(JSON.stringify(characters));
         this._characterList.setFontDescription(fontDescription);
         this._characterList.setCharacters(characters);
@@ -531,41 +530,41 @@ var CharactersView = GObject.registerClass({
 
     _searchWithContext(context, count) {
         this._startSpinner();
-        context.search(count, this._cancellable, (context, res, user_data) => {
-                this._stopSpinner();
-                try {
-                    let result = context.search_finish(res);
-                    this._addSearchResult(result);
-                } catch (e) {
-                    log(`Failed to search: ${e.message}`);
-                }
-            });
+        context.search(count, this._cancellable, (ctx, res) => {
+            this._stopSpinner();
+            try {
+                let result = ctx.search_finish(res);
+                this._addSearchResult(result);
+            } catch (e) {
+                log(`Failed to search: ${e.message}`);
+            }
+        });
     }
 
     searchByCategory(category) {
         this._characters = [];
-        /*if ('scripts' in category) {
+        /* if ('scripts' in category) {
             this.searchByScripts(category.scripts);
             return;
         }*/
 
         let criteria = Gc.SearchCriteria.new_category(category);
-        this._searchContext = new Gc.SearchContext({ criteria: criteria });
+        this._searchContext = new Gc.SearchContext({ criteria });
         this._searchWithContext(this._searchContext, this.initialSearchCount);
     }
 
     searchByKeywords(keywords) {
         const criteria = Gc.SearchCriteria.new_keywords(keywords);
         this._searchContext = new Gc.SearchContext({
-            criteria: criteria,
-            flags: Gc.SearchFlag.WORD
+            criteria,
+            flags: Gc.SearchFlag.WORD,
         });
         this._searchWithContext(this._searchContext, this.initialSearchCount);
     }
 
     searchByScripts(scripts) {
         var criteria = Gc.SearchCriteria.new_scripts(scripts);
-        this._searchContext = new Gc.SearchContext({ criteria: criteria });
+        this._searchContext = new Gc.SearchContext({ criteria });
         this._searchWithContext(this._searchContext, this.initialSearchCount);
     }
 
@@ -577,12 +576,12 @@ var CharactersView = GObject.registerClass({
 
 var RecentCharacterListView = GObject.registerClass({
     Signals: {
-        'character-selected': { param_types: [ GObject.TYPE_STRING ] },
+        'character-selected': { param_types: [GObject.TYPE_STRING] },
     },
 }, class RecentCharacterListView extends Adw.Bin {
     _init(category) {
         super._init({
-            hexpand: true, vexpand: false
+            hexpand: true, vexpand: false,
         });
 
         this._characterList = new CharacterListWidget(0);
@@ -606,7 +605,7 @@ var RecentCharacterListView = GObject.registerClass({
     }
 
     _updateCharacterList() {
-        const [fontDescription, characters] = this._fontFilter.apply(this, this._characters);
+        const [fontDescription, characters] = this._fontFilter.filter(this, this._characters);
         this._characterList.setFontDescription(fontDescription);
         this._characterList.setCharacters(characters);
     }
diff --git a/src/main.js b/src/main.js
index c3bd600..d429079 100644
--- a/src/main.js
+++ b/src/main.js
@@ -1,3 +1,4 @@
+/* exported main settings */
 // -*- Mode: js; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*-
 //
 // Copyright (c) 2013 Giovanni Campagna <scampa giovanni gmail com>
@@ -26,7 +27,7 @@
 
 pkg.initGettext();
 pkg.initFormat();
-pkg.require({ 
+pkg.require({
     'Gdk': '4.0',
     'Gio': '2.0',
     'GLib': '2.0',
@@ -36,73 +37,83 @@ pkg.require({
     'GnomeDesktop': '4.0',
 });
 
-const {Gc, GLib, Gio, GObject, Gtk, Adw} = imports.gi;
+const { GLib, Gio, GObject, Adw } = imports.gi;
 
-const Util = imports.util;
+const { CharactersView } = imports.charactersView;
+const { Sidebar } = imports.categoryList;
+const { MenuPopover } = imports.menu;
 const { MainWindow } = imports.window;
 
+const Util = imports.util;
+
 var settings = null;
-var application_id = pkg.name;
+var applicationId = pkg.name;
 
 var MyApplication = GObject.registerClass({
-},class MyApplication extends Adw.Application {
-    _init () {
+}, class MyApplication extends Adw.Application {
+    _init() {
         super._init({
-            application_id: application_id,
+            application_id: applicationId,
             flags: Gio.ApplicationFlags.FLAGS_NONE,
             resource_base_path: '/org/gnome/Characters',
         });
         GLib.set_application_name(_('Characters'));
     }
 
-    _onQuit () {
+    _onQuit() {
         this.quit();
     }
 
-    _onSearch (action, parameter) {
+    _onSearch(action, parameter) {
         const window = new MainWindow(this);
         window.setSearchKeywords(parameter.get_strv());
         window.show();
     }
 
-    vfunc_startup () {
+    vfunc_startup() {
         super.vfunc_startup();
 
         this.get_style_manager().set_color_scheme(Adw.ColorScheme.PREFER_LIGHT);
 
-        Util.initActions(this,
-                         [{ name: 'quit',
-                            activate: this._onQuit },
-                          { name: 'search',
-                            activate: this._onSearch,
-                            parameter_type: new GLib.VariantType('as') }]);
+        Util.initActions(this, [
+            { name: 'quit', activate: this._onQuit },
+            {
+                name: 'search',
+                activate: this._onSearch,
+                parameterType: new GLib.VariantType('as'),
+            },
+        ]);
         this.set_accels_for_action('app.quit', ['<Primary>q']);
         this.set_accels_for_action('win.find', ['<Primary>f']);
         this.set_accels_for_action('win.show-primary-menu', ['F10']);
         this.set_accels_for_action('win.show-help-overlay', ['<Primary>question']);
 
         settings = Util.getSettings('org.gnome.Characters',
-                                    '/org/gnome/Characters/');
+            '/org/gnome/Characters/');
 
-        log("Characters Application started");
+        log('Characters Application started');
     }
 
     vfunc_activate() {
-        if (!this._appwindow) {
+        if (!this._appwindow)
             this._appwindow = new MainWindow(this);
-        }
+
 
         this._appwindow.present();
-        log("Characters Application activated");
+        log('Characters Application activated');
     }
 
     vfunc_shutdown() {
-        log("Characters Application exiting");
+        log('Characters Application exiting');
 
         super.vfunc_shutdown();
     }
 });
 
 function main(argv) {
-    return (new MyApplication()).run(argv);
+    GObject.type_ensure(CharactersView.$gtype);
+    GObject.type_ensure(Sidebar.$gtype);
+    GObject.type_ensure(MenuPopover.$gtype);
+
+    return new MyApplication().run(argv);
 }
diff --git a/src/menu.js b/src/menu.js
index 1b7f64d..5843e19 100644
--- a/src/menu.js
+++ b/src/menu.js
@@ -1,3 +1,4 @@
+/* exported MenuPopover */
 // -*- Mode: js; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*-
 //
 // Copyright (C) 2015  Daiki Ueno <dueno src gnome org>
@@ -16,7 +17,7 @@
 // along with this program; if not, write to the Free Software
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-const {GLib, GObject, Gtk} = imports.gi;
+const { GLib, GObject, Gtk } = imports.gi;
 
 var MenuPopover = GObject.registerClass({
     Template: 'resource:///org/gnome/Characters/menu.ui',
@@ -26,8 +27,10 @@ var MenuPopover = GObject.registerClass({
         const row = new Gtk.ListBoxRow();
         row.add_css_class('font');
         row._family = family;
-        let label = new Gtk.Label({ label: title,
-                                    halign: Gtk.Align.START });
+        let label = new Gtk.Label({
+            label: title,
+            halign: Gtk.Align.START,
+        });
         label.add_css_class('font-label');
         row.set_child(label);
         return row;
@@ -35,28 +38,29 @@ var MenuPopover = GObject.registerClass({
 
     _init() {
         super._init({});
-        let row = this._createFontListRow(_("None"), 'None');
-        this._font_listbox.append(row);
+        this._font_listbox.append(this._createFontListRow(_('None'), 'None'));
 
         let context = this.get_pango_context();
         let families = context.list_families();
-        families = families.sort(function(a, b) {
+        families = families.sort((a, b) => {
             return a.get_name().localeCompare(b.get_name());
         });
         for (let index in families) {
-            row = this._createFontListRow(families[index].get_name(),
-                                          families[index].get_name());
-            this._font_listbox.append(row);
+            let newRow = this._createFontListRow(families[index].get_name(),
+                families[index].get_name());
+            this._font_listbox.append(newRow);
         }
 
         this._keywords = [];
-        this._search_entry.connect('search-changed', (entry) => this._handleSearchChanged(entry));
-        this._font_listbox.connect('row-activated', (listBox, row) => this._handleRowActivated(listBox, 
row));
-        this._font_listbox.set_filter_func((row) => this._filterFunc(row));
+        this._search_entry.connect('search-changed', entry => this._handleSearchChanged(entry));
+        this._font_listbox.connect('row-activated', (_listBox, row) => {
+            this._handleRowActivated(row);
+        });
+        this._font_listbox.set_filter_func(row => this._filterFunc(row));
 
         // This silents warning at Characters exit about this widget being
         // visible but not mapped.  Borrowed from Maps.
-        this.connect('unmap', function(popover) {
+        this.connect('unmap', popover => {
             popover._font_listbox.unselect_all();
             popover.hide();
         });
@@ -64,14 +68,14 @@ var MenuPopover = GObject.registerClass({
 
     _handleSearchChanged(entry) {
         let text = entry.get_text().replace(/^\s+|\s+$/g, '');
-        let keywords = text == '' ? [] : text.split(/\s+/);
+        let keywords = text === '' ? [] : text.split(/\s+/);
         this._keywords = keywords.map(x => x.toLowerCase());
         this._font_listbox.invalidate_filter();
         return true;
     }
 
-    _handleRowActivated(listBox, row) {
-        if (row != null) {
+    _handleRowActivated(row) {
+        if (row !== null) {
             let toplevel = this.get_root();
             let action = toplevel.lookup_action('filter-font');
             action.activate(new GLib.Variant('s', row._family));
@@ -79,14 +83,14 @@ var MenuPopover = GObject.registerClass({
     }
 
     _filterFunc(row) {
-        if (this._keywords.length == 0)
+        if (this._keywords.length === 0)
             return true;
-        if (row._family == 'None')
+        if (row._family === 'None')
             return true;
 
         let nameWords = row._family.split(/\s+/).map(x => x.toLowerCase());
-        return this._keywords.every(function(keyword, index, array) {
-            return nameWords.some(function(nameWord, index, array) {
+        return this._keywords.every((keyword, _index, _array) => {
+            return nameWords.some((nameWord, __index, __array) => {
                 return nameWord.indexOf(keyword) >= 0;
             });
         });
diff --git a/src/meson.build b/src/meson.build
index eb44aee..f7ede14 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -13,7 +13,7 @@ scripts = [
 foreach script: scripts
   configure_file(
     input: script + '.in',
-    output: script,
+    output: '@BASENAME@',
     configuration: script_conf,
     install: true,
     install_dir: characters_pkgdatadir
diff --git a/src/org.gnome.Characters.BackgroundService.in b/src/org.gnome.Characters.BackgroundService.in
index 0b2339b..78859da 100755
--- a/src/org.gnome.Characters.BackgroundService.in
+++ b/src/org.gnome.Characters.BackgroundService.in
@@ -3,5 +3,5 @@ imports.package.init({ name: "org.gnome.Characters",
                        version: "@PACKAGE_VERSION@",
                        prefix: "@prefix@",
                        libdir: "@libdir@" });
-imports.service.application_id = "@appid@";
+imports.service.applicationId = "@appid@";
 imports.package.run(imports.service);
diff --git a/src/org.gnome.Characters.in b/src/org.gnome.Characters.in
index b6f14a2..ea9520b 100755
--- a/src/org.gnome.Characters.in
+++ b/src/org.gnome.Characters.in
@@ -3,5 +3,5 @@ imports.package.init({ name: "org.gnome.Characters",
                        version: "@PACKAGE_VERSION@",
                        prefix: "@prefix@",
                        libdir: "@libdir@" });
-imports.main.application_id = "@appid@";
+imports.main.applicationId = "@appid@";
 imports.package.run(imports.main);
diff --git a/src/searchProvider.js b/src/searchProvider.js
index 5b50864..910a1d6 100644
--- a/src/searchProvider.js
+++ b/src/searchProvider.js
@@ -1,3 +1,4 @@
+/* exported SearchProvider */
 // -*- Mode: js; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*-
 //
 // Copyright (c) 2013 Giovanni Campagna <scampa giovanni gmail com>
@@ -17,7 +18,7 @@
 // with Gnome Weather; if not, write to the Free Software Foundation,
 // Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
-const {Gc, Gdk, Gio, GLib, GObject} = imports.gi;
+const { Gc, Gdk, Gio, GLib, GObject } = imports.gi;
 
 const ByteArray = imports.byteArray;
 const Service = imports.service;
@@ -51,12 +52,12 @@ var SearchProvider = GObject.registerClass({
 
         let upper = keywords.map(x => x.toUpperCase());
         let criteria = Gc.SearchCriteria.new_keywords(upper);
-        let context = new Gc.SearchContext({ criteria: criteria,
-                                             flags: Gc.SearchFlag.WORD });
+        let context = new Gc.SearchContext({ criteria,
+            flags: Gc.SearchFlag.WORD });
         context.search(
             MAX_SEARCH_RESULTS,
             this._cancellable,
-            (source_object, res, user_data) => {
+            (sourceObject, res, _userData) => {
                 let characters = [];
                 try {
                     let result = context.search_finish(res);
@@ -90,19 +91,18 @@ var SearchProvider = GObject.registerClass({
             let codePoint = Util.toCodePoint(character);
             let codePointHex = codePoint.toString(16).toUpperCase();
             let name = Gc.character_name(character);
-            if (name == null)
-                name = _("Unknown character name");
+            if (name === null)
+                name = _('Unknown character name');
             else
                 name = Util.capitalize(name);
-            let summary = _("U+%s, %s: %s").format(codePointHex,
-                                                   character,
-                                                   name);
+            let summary = _('U+%s, %s: %s').format(codePointHex,
+                character,
+                name);
             ret.push({ name: new GLib.Variant('s', name),
-                       id: new GLib.Variant('s', identifiers[i]),
-                       description: new GLib.Variant('s', summary),
-                       icon: (new Gio.ThemedIcon({ name: Service.application_id })).serialize(),
-                       clipboardText: new GLib.Variant('s', character)
-                     });
+                id: new GLib.Variant('s', identifiers[i]),
+                description: new GLib.Variant('s', summary),
+                icon: new Gio.ThemedIcon({ name: Service.applicationId }).serialize(),
+                clipboardText: new GLib.Variant('s', character) });
         }
 
         this._app.release();
@@ -110,7 +110,7 @@ var SearchProvider = GObject.registerClass({
         return ret;
     }
 
-    ActivateResult(id, terms, timestamp) {
+    ActivateResult(id, _terms, _timestamp) {
         let clipboard = Gc.gtk_clipboard_get();
         clipboard.set_text(id, -1);
     }
@@ -122,7 +122,7 @@ var SearchProvider = GObject.registerClass({
 
         let app = Gio.DesktopAppInfo.new('org.gnome.Characters.desktop');
         let id = context.get_startup_notify_id(app, []);
-        return {'desktop-startup-id': new GLib.Variant('s', id) };
+        return { 'desktop-startup-id': new GLib.Variant('s', id) };
     }
 
     _activateAction(action, parameter, timestamp) {
@@ -133,26 +133,26 @@ var SearchProvider = GObject.registerClass({
             wrappedParam = [];
 
         Gio.DBus.session.call('org.gnome.Characters',
-                              '/org/gnome/Characters',
-                              'org.freedesktop.Application',
-                              'ActivateAction',
-                              new GLib.Variant('(sava{sv})', [action, wrappedParam,
-                                                              this._getPlatformData(timestamp)]),
-                              null,
-                              Gio.DBusCallFlags.NONE,
-                              -1, null, (connection, result) => {
-                                  try {
-                                      connection.call_finish(result);
-                                  } catch(e) {
-                                      log(`Failed to launch application: ${e.message}`);
-                                  }
-
-                                  this._app.release();
-                              });
+            '/org/gnome/Characters',
+            'org.freedesktop.Application',
+            'ActivateAction',
+            new GLib.Variant('(sava{sv})', [action, wrappedParam,
+                this._getPlatformData(timestamp)]),
+            null,
+            Gio.DBusCallFlags.NONE,
+            -1, null, (connection, result) => {
+                try {
+                    connection.call_finish(result);
+                } catch (e) {
+                    log(`Failed to launch application: ${e.message}`);
+                }
+
+                this._app.release();
+            });
     }
 
     LaunchSearch(terms, timestamp) {
         this._activateAction('search', new GLib.Variant('as', terms),
-                             timestamp);
+            timestamp);
     }
 });
diff --git a/src/service.js b/src/service.js
index 94da7d4..e66eb30 100644
--- a/src/service.js
+++ b/src/service.js
@@ -1,3 +1,4 @@
+/* exported applicationId main */
 // -*- Mode: js; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*-
 //
 // Copyright (c) 2012 Giovanni Campagna <scampa giovanni gmail com>
@@ -19,20 +20,19 @@
 
 pkg.initGettext();
 pkg.initFormat();
-pkg.require({ 'Gio': '2.0',
-              'GLib': '2.0',
-              'GObject': '2.0',
-              'Gtk': '3.0' });
+pkg.require({
+    'Gio': '2.0',
+    'GLib': '2.0',
+    'GObject': '2.0',
+    'Gtk': '3.0',
+});
 
-const Gio = imports.gi.Gio;
-const GLib = imports.gi.GLib;
-const Gtk = imports.gi.Gtk;
-const GObject = imports.gi.GObject;
+const { Gio, GLib, GObject, Gtk } = imports.gi;
 
 const Util = imports.util;
 const SearchProvider = imports.searchProvider;
 
-var application_id = pkg.name;
+var applicationId = pkg.name;
 
 const BackgroundService = GObject.registerClass({
     // This needs to be a Gtk.Application instead of Gio.Application,
@@ -40,9 +40,9 @@ const BackgroundService = GObject.registerClass({
 }, class BackgroundService extends Gtk.Application {
     _init() {
         super._init({ application_id: pkg.name,
-                      flags: Gio.ApplicationFlags.IS_SERVICE,
-                      inactivity_timeout: 30000 });
-        GLib.set_application_name(_("Characters"));
+            flags: Gio.ApplicationFlags.IS_SERVICE,
+            inactivity_timeout: 30000 });
+        GLib.set_application_name(_('Characters'));
 
         this._searchProvider = new SearchProvider.SearchProvider(this);
     }
@@ -58,7 +58,7 @@ const BackgroundService = GObject.registerClass({
         return true;
     }
 
-/*
+    /*
   Can't do until GApplication is fixed.
 
     vfunc_dbus_unregister(connection, path) {
@@ -71,9 +71,9 @@ const BackgroundService = GObject.registerClass({
     vfunc_startup() {
         super.vfunc_startup();
 
-        Util.initActions(this,
-                         [{ name: 'quit',
-                            activate: this._onQuit }]);
+        Util.initActions(this, [
+            { name: 'quit', activate: this._onQuit },
+        ]);
     }
 
     vfunc_activate() {
@@ -82,5 +82,5 @@ const BackgroundService = GObject.registerClass({
 });
 
 function main(argv) {
-    return (new BackgroundService()).run(argv);
+    return new BackgroundService().run(argv);
 }
diff --git a/src/util.js b/src/util.js
index e78b7c2..e52f03c 100644
--- a/src/util.js
+++ b/src/util.js
@@ -1,3 +1,4 @@
+/* exported capitalize getSettings initActions searchResultToArray toCodePoint */
 // -*- Mode: js; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*-
 //
 // Copyright (c) 2013 Giovanni Campagna <scampa giovanni gmail com>
@@ -24,14 +25,17 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-const {Gc, Gdk, Gio, GObject, Gtk} = imports.gi;
+const { Gc, Gio } = imports.gi;
 
-const Lang = imports.lang;
 const System = imports.system;
 
 function initActions(actionMap, simpleActionEntries, context) {
-    simpleActionEntries.forEach(({name, parameter_type, state, activate })=>  {
-        let action = new Gio.SimpleAction({name, parameter_type: parameter_type || null, state: state || 
null});
+    simpleActionEntries.forEach(({ name, parameterType, state, activate }) =>  {
+        let action = new Gio.SimpleAction({
+            name,
+            parameter_type: parameterType || null,
+            state: state || null,
+        });
 
         context = context || actionMap;
         if (activate)
@@ -48,37 +52,38 @@ function getSettings(schemaId, path) {
     if (!pkg.moduledir.startsWith('resource://')) {
         // Running from the source tree
         schemaSource = GioSSS.new_from_directory(pkg.pkgdatadir,
-                                                 GioSSS.get_default(),
-                                                 false);
+            GioSSS.get_default(),
+            false);
     } else {
         schemaSource = GioSSS.get_default();
     }
 
     let schemaObj = schemaSource.lookup(schemaId, true);
     if (!schemaObj) {
-        log('Missing GSettings schema ' + schemaId);
+        log(`Missing GSettings schema ${schemaId}`);
         System.exit(1);
     }
 
-    if (path === undefined)
+    if (path === undefined) {
         return new Gio.Settings({ settings_schema: schemaObj });
-    else
+    } else {
         return new Gio.Settings({ settings_schema: schemaObj,
-                                  path: path });
+            path });
+    }
 }
 
 function capitalizeWord(w) {
     if (w.length > 0)
-        return w[0].toUpperCase() + w.slice(1).toLowerCase()
+        return w[0].toUpperCase() + w.slice(1).toLowerCase();
     return w;
 }
 
 function capitalize(s) {
-    return s.split(/\s+/).map(function(w) {
-        let acronyms = ["CJK"];
+    return s.split(/\s+/).map(w => {
+        let acronyms = ['CJK'];
         if (acronyms.indexOf(w) > -1)
             return w;
-        let prefixes = ["IDEOGRAPH-", "SELECTOR-"];
+        let prefixes = ['IDEOGRAPH-', 'SELECTOR-'];
         for (let index in prefixes) {
             let prefix = prefixes[index];
             if (w.startsWith(prefix))
@@ -101,8 +106,8 @@ function toCodePoint(s) {
 
 function searchResultToArray(result) {
     let characters = [];
-    for (let index = 0; index < result.len; index++) {
+    for (let index = 0; index < result.len; index++)
         characters.push(Gc.search_result_get(result, index));
-    }
+
     return characters;
 }
diff --git a/src/window.js b/src/window.js
index 98f3cb0..25faf8e 100644
--- a/src/window.js
+++ b/src/window.js
@@ -1,3 +1,4 @@
+/* exported MainWindow */
 // -*- Mode: js; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*-
 //
 // Copyright (c) 2013 Giovanni Campagna <scampa giovanni gmail com>
@@ -24,12 +25,10 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-const {Adw, Gio, GLib, GObject, Gtk } = imports.gi;
+const { Adw, Gio, GLib, GObject, Gtk } = imports.gi;
 
-const {Sidebar, MainCategories} = imports.categoryList;
-const {CharacterDialog} = imports.characterDialog;
-const {CharactersView, FontFilter, RecentCharacterListView} = imports.charactersView;
-const {MenuPopover} = imports.menu;
+const { CharacterDialog } = imports.characterDialog;
+const { FontFilter, RecentCharacterListView } = imports.charactersView;
 const Gettext = imports.gettext;
 
 const Main = imports.main;
@@ -51,7 +50,7 @@ var MainWindow = GObject.registerClass({
         'max-recent-characters': GObject.ParamSpec.uint(
             'max-recent-characters', '', '',
             GObject.ParamFlags.READABLE | GObject.ParamFlags.WRITABLE,
-            0, GLib.MAXUINT32, 100)
+            0, GLib.MAXUINT32, 100),
     },
 }, class MainWindow extends Adw.ApplicationWindow {
     _init(application) {
@@ -74,10 +73,7 @@ var MainWindow = GObject.registerClass({
             this._leaflet.navigate(Adw.NavigationDirection.FORWARD);
         });
 
-        let characterList;
-
-
-        /*characterList = this._createCharacterList(
+        /* characterList = this._createCharacterList(
             'search-result', _('Search Result Character List'));
         // FIXME: Can't use GtkContainer.child_get_property.
         characterList.title = _("Search Result");
@@ -88,46 +84,43 @@ var MainWindow = GObject.registerClass({
         this.recentCharacters = recentCharacters.get_strv();
         this._maxRecentCharacters = 100;
         Main.settings.bind('max-recent-characters', this,
-                           'max-recent-characters',
-                           Gio.SettingsBindFlags.DEFAULT);
-
-
-        Util.initActions(this,
-                         [{ name: 'about',
-                            activate: this._about },
-                          { name: 'search-active',
-                            activate: this._toggleSearch,
-                            parameter_type: new GLib.VariantType('b'),
-                            state: new GLib.Variant('b', false) },
-                          { name: 'find',
-                            activate: this._find },
-                          { name: 'category',
-                            activate: this._category,
-                            parameter_type: new GLib.VariantType('s'),
-                            state: new GLib.Variant('s', 'emoji-smileys') },
-                          { name: 'character',
-                            activate: this._character,
-                            parameter_type: new GLib.VariantType('s') },
-                          { name: 'filter-font',
-                            activate: this._filterFont,
-                            parameter_type: new GLib.VariantType('s')
-                            },
-                            { 
-                                name: 'show-primary-menu',
-                                activate: this._togglePrimaryMenu,
-                                state: new GLib.Variant('b', false),
-                            }]);
+            'max-recent-characters',
+            Gio.SettingsBindFlags.DEFAULT);
+
+        Util.initActions(this, [
+            { name: 'about', activate: this._about },
+            { name: 'search-active',
+                activate: this._toggleSearch,
+                parameterType: new GLib.VariantType('b'),
+                state: new GLib.Variant('b', false) },
+            { name: 'find', activate: this._find },
+            { name: 'category',
+                activate: this._category,
+                parameterType: new GLib.VariantType('s'),
+                state: new GLib.Variant('s', 'emoji-smileys') },
+            { name: 'character',
+                activate: this._character,
+                parameterType: new GLib.VariantType('s') },
+            { name: 'filter-font',
+                activate: this._filterFont,
+                parameterType: new GLib.VariantType('s') },
+            {
+                name: 'show-primary-menu',
+                activate: this._togglePrimaryMenu,
+                state: new GLib.Variant('b', false),
+            },
+        ]);
 
         this.bind_property('search-active', this._search_active_button, 'active',
-                           GObject.BindingFlags.SYNC_CREATE |
+            GObject.BindingFlags.SYNC_CREATE |
                            GObject.BindingFlags.BIDIRECTIONAL);
         this.bind_property('search-active',
-                           this._search_bar,
-                           'search-mode-enabled',
-                           GObject.BindingFlags.SYNC_CREATE |
+            this._search_bar,
+            'search-mode-enabled',
+            GObject.BindingFlags.SYNC_CREATE |
                            GObject.BindingFlags.BIDIRECTIONAL);
         this._search_bar.connect_entry(this._search_entry);
-        this._search_entry.connect('search-changed', (entry) => this._handleSearchChanged(entry));
+        this._search_entry.connect('search-changed', entry => this._handleSearchChanged(entry));
 
         this._back_button.connect('clicked', () => {
             this._leaflet.navigate(Adw.NavigationDirection.BACK);
@@ -136,7 +129,7 @@ var MainWindow = GObject.registerClass({
         // Due to limitations of gobject-introspection wrt GdkEvent
         // and GdkEventKey, this needs to be a signal handler
         // TODO: use EventControllerKey
-        //this.connect('key-press-event', (self, event) => this._handleKeyPress(self, event));
+        // this.connect('key-press-event', (self, event) => this._handleKeyPress(self, event));
     }
 
     vfunc_map() {
@@ -151,19 +144,19 @@ var MainWindow = GObject.registerClass({
 
     // Select the first subcategory which contains at least one character.
     _selectFirstSubcategory() {
-        if (this.recentCharacters.length !== 0) {
+        if (this.recentCharacters.length !== 0)
             this._sidebar.selectRowByName('recent');
-        } else {
+        else
             this._sidebar.selectRowByName('smileys');
-        }
+
     }
 
-    get search_active() {
+    get searchActive() {
         return this._searchActive;
     }
 
-    set search_active(v) {
-        if (this._searchActive == v)
+    set searchActive(v) {
+        if (this._searchActive === v)
             return;
 
         this._searchActive = v;
@@ -171,7 +164,7 @@ var MainWindow = GObject.registerClass({
         if (this._searchActive) {
             let categoryList = this._sidebar.selectedList.list;
             categoryList.unselect_all();
-            this._updateTitle(_("Search Result"));
+            this._updateTitle(_('Search Result'));
         } else {
             this._sidebar.restorePreviousSelection();
         }
@@ -181,9 +174,9 @@ var MainWindow = GObject.registerClass({
 
     _handleSearchChanged(entry) {
         const text = entry.get_text().replace(/^\s+|\s+$/g, '');
-        let keywords = text == '' ? [] : text.split(/\s+/);
+        let keywords = text === '' ? [] : text.split(/\s+/);
         keywords = keywords.map(x => x.toUpperCase());
-        if (keywords != this._searchKeywords) {
+        if (keywords !== this._searchKeywords) {
             this.cancelSearch();
             this._searchKeywords = keywords;
             if (this._searchKeywords.length > 0)
@@ -200,23 +193,22 @@ var MainWindow = GObject.registerClass({
 
     _about() {
         const aboutDialog = new Gtk.AboutDialog(
-            { artists: [ 'Allan Day <allanpday gmail com>',
-                         'Jakub Steiner <jimmac gmail com>' ],
-              authors: [ 'Daiki Ueno <dueno src gnome org>',
-                         'Giovanni Campagna <scampa giovanni gmail com>' ],
-              // TRANSLATORS: put your names here, one name per line.
-              translator_credits: _("translator-credits"),
-              program_name: _("GNOME Characters"),
-              comments: _("Character Map"),
-              copyright: 'Copyright 2014-2018 Daiki Ueno',
-              license_type: Gtk.License.GPL_2_0,
-              logo_icon_name: Main.application_id,
-              version: pkg.version,
-              website: 'https://wiki.gnome.org/Apps/Characters',
-              wrap_license: true,
-              modal: true,
-              transient_for: this
-            });
+            { artists: ['Allan Day <allanpday gmail com>',
+                'Jakub Steiner <jimmac gmail com>'],
+            authors: ['Daiki Ueno <dueno src gnome org>',
+                'Giovanni Campagna <scampa giovanni gmail com>'],
+            // TRANSLATORS: put your names here, one name per line.
+            translator_credits: _('translator-credits'),
+            program_name: _('GNOME Characters'),
+            comments: _('Character Map'),
+            copyright: 'Copyright 2014-2018 Daiki Ueno',
+            license_type: Gtk.License.GPL_2_0,
+            logo_icon_name: Main.applicationId,
+            version: pkg.version,
+            website: 'https://wiki.gnome.org/Apps/Characters',
+            wrap_license: true,
+            modal: true,
+            transient_for: this });
 
         aboutDialog.show();
     }
@@ -224,45 +216,46 @@ var MainWindow = GObject.registerClass({
     _updateTitle(title) {
         if (this.filterFontFamily) {
             this._windowTitle.title =
-                _("%s (%s only)").format(Gettext.gettext(title),
-                                         this.filterFontFamily);
+                _('%s (%s only)').format(Gettext.gettext(title),
+                    this.filterFontFamily);
         } else {
             this._windowTitle.title = Gettext.gettext(title);
         }
     }
 
     _character(action, v) {
-        const [uc, length] = v.get_string();
+        const uc = v.get_string()[0];
         this.addToRecent(uc);
     }
 
     _filterFont(action, v) {
-        let [family, length] = v.get_string();
-        if (family == 'None')
+        let family = v.get_string()[0];
+        if (family === 'None')
             family = null;
         this.filterFontFamily = family;
-        //this._updateTitle(this._stack.visible_child.title);
+        // this._updateTitle(this._stack.visible_child.title);
         this._menuPopover.hide();
     }
 
     _find() {
-        this.search_active = !this.search_active;
+        this.searchActive = !this.searchActive;
     }
 
     setSearchKeywords(keywords) {
-        this.search_active = keywords.length > 0;
+        this.searchActive = keywords.length > 0;
         this._search_entry.set_text(keywords.join(' '));
     }
 
-    get max_recent_characters() {
+    get maxRecentCharacters() {
         return this._maxRecentCharacters;
     }
 
-    set max_recent_characters(v) {
+    set maxRecentCharacters(v) {
         this._maxRecentCharacters = v;
-        if (this.recentCharacters.length > this._maxRecentCharacters)
+        if (this.recentCharacters.length > this._maxRecentCharacters) {
             this.recentCharacters = this.recentCharacters.slice(
                 0, this._maxRecentCharacters);
+        }
     }
 
     get filterFontFamily() {
@@ -274,9 +267,9 @@ var MainWindow = GObject.registerClass({
         this._fontFilter.setFilterFont(this._filterFontFamily);
     }
 
-    _createRecentCharacterList(name, accessible_name, category) {
+    _createRecentCharacterList(name, accessibleName, category) {
         const characterList = new RecentCharacterListView(category, this._fontFilter);
-        //characterList.get_accessible().accessible_name = accessible_name;
+        // characterList.get_accessible().accessible_name = accessibleName;
         characterList.connect('character-selected', (widget, uc) => this._handleCharacterSelected(widget, 
uc));
 
         this._characterLists[name] = characterList;
@@ -289,46 +282,45 @@ var MainWindow = GObject.registerClass({
     }
 
     cancelSearch() {
-        const characterList = this.mainStack.get_child_by_name('search-result');
+        const characterList = this._mainStack.get_child_by_name('search-result');
         characterList.cancelSearch();
     }
 
     setPage(pageRow) {
         if (pageRow.name === 'recent') {
-            if (this.recentCharacters.length === 0)
+            if (this.recentCharacters.length === 0) {
                 this._mainStack.visible_child_name = 'empty-recent';
-            else {
+            } else {
                 this._charactersView.setCharacters(this.recentCharacters);
-                this._mainStack.visible_child_name = 'recent';
+                this._mainStack.visible_child_name = 'character-list';
             }
         } else {
             this._charactersView.searchByCategory(pageRow.category);
             this._mainStack.visible_child_name = 'character-list';
-            //this._charactersView.model = pageRow.model;
+            // this._charactersView.model = pageRow.model;
         }
     }
 
     addToRecent(uc) {
         if (this.recentCharacters.indexOf(uc) < 0) {
             this.recentCharacters.unshift(uc);
-            if (this.recentCharacters.length > this._maxRecentCharacters)
+            if (this.recentCharacters.length > this._maxRecentCharacters) {
                 this.recentCharacters = this.recentCharacters.slice(
                     0, this._maxRecentCharacters);
+            }
             Main.settings.set_value(
                 'recent-characters',
                 GLib.Variant.new_strv(this.recentCharacters));
         }
     }
 
-    _addToRecent(widget, uc) {
-        this.addToRecent(uc);
-    }
-
     _handleCharacterSelected(widget, uc) {
         const dialog = new CharacterDialog(uc, this._fontFilter.fontDescription);
         dialog.set_modal(true);
         dialog.set_transient_for(this.get_root());
-        dialog.connect('character-copied', (widget, uc) => this._addToRecent(widget, uc));
+        dialog.connect('character-copied', (_widget, char) => {
+            this.addToRecent(char);
+        });
         dialog.show();
     }
 });


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