diff --git a/src/service/systemtray.ts b/src/service/systemtray.ts
index ec60210..937ff64 100644
--- a/src/service/systemtray.ts
+++ b/src/service/systemtray.ts
@@ -14,7 +14,10 @@ const StatusNotifierItemIFace = loadInterfaceXML('org.kde.StatusNotifierItem')!;
 const StatusNotifierItemProxy =
     Gio.DBusProxy.makeProxyWrapper(StatusNotifierItemIFace) as unknown as StatusNotifierItemProxy;
 
-const DbusMenu = mkCtor < DbusmenuGtk3.Menu.ConstructorProperties > (DbusmenuGtk3.Menu, 'DbusMenu');
+const DbusMenu = mkCtor<
+    typeof DbusmenuGtk3.Menu,
+    DbusmenuGtk3.Menu.ConstructorProperties
+>(DbusmenuGtk3.Menu, 'DbusMenu');
 
 export class TrayItem extends Service {
     static {
@@ -122,7 +125,7 @@ export class TrayItem extends Service {
                 dbus_name: proxy.g_name_owner,
                 dbus_object: proxy.Menu,
             });
-            this.menu = menu as unknown as DbusmenuGtk3.Menu;
+            this.menu = (menu as unknown) as DbusmenuGtk3.Menu;
         }
 
         if (this._proxy.IconThemePath) {
@@ -169,7 +172,7 @@ export class TrayItem extends Service {
                 const variant = proxy?.call_finish(result) as GLib.Variant;
                 if (!variant)
                     return;
-                const [properties] = variant.deepUnpack < Record < string, GLib.Variant> [] > ();
+                const [properties] = variant.deepUnpack < Record < string, GLib.Variant> [] >();
                 Object.entries(properties).map(([propertyName, value]) => {
                     this._proxy.set_cached_property(propertyName, value);
                 });
diff --git a/src/widget.ts b/src/widget.ts
index 51cb665..17441cb 100644
--- a/src/widget.ts
+++ b/src/widget.ts
@@ -16,41 +16,43 @@ import AgsEntry, { type EntryProps } from './widgets/entry.js';
 import { AgsMenu, AgsMenuItem, type MenuProps, type MenuItemProps } from './widgets/menu.js';
 import AgsWindow, { type WindowProps } from './widgets/window.js';
 import AgsCircularProgress, { type CircularProgressProps } from './widgets/circularprogress.js';
+import Gtk from 'gi://Gtk?version=3.0';
 
-export function mkCtor<Props>(w: new (...args: Props[]) => any, name?: string) {
-    const Ctor = AgsWidget(w, name);
-    return (props: Props & BaseProps<Props>) => new Ctor(props);
+export function mkCtor<W extends typeof Gtk.Widget, Props>(w: W, name?: string) {
+    const Ctor = AgsWidget<W, Props>(w, name);
+    return (props: Props & BaseProps<typeof w>) => new Ctor(props);
 }
 
-export const Box = mkCtor<BoxProps>(AgsBox, 'AgsBox');
-export const Button = mkCtor<ButtonProps>(AgsButton, 'AgsButton');
-export const CenterBox = mkCtor<CenterBoxProps>(AgsCenterBox, 'AgsCenterBox');
-export const CircularProgress = mkCtor<CircularProgressProps>(AgsCircularProgress, 'AgsCircularProgress');
-export const Entry = mkCtor<EntryProps>(AgsEntry, 'AgsEntry');
-export const EventBox = mkCtor<EventBoxProps>(AgsEventBox, 'AgsEventBox');
-export const Icon = mkCtor<IconProps>(AgsIcon, 'AgsIcon');
-export const Label = mkCtor<LabelProps>(AgsLabel, 'AgsLabel');
-export const Menu = mkCtor<MenuProps>(AgsMenu, 'AgsMenu');
-export const MenuItem = mkCtor<MenuItemProps>(AgsMenuItem, 'AgsMenuItem');
-export const Overlay = mkCtor<OverlayProps>(AgsOverlay, 'AgsOverlay');
-export const ProgressBar = mkCtor<ProgressBarProps>(AgsProgressBar, 'AgsProgressBar');
-export const Revealer = mkCtor<RevealerProps>(AgsRevealer, 'AgsRevealer');
-export const Scrollable = mkCtor<ScrollableProps>(AgsScrollable, 'AgsScrollable');
-export const Slider = mkCtor<SliderProps>(AgsSlider, 'AgsSlider');
-export const Stack = mkCtor<StackProps>(AgsStack, 'AgsStack');
-export const Window = mkCtor<WindowProps>(AgsWindow, 'AgsWindow');
+// @ts-ignore
+export const Window = mkCtor<typeof AgsWindow, WindowProps>(AgsWindow, 'AgsWindow');
+export const Box = mkCtor<typeof AgsBox, BoxProps>(AgsBox, 'AgsBox');
+export const Button = mkCtor<typeof AgsButton, ButtonProps>(AgsButton, 'AgsButton');
+export const CenterBox = mkCtor<typeof AgsCenterBox, CenterBoxProps>(AgsCenterBox, 'AgsCenterBox');
+export const CircularProgress = mkCtor<typeof AgsCircularProgress, CircularProgressProps>(AgsCircularProgress, 'AgsCircularProgress');
+export const Entry = mkCtor<typeof AgsEntry, EntryProps>(AgsEntry, 'AgsEntry');
+export const EventBox = mkCtor<typeof AgsEventBox, EventBoxProps>(AgsEventBox, 'AgsEventBox');
+export const Icon = mkCtor<typeof AgsIcon, IconProps>(AgsIcon, 'AgsIcon');
+export const Label = mkCtor<typeof AgsLabel, LabelProps>(AgsLabel, 'AgsLabel');
+export const Menu = mkCtor<typeof AgsMenu, MenuProps>(AgsMenu, 'AgsMenu');
+export const MenuItem = mkCtor<typeof AgsMenuItem, MenuItemProps>(AgsMenuItem, 'AgsMenuItem');
+export const Overlay = mkCtor<typeof AgsOverlay, OverlayProps>(AgsOverlay, 'AgsOverlay');
+export const ProgressBar = mkCtor<typeof AgsProgressBar, ProgressBarProps>(AgsProgressBar, 'AgsProgressBar');
+export const Revealer = mkCtor<typeof AgsRevealer, RevealerProps>(AgsRevealer, 'AgsRevealer');
+export const Scrollable = mkCtor<typeof AgsScrollable, ScrollableProps>(AgsScrollable, 'AgsScrollable');
+export const Slider = mkCtor<typeof AgsSlider, SliderProps>(AgsSlider, 'AgsSlider');
+export const Stack = mkCtor<typeof AgsStack, StackProps>(AgsStack, 'AgsStack');
 
 const ctors = new Map();
 
 // TODO: figure out how to type this
 export function Widget<Props>({ type, ...props }: {
-    type: new (props: Props) => any,
+    type: any
 }) {
     let Ctor;
     if (ctors.has(type)) {
         Ctor = ctors.get(type);
     } else {
-        Ctor = mkCtor<Props>(type);
+        Ctor = mkCtor<typeof type, Props>(type);
         ctors.set(type, Ctor);
     }
 
diff --git a/src/widgets/icon.ts b/src/widgets/icon.ts
index 84399d9..84731fb 100644
--- a/src/widgets/icon.ts
+++ b/src/widgets/icon.ts
@@ -6,11 +6,13 @@ import Gdk from 'gi://Gdk?version=3.0';
 import Service from '../service.js';
 import cairo from '@girs/cairo-1.0';
 
-export interface IconProps extends Gtk.Image.ConstructorProperties {
+interface Props extends Gtk.Image.ConstructorProperties {
     icon?: string | GdkPixbuf.Pixbuf
     size?: number
 }
 
+export type IconProps = Props | string | GdkPixbuf.Pixbuf | undefined
+
 export default class AgsIcon extends Gtk.Image {
     static {
         GObject.registerClass({
diff --git a/src/widgets/label.ts b/src/widgets/label.ts
index a52b72f..416c865 100644
--- a/src/widgets/label.ts
+++ b/src/widgets/label.ts
@@ -7,11 +7,13 @@ import Service from '../service.js';
 const justifications = ['left', 'center', 'right', 'fill'];
 const truncates = ['none', 'start', 'middle', 'end'];
 
-export interface LabelProps extends Gtk.Label.ConstructorProperties {
+interface Props extends Gtk.Label.ConstructorProperties {
     justification?: string
     truncate?: string
 }
 
+export type LabelProps = Props | string | undefined
+
 export default class AgsLabel extends Gtk.Label {
     static {
         GObject.registerClass({
@@ -22,7 +24,7 @@ export default class AgsLabel extends Gtk.Label {
         }, this);
     }
 
-    constructor(params: LabelProps | string) {
+    constructor(params: LabelProps) {
         super(typeof params === 'string' ? { label: params } : params);
     }
 
diff --git a/src/widgets/widget.ts b/src/widgets/widget.ts
index fec390a..3cb188b 100644
--- a/src/widgets/widget.ts
+++ b/src/widgets/widget.ts
@@ -31,184 +31,208 @@ export interface BaseProps<Self> {
     setup?: (self: Self) => void
 }
 
-export default (W: new (...args: any[]) => any, GTypeName?: string) => class extends W {
-    static {
-        GObject.registerClass({
-            ...(GTypeName ? { GTypeName } : {}),
-            Properties: {
-                'class-name': Service.pspec('class-name', 'string', 'rw'),
-                'class-names': Service.pspec('class-names', 'jsobject', 'rw'),
-                'css': Service.pspec('css', 'string', 'rw'),
-            },
-        }, this);
-    }
+export default function <T extends typeof Gtk.Widget, Props>(W: T, GTypeName?: string) {
+    // @ts-expect-error mixin constructor
+    return class AgsWidget extends W {
+        static {
+            GObject.registerClass({
+                GTypeName: GTypeName || `${W.name}`,
+                Properties: {
+                    'class-name': Service.pspec('class-name', 'string', 'rw'),
+                    'class-names': Service.pspec('class-names', 'jsobject', 'rw'),
+                    'css': Service.pspec('css', 'string', 'rw'),
+                },
+            }, this);
+        }
 
-    constructor(params: BaseProps<InstanceType<typeof W>> | unknown) {
-        const {
-            connections = [],
-            properties = [],
-            binds = [],
-            style,
-            halign,
-            valign,
-            setup,
-            ...rest
-        } = params as BaseProps<InstanceType<typeof W>>;
-        super(typeof params === 'string' ? params : rest);
+        constructor(params: BaseProps<T> & Props | any) {
+            const {
+                connections = [],
+                properties = [],
+                binds = [],
+                style,
+                halign,
+                valign,
+                setup,
+                ...rest
+            } = params as BaseProps<T> & Props;
+            super(typeof params === 'object' ? rest : params);
 
-        this.style = style!;
-        this.halign = halign!;
-        this.valign = valign!;
+            this.style = style!;
+            this.halign = halign!;
+            this.valign = valign!;
 
-        properties.forEach(([key, value]) => {
-            this[`_${key}`] = value;
-        });
+            properties.forEach(([key, value]) => {
+                (this as unknown as { [key: string]: unknown })[`_${key}`] = value;
+            });
 
-        binds.forEach(([prop, obj, objProp = 'value', transform = out => out]) => {
-            if (!prop || !obj) {
-                console.error(Error('missing arguments to binds'));
+            binds.forEach(([prop, obj, objProp = 'value', transform = out => out]) => {
+                if (!prop || !obj) {
+                    console.error(Error('missing arguments to binds'));
+                    return;
+                }
+
+                // @ts-expect-error
+                const callback = () => this[prop] = transform(obj[objProp]);
+                connections.push([obj, callback, `notify::${objProp}`]);
+            });
+
+            connections.forEach(([s, callback, event]) => {
+                if (!s || !callback) {
+                    console.error(Error('missing arguments to connections'));
+                    return;
+                }
+
+                if (typeof s === 'string')
+                    this.connect(s, callback);
+
+                else if (typeof s === 'number')
+                    interval(s, () => callback(this as any), this as unknown as Gtk.Widget);
+
+                else if (s instanceof GObject.Object)
+                    connect(s, this as unknown as Gtk.Widget, callback as any, event);
+
+                else
+                    console.error(Error(`${s} is not a GObject nor a string nor a number`));
+            });
+
+            if (typeof setup === 'function')
+                setup(this as any);
+        }
+
+        toggleClassName(className: string, condition = true) {
+            condition
+                ? this.get_style_context().add_class(className)
+                : this.get_style_context().remove_class(className);
+        }
+
+        // @ts-expect-error prop override
+        get halign() { return aligns[super.halign]; }
+
+        // @ts-expect-error prop override
+        set halign(align: string) {
+            if (!align)
+                return;
+
+            if (!aligns.includes(align)) {
+                console.error(new Error(`halign has to be on of ${aligns}`));
                 return;
             }
 
+            super.halign = aligns.findIndex(a => a === align);
+        }
+
+        // @ts-expect-error prop override
+        get valign() { return aligns[super.valign]; }
+
+        // @ts-expect-error prop override
+        set valign(align: string) {
+            if (!align)
+                return;
+
+            if (!aligns.includes(align)) {
+                console.error(new Error(`valign has to be on of ${aligns}`));
+                return;
+            }
+
+            super.valign = aligns.findIndex(a => a === align);
+        }
+
+        get class_name() {
+            // @ts-expect-error
+            return this._className || '';
+        }
+
+        set class_name(names: string) {
+            // @ts-expect-error
+            this._className = names;
+            this.class_names = names.split(/\s+/);
+            this.notify('class-name');
+        }
+
+        get class_names() {
+            // @ts-expect-error
+            return this._classNames || [];
+        }
+
+        set class_names(names: string[]) {
+            this.class_names.forEach((cn: string) => this.toggleClassName(cn, false));
+
             // @ts-expect-error
-            const callback = () => this[prop] = transform(obj[objProp]);
-            connections.push([obj, callback, `notify::${objProp}`]);
-        });
+            this._classNames = names.map(cn => {
+                this.toggleClassName(cn);
+                return cn;
+            });
 
-        connections.forEach(([s, callback, event]) => {
-            if (!s || !callback) {
-                console.error(Error('missing arguments to connections'));
+            this.notify('class-names');
+        }
+
+        setCss(css: string) {
+            const previous = widgetProviders.get(this);
+            if (previous)
+                this.get_style_context().remove_provider(previous);
+
+            const provider = new Gtk.CssProvider();
+            widgetProviders.set(this, provider);
+            provider.load_from_data(new TextEncoder().encode(css));
+            this.get_style_context()
+                .add_provider(provider, Gtk.STYLE_PROVIDER_PRIORITY_USER);
+
+            this.notify('css');
+        }
+
+        setStyle(css: string) {
+            this.setCss(`* { ${css} }`);
+            this.notify('style');
+        }
+
+        // @ts-expect-error prop override
+        get style() { return this._style || ''; }
+
+        // @ts-expect-error prop override
+        set style(css: string) {
+            if (!css)
                 return;
-            }
 
-            if (typeof s === 'string')
-                this.connect(s, callback);
+            // @ts-expect-error
+            this._style = css;
+            this.setCss(`* { ${css} }`);
+            this.notify('style');
+        }
 
-            else if (typeof s === 'number')
-                interval(s, () => callback(this), this as unknown as Gtk.Widget);
+        // @ts-expect-error
+        get css() { return this._css || ''; }
+        set css(css: string) {
+            if (!css)
+                return;
 
-            else if (s instanceof GObject.Object)
-                connect(s, this as unknown as Gtk.Widget, callback, event);
+            // @ts-expect-error
+            this._css = css;
+            this.setCss(css);
+            this.notify('css');
+        }
 
+        get child(): Gtk.Widget | null {
+            // @ts-expect-error
+            if (typeof this.get_child === 'function')
+                // @ts-expect-error
+                return this.get_child();
+
+            return null;
+        }
+
+        set child(child: Gtk.Widget) {
+            // @ts-expect-error
+            if (typeof this.set_child === 'function')
+                // @ts-expect-error
+                this.set_child(child);
             else
-                console.error(Error(`${s} is not a GObject nor a string nor a number`));
-        });
-
-        if (typeof setup === 'function')
-            setup(this);
-    }
-
-    toggleClassName(className: string, condition = true) {
-        condition
-            ? this.get_style_context().add_class(className)
-            : this.get_style_context().remove_class(className);
-    }
-
-    get halign() { return aligns[super.halign]; }
-    set halign(align: string) {
-        if (!align)
-            return;
-
-        if (!aligns.includes(align)) {
-            console.error(new Error(`halign has to be on of ${aligns}`));
-            return;
+                console.error(new Error(`can't set child on ${this}`));
         }
 
-        super.halign = aligns.findIndex(a => a === align);
-    }
-
-    get valign() { return aligns[super.valign]; }
-    set valign(align: string) {
-        if (!align)
-            return;
-
-        if (!aligns.includes(align)) {
-            console.error(new Error(`valign has to be on of ${aligns}`));
-            return;
+        // @ts-expect-error prop override
+        get parent(): Gtk.Container | null {
+            return this.get_parent() as Gtk.Container || null;
         }
-
-        super.valign = aligns.findIndex(a => a === align);
-    }
-
-    get class_name() {
-        return this._className || '';
-    }
-
-    set class_name(names: string) {
-        this._className = names;
-        this.class_names = names.split(/\s+/);
-        this.notify('class-name');
-    }
-
-    get class_names() {
-        return this._classNames || [];
-    }
-
-    set class_names(names: string[]) {
-        this.class_names.forEach((cn: string) => this.toggleClassName(cn, false));
-
-        this._classNames = names.map(cn => {
-            this.toggleClassName(cn);
-            return cn;
-        });
-
-        this.notify('class-names');
-    }
-
-    setCss(css: string) {
-        const previous = widgetProviders.get(this);
-        if (previous)
-            this.get_style_context().remove_provider(previous);
-
-        const provider = new Gtk.CssProvider();
-        widgetProviders.set(this, provider);
-        provider.load_from_data(new TextEncoder().encode(css));
-        this.get_style_context()
-            .add_provider(provider, Gtk.STYLE_PROVIDER_PRIORITY_USER);
-
-        this.notify('css');
-    }
-
-    setStyle(css: string) {
-        this.setCss(`* { ${css} }`);
-        this.notify('style');
-    }
-
-    get style() { return this._style || ''; }
-    set style(css: string) {
-        if (!css)
-            return;
-
-        this.setCss(`* { ${css} }`);
-        this._style = css;
-        this.notify('style');
-    }
-
-    get css() { return this._css || ''; }
-    set css(css: string) {
-        if (!css)
-            return;
-
-        this.setCss(css);
-        this._css = css;
-        this.notify('css');
-    }
-
-    get child(): Gtk.Widget | null {
-        if (typeof this.get_child === 'function')
-            return this.get_child();
-
-        return null;
-    }
-
-    set child(child: Gtk.Widget) {
-        if (typeof this.set_child === 'function')
-            this.set_child(child);
-        else
-            console.error(new Error(`can't set child on ${this}`));
-    }
-
-    get parent() {
-        return this.get_parent();
-    }
-};
+    };
+}