docs: better explain ags

10 files changed, 2055 insertions, 0 deletions

diff --git a/docs/guide/typescript/binding.md b/docs/guide/typescript/binding.md
new file mode 100644
index 0000000..05645ab
--- /dev/null
+++ b/docs/guide/typescript/binding.md
@@ -0,0 +1,235 @@
+# Binding
+
+As mentioned before binding an object's state to another -
+so in most cases a `Variable` or a `GObject.Object` property to a widget's property -
+is done through the `bind` function which returns a `Binding` object.
+
+`Binding` objects simply hold information about the source and how it should be transformed
+which Widget constructors can use to setup a connection between themselves and the source.
+
+```ts
+class Binding<Value> {
+    private transformFn: (v: any) => unknown
+    private emitter: Subscribable<Value> | Connectable
+    private prop?: string
+
+    as<T>(fn: (v: Value) => T): Binding<T>
+    get(): Value
+    subscribe(callback: (value: Value) => void): () => void
+}
+```
+
+A `Binding` can be constructed from an object implementing
+the `Subscribable` interface (usually a `Variable`)
+or an object implementing the `Connectable` interface and one of its properties
+(usually a `GObject.Object` instance).
+
+```ts
+function bind<T>(obj: Subscribable): Binding<T>
+
+function bind<
+  Obj extends Connectable,
+  Prop extends keyof Obj,
+>(obj: Obj, prop: Prop): Binding<Obj[Prop]>
+```
+
+## Subscribable and Connectable interface
+
+Any object implementing one of these interfaces can be used with `bind`.
+
+```ts
+interface Subscribable<T> {
+    subscribe(callback: (value: T) => void): () => void
+    get(): T
+}
+
+interface Connectable {
+    connect(signal: string, callback: (...args: any[]) => unknown): number
+    disconnect(id: number): void
+}
+```
+
+## Example Custom Subscribable
+
+When binding the children of a box from an array, usually not all elements
+of the array changes each time, so it would make sense to not destroy
+the widget which represents the element.
+
+::: code-group
+
+```ts :line-numbers [varmap.ts]
+import { type Subscribable } from "astal/binding"
+import { Gtk } from "astal"
+
+export class VarMap<K, T = Gtk.Widget> implements Subscribable {
+    #subs = new Set<(v: Array<[K, T]>) => void>()
+    #map: Map<K, T>
+
+    #notifiy() {
+        const value = this.get()
+        for (const sub of this.#subs) {
+            sub(value)
+        }
+    }
+
+    #delete(key: K) {
+        const v = this.#map.get(key)
+
+        if (v instanceof Gtk.Widget) {
+            v.destroy()
+        }
+
+        this.#map.delete(key)
+    }
+
+    constructor(initial?: Iterable<[K, T]>) {
+        this.#map = new Map(initial)
+    }
+
+    set(key: K, value: T) {
+        this.#delete(key)
+        this.#map.set(key, value)
+        this.#notifiy()
+    }
+
+    delete(key: K) {
+        this.#delete(key)
+        this.#notifiy()
+    }
+
+    get() {
+        return [...this.#map.entries()]
+    }
+
+    subscribe(callback: (v: Array<[K, T]>) => void) {
+        this.#subs.add(callback)
+        return () => this.#subs.delete(callback)
+    }
+}
+```
+
+:::
+
+And this `VarMap<key, Widget>` can be used as an alternative to `Variable<Array<Widget>>`.
+
+```tsx
+function MappedBox() {
+    const map = new VarMap([
+        [1, <MyWidget id={id} />]
+        [2, <MyWidget id={id} />]
+    ])
+
+    const conns = [
+        gobject.connect("added", (_, id) => map.set(id, MyWidget({ id }))),
+        gobject.connect("removed", (_, id) => map.delete(id, MyWidget({ id }))),
+    ]
+
+    return <box onDestroy={() => conns.map(id => gobject.disconnect(id))}>
+        {bind(map).as(arr => arr.sort(([a], [b]) => a - b).map(([,w]) => w))}
+    </box>
+}
+```
+
+## Example Custom Connectable
+
+Astal provides [decorator functions](./gobject#example-usage)
+that make it easy to subclass gobjects, however
+you can read more about GObjects and subclassing
+on [gjs.guide](https://gjs.guide/guides/gobject/subclassing.html#gobject-subclassing).
+
+Objects coming from [libraries](../libraries/references#astal-libraries)
+usually have a singleton gobject you can access with `.get_default()`.
+
+Here is an example of a Brightness library by wrapping the `brightnessctl` cli utility
+and by monitoring `/sys/class/backlight`
+
+::: code-group
+
+```ts :line-numbers [brightness.ts]
+import GObject, { register, property } from "astal/gobject"
+import { monitorFile, readFileAsync } from "astal/file"
+import { exec, execAsync } from "astal/process"
+
+const get = (args: string) => Number(exec(`brightnessctl ${args}`))
+const screen = exec(`bash -c "ls -w1 /sys/class/backlight | head -1"`)
+const kbd = exec(`bash -c "ls -w1 /sys/class/leds | head -1"`)
+
+@register({ GTypeName: "Brightness" })
+export default class Brightness extends GObject.Object {
+    static instance: Brightness
+    static get_default() {
+        if (!this.instance)
+            this.instance = new Brightness()
+
+        return this.instance
+    }
+
+    #kbdMax = get(`--device ${kbd} max`)
+    #kbd = get(`--device ${kbd} get`)
+    #screenMax = get("max")
+    #screen = get("get") / (get("max") || 1)
+
+    @property(Number)
+    get kbd() { return this.#kbd }
+
+    set kbd(value) {
+        if (value < 0 || value > this.#kbdMax)
+            return
+
+        execAsync(`brightnessctl -d ${kbd} s ${value} -q`).then(() => {
+            this.#kbd = value
+            this.notify("kbd")
+        })
+    }
+
+    @property(Number)
+    get screen() { return this.#screen }
+
+    set screen(percent) {
+        if (percent < 0)
+            percent = 0
+
+        if (percent > 1)
+            percent = 1
+
+        execAsync(`brightnessctl set ${Math.floor(percent * 100)}% -q`).then(() => {
+            this.#screen = percent
+            this.notify("screen")
+        })
+    }
+
+    constructor() {
+        super()
+
+        const screenPath = `/sys/class/backlight/${screen}/brightness`
+        const kbdPath = `/sys/class/leds/${kbd}/brightness`
+
+        monitorFile(screenPath, async f => {
+            const v = await readFileAsync(f)
+            this.#screen = Number(v) / this.#screenMax
+            this.notify("screen")
+        })
+
+        monitorFile(kbdPath, async f => {
+            const v = await readFileAsync(f)
+            this.#kbd = Number(v) / this.#kbdMax
+            this.notify("kbd")
+        })
+    }
+}
+```
+
+:::
+
+And it can be used like any other library object.
+
+```tsx
+function BrightnessSlider() {
+    const brightness = Brightness.get_default()
+
+    return <slider
+        value={bind(brightness, "screen")}
+        onDragged={({ value }) => brightness.screen = value}
+    />
+}
+```
diff --git a/docs/guide/typescript/cli-app.md b/docs/guide/typescript/cli-app.md
new file mode 100644
index 0000000..3407e06
--- /dev/null
+++ b/docs/guide/typescript/cli-app.md
@@ -0,0 +1,174 @@
+# CLI and App
+
+`App` is a singleton **instance** of an [Astal.Application](https://aylur.github.io/libastal/class.Application.html).
+
+Depending on gtk version import paths will differ
+
+```ts
+import { App } from "astal/gtk3"
+
+import { App } from "astal/gtk4"
+```
+
+## Entry point
+
+:::code-group
+
+```ts [app.ts]
+App.start({
+    main() {
+        // setup anything
+        // instantiate widgets
+    },
+})
+```
+
+:::
+
+## Instance identifier
+
+You can run multiple instance by defining a unique instance name.
+
+```ts
+App.start({
+    instanceName: "my-instance", // defaults to "astal"
+    main() { },
+})
+```
+
+## Messaging from CLI
+
+If you want to interact with an instance from the CLI,
+you can do so by sending a message.
+
+```ts
+App.start({
+    requestHandler(request: string, res: (response: any) => void) {
+        if (request == "say hi") {
+            res("hi cli")
+        }
+        res("unknown command")
+    },
+    main() { },
+})
+```
+
+:::code-group
+
+```sh [astal]
+astal say hi
+# hi cli
+```
+
+```sh [ags]
+ags -m "say hi"
+# hi cli
+```
+
+:::
+
+If you want to run arbitrary JavaScript from CLI, you can use `App.eval`
+which will evaluate the passed string as the body of an `async` function.
+
+```ts
+App.start({
+    main() {},
+    requestHandler(js, res) {
+        App.eval(js).then(res).catch(res)
+    },
+})
+```
+
+If the string does not contain a semicolon, a single expression is assumed and returned implicity.
+
+```sh
+astal "'hello'"
+# hello
+```
+
+If the string contains a semicolon, you have to return explicitly
+
+```sh
+astal "'hello';"
+# undefined
+
+astal "return 'hello';"
+# hello
+```
+
+## Toggling Windows by their name
+
+In order for Astal to know about your windows, you have to register them.
+You can do this by specifying a **unique** `name` and calling `App.add_window`
+
+```tsx {4}
+import { App } from "astal"
+
+function Bar() {
+    return <window name="Bar" setup={self => App.add_window(self)}>
+        <box />
+    </window>
+}
+```
+
+You can also invoke `App.add_window` by simply passing the `App` to the `application` prop.
+
+```tsx {4}
+import { App } from "astal"
+
+function Bar() {
+    return <window name="Bar" application={App}>
+        <box />
+    </window>
+}
+```
+
+:::warning
+When assigning the `application` prop make sure `name` comes before.
+Props are set sequentially and if name is applied after application it won't work.
+:::
+
+:::code-group
+
+```sh [astal]
+astal -t Bar
+```
+
+```sh [ags]
+ags -t Bar
+```
+
+:::
+
+## Bundled scripts
+
+The produced scripts when bundling can run as the main instance
+and a "client" instance.
+
+The first time you execute your bundled script the `main` function gets called.
+While that instance is running any subsequent execution of the script will call
+the `client` function.
+
+:::code-group
+
+```ts [main.ts]
+App.start({
+    // main instance
+    main(...args: Array<string>) {
+        print(...args)
+    },
+
+    // every subsequent calls
+    client(message: (msg: string) => string, ...args: Array<string>) {
+        const res = message("you can message the main instance")
+        console.log(res)
+    },
+
+    // this runs in the main instance
+    requestHandler(request: string, res: (response: any) => void) {
+        res("response from main")
+    },
+})
+```
+
+:::
diff --git a/docs/guide/typescript/faq.md b/docs/guide/typescript/faq.md
new file mode 100644
index 0000000..76d8e72
--- /dev/null
+++ b/docs/guide/typescript/faq.md
@@ -0,0 +1,266 @@
+# Frequently asked question, common issues, tips and tricks
+
+## Monitor id does not match compositor
+
+The monitor id property that windows expect is mapped by Gdk, which is not always
+the same as the compositor. Instead use the `gdkmonitor` property which expects
+a `Gdk.Monitor` object.
+
+```tsx
+import { App } from "astal"
+
+function Bar(gdkmonitor) {
+    return <window gdkmonitor={gdkmonitor} />
+}
+
+function main() {
+    for (const monitor of App.get_monitors()) {
+        if (monitor.model == "your-desired-model") {
+            Bar(monitor)
+        }
+    }
+}
+
+App.start({ main })
+```
+
+## Environment variables
+
+JavaScript is **not** an bash.
+
+```ts
+const HOME = exec("echo $HOME") // does not work
+```
+
+`exec` and `execAsync` runs the passed program as is, its **not** run in a
+shell environment, so the above example just passes `$HOME` as a string literal
+to the `echo` program.
+
+:::danger Please don't do this
+You could pass it to bash, but that is a horrible approach.
+
+```ts
+const HOME = exec("bash -c 'echo $HOME'")
+```
+
+:::
+
+You can read environment variables with [GLib.getenv](https://gjs-docs.gnome.org/glib20~2.0/glib.getenv).
+
+```ts
+import GLib from "gi://GLib"
+
+const HOME = GLib.getenv("HOME")
+```
+
+## Custom SVG symbolic icons
+
+Put the svgs in a directory, named `<icon-name>-symbolic.svg`
+and use `App.add_icons` or `icons` parameter in `App.start`
+
+:::code-group
+
+```ts [app.ts]
+App.start({
+    icons: `${SRC}/icons`,
+    main() {
+        Widget.Icon({
+            icon: "custom-symbolic", // custom-symbolic.svg
+            css: "color: green;", // can be colored, like other named icons
+        })
+    },
+})
+```
+
+:::
+
+:::info
+If there is a name clash with an icon from your current icon pack
+the icon pack will take precedence
+:::
+
+## Logging
+
+The `console` API in gjs uses glib logging functions.
+If you just want to print some text as is to stdout
+use the globally available `print` function or `printerr` for stderr.
+
+```ts
+print("print this line to stdout")
+printerr("print this line to stderr")
+```
+
+## Populate the global scope with frequently accessed variables
+
+It might be annoying to always import Gtk only for `Gtk.Align` enums.
+
+:::code-group
+
+```ts [globals.ts]
+import Gtk from "gi://Gtk"
+
+declare global {
+    const START: number
+    const CENTER: number
+    const END: number
+    const FILL: number
+}
+
+Object.assign(globalThis, {
+    START: Gtk.Align.START,
+    CENTER: Gtk.Align.CENTER,
+    END: Gtk.Align.END,
+    FILL: Gtk.Align.FILL,
+})
+```
+
+:::
+
+:::code-group
+
+```tsx [Bar.tsx]
+export default function Bar() {
+    return <window>
+        <box halign={START} />
+    </window>
+}
+```
+
+:::
+
+:::code-group
+
+```ts [app.ts]
+import "./globals"
+import Bar from "./Bar"
+
+App.start({
+    main: Bar
+})
+```
+
+:::
+
+:::info
+It is considered bad practice to populate the global scope, but its your code, not a public library.
+:::
+
+## Auto create Window for each Monitor
+
+To have Window widgets appear on a monitor when its plugged in, listen to `App.monitor_added`.
+
+:::code-group
+
+```tsx [Bar.tsx]
+export default function Bar(gdkmonitor: Gdk.Monitor) {
+    return <window gdkmonitor={gdkmonitor} />
+}
+```
+
+:::
+
+:::code-group
+
+```ts [app.ts]
+import { Gdk, Gtk } from "astal"
+import Bar from "./Bar"
+
+function main() {
+    const bars = new Map<Gdk.Monitor, Gtk.Widget>()
+
+    // initialize
+    for (const gdkmonitor of App.get_monitors()) {
+        bars.set(gdkmonitor, Bar(gdkmonitor))
+    }
+
+    App.connect("monitor-added", (_, gdkmonitor) => {
+        bars.set(gdkmonitor, Bar(gdkmonitor))
+    })
+
+    App.connect("monitor-removed", (_, gdkmonitor) => {
+        bars.get(gdkmonitor)?.destroy()
+        bars.delete(gdkmonitor)
+    })
+}
+
+App.start({ main })
+```
+
+:::
+
+## Error: Can't convert non-null pointer to JS value
+
+These happen when accessing list type properties. Gjs fails to correctly bind
+`List` and other array like types of Vala as a property.
+
+```ts
+import Notifd from "gi://AstalNotifd"
+const notifd = Notifd.get_default()
+
+notifd.notifications // ❌ // [!code error]
+
+notifd.get_notifications() // ✅
+```
+
+## How to create regular floating windows
+
+Use `Gtk.Window` with [Widget.astalify](/guide/ags/widget#how-to-use-non-builtin-gtk-widgets).
+
+By default `Gtk.Window` is destroyed on close. To prevent this add a handler for `delete-event`.
+
+```tsx {4-7}
+const RegularWindow = Widget.astalify(Gtk.Window)
+
+return <RegularWindow
+    onDeleteEvent={(self) => {
+        self.hide()
+        return true
+    }}
+>
+    {child}
+</RegularWindow>
+```
+
+## Is there a way to limit the width/height of a widget?
+
+Unfortunately not. You can set a minimum size with `min-width` and `min-heigth` css attributes,
+but you can not set max size.
+
+## Custom widgets with bindable properties
+
+In function components you can wrap any primitive to handle both
+binding and value cases as one.
+
+```tsx
+function MyWidget(props: { prop: string | Binding<string> }) {
+    const prop = props.prop instanceof Binding
+        ? props.prop
+        : bind({ get: () => props.prop, subscribe: () => () => {} })
+
+    function setup(self: Widget.Box) {
+        self.hook(prop, () => {
+            const value = prop.get()
+            // handler
+        })
+    }
+
+    return <box setup={setup}>
+    </box>
+}
+```
+
+You can pass the prop the super constructor in subclasses
+
+```tsx
+@register()
+class MyWidget extends Widget.Box {
+    @property(String)
+    set prop(v: string) {
+        // handler
+    }
+
+    constructor(props: { prop: string | Binding<string> }) {
+        super(props)
+    }
+}
+```
diff --git a/docs/guide/typescript/first-widgets.md b/docs/guide/typescript/first-widgets.md
new file mode 100644
index 0000000..3664bfa
--- /dev/null
+++ b/docs/guide/typescript/first-widgets.md
@@ -0,0 +1,412 @@
+# First Widgets
+
+## Getting Started
+
+Start by initializing a project
+
+```sh
+ags --init
+```
+
+then run `ags` in the terminal
+
+```sh
+ags
+```
+
+:::details Usage without AGS
+🚧 Not yet documented. 🚧
+:::
+
+That's it! You have now a custom written bar using Gtk.
+
+:::tip
+AGS will transpile every `.ts`, `.jsx` and `.tsx` files into regular JavaScript, then
+it will bundle everything into a single JavaScript file which then GJS can execute.
+:::
+
+The AGS init command will generate the following files
+
+```txt
+.
+├── @girs/              # generated types
+├── widget/
+│   └── Bar.tsx
+├── app.ts              # entry proint
+├── env.d.ts            # additional types
+├── style.css
+└── tsconfig.json       # needed by LSPs
+```
+
+## Root of every shell component: Window
+
+Astal apps are composed of widgets. A widget is a piece of UI that has its own logic and style.
+A widget can be as small as a button or an entire bar.
+The top level widget is always a [Window](https://aylur.github.io/libastal/class.Window.html) which will hold all widgets.
+
+::: code-group
+
+```tsx [widget/Bar.tsx]
+function Bar(monitor = 0) {
+    return <window className="Bar" monitor={monitor}>
+        <box>Content of the widget</box>
+    </window>
+}
+```
+
+:::
+
+::: code-group
+
+```ts [app.ts]
+import Bar from "./widget/Bar"
+
+App.start({
+    main() {
+        Bar(0)
+        Bar(1) // instantiate for each monitor
+    },
+})
+```
+
+:::
+
+## Creating and nesting widgets
+
+Widgets are JavaScript functions which return Gtk widgets,
+either by using JSX or using a widget constructor.
+
+:::code-group
+
+```tsx [MyButton.tsx]
+function MyButton(): JSX.Element {
+    return <button onClicked="echo hello">
+        <label label="Click me!" />
+    </button>
+}
+```
+
+```ts [MyButton.ts]
+import { Widget } from "astal/gtk3"
+
+function MyButton(): Widget.Button {
+    return new Widget.Button(
+        { onClicked: "echo hello" },
+        new Widget.Label({ label: "Click me!" }),
+    )
+}
+```
+
+:::
+
+:::info
+The only difference between the two is the return type.
+Using markup the return type is always `Gtk.Widget` (globally available as `JSX.Element`),
+while using constructors the return type is the actual type of the widget.
+It is rare to need the actual return type, so most if not all of the time, you can use markup.
+:::
+
+Now that you have declared `MyButton`, you can nest it into another component.
+
+```tsx
+function MyBar() {
+    return <window>
+        <box>
+            Click The button
+            <MyButton />
+        </box>
+    </window>
+}
+```
+
+Notice that widgets you defined start with a capital letter `<MyButton />`.
+Lowercase tags are builtin widgets, while capital letter is for custom widgets.
+
+## Displaying Data
+
+JSX lets you put markup into JavaScript.
+Curly braces let you “escape back” into JavaScript so that you can embed some variable
+from your code and display it.
+
+```tsx
+function MyWidget() {
+    const label = "hello"
+
+    return <button>{label}</button>
+}
+```
+
+You can also pass JavaScript to markup attributes
+
+```tsx
+function MyWidget() {
+    const label = "hello"
+
+    return <button label={label} />
+}
+```
+
+## Conditional Rendering
+
+You can use the same techniques as you use when writing regular JavaScript code.
+For example, you can use an if statement to conditionally include JSX:
+
+```tsx
+function MyWidget() {
+    let content
+
+    if (condition) {
+        content = <True />
+    } else {
+        content = <False />
+    }
+
+    return <box>{content}</box>
+}
+```
+
+You can also inline a [conditional `?`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_operator) (ternary) expression.
+
+```tsx
+function MyWidget() {
+    return <box>{condition ? <True /> : <False />}</box>
+}
+```
+
+When you don’t need the `else` branch, you can also use a shorter [logical && syntax](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_AND#short-circuit_evaluation):
+
+```tsx
+function MyWidget() {
+    return <box>{condition && <True />}</box>
+}
+```
+
+:::info
+As you can guess from the above snippet, [falsy](https://developer.mozilla.org/en-US/docs/Glossary/Falsy) values are not rendered.
+:::
+
+## Rendering lists
+
+You can use [`for` loops](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for) or [array `map()` function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map).
+
+```tsx
+function MyWidget() {
+    const labels = [
+        "label1"
+        "label2"
+        "label3"
+    ]
+
+    return <box>
+        {labels.map(label => (
+            <label label={label} />
+        ))}
+    </box>
+}
+```
+
+## Widget signal handlers
+
+You can respond to events by declaring event handler functions inside your widget:
+
+```tsx
+function MyButton() {
+    function onClicked(self: Widget.Button, ...args) {
+        console.log(self, "was clicked")
+    }
+
+    return <button onClicked={onClicked} />
+}
+```
+
+The handler can also be a string, which will get executed in a subprocess asynchronously.
+
+```tsx
+function MyButton() {
+    return <button onClicked="echo hello" />
+}
+```
+
+:::info
+Attributes prefixed with `on` will connect to a `signal` of the widget.
+Their types are not generated, but written by hand, which means not all of them are typed.
+Refer to the Gtk and Astal docs to have a full list of them.
+:::
+
+## How properties are passed
+
+Using JSX, a custom widget will always have a single object as its parameter.
+
+```ts
+type Props = {
+    myprop: string
+    child?: JSX.Element // when only one child is passed
+    children?: Array<JSX.Element> // when multiple children are passed
+}
+
+function MyWidget({ myprop, child, children }: Props) {
+    //
+}
+```
+
+```tsx
+// child prop of MyWidget is the box
+return <MyWidget myprop="hello">
+    <box />
+</MyWidget>
+```
+
+```tsx
+// children prop of MyWidget is [box, box, box]
+return <MyWidget myprop="hello">
+    <box />
+    <box />
+    <box />
+</MyWidget>
+```
+
+## State management
+
+The state of widgets are handled with Bindings. A [Binding](./binding) lets you
+connect the state of an [object](./binding#subscribable-and-connectable-interface)
+to a widget so it re-renders when that state changes.
+
+Use the `bind` function to create a `Binding` object from a `Variable` or
+a regular `GObject` and one of its properties.
+
+Here is an example of a Counter widget that uses a `Variable` as its state:
+
+```tsx
+import { Variable, bind } from "astal"
+
+function Counter() {
+    const count = Variable(0)
+
+    function increment() {
+        count.set(count.get() + 1)
+    }
+
+    return <box>
+        <label label={bind(count).as(num => num.toString())} />
+        <button onClicked={increment}>
+            Click to increment
+        <button>
+    </box>
+}
+```
+
+:::info
+Bindings have an `.as()` method which lets you transform the assigned value.
+In the case of a Label, its label property expects a string, so it needs to be
+turned to a string first.
+:::
+
+:::tip
+`Variables` have a shorthand for `bind(variable).as(transform)`
+
+```tsx
+const v = Variable(0)
+const transform = (v) => v.toString()
+
+return <box>
+    {/* these two are equivalent */}
+    <label label={bind(v).as(transform)} />
+    <label label={v(transform)} />
+</box>
+```
+
+:::
+
+Here is an example of a battery percent label that binds the `percentage`
+property of the Battery object from the [Battery Library](/guide/libraries/battery):
+
+```tsx
+import Battery from "gi://AstalBattery"
+import { bind } from "astal"
+
+function BatteryPercentage() {
+    const bat = Battery.get_default()
+
+    return <label label={bind(bat, "percentage").as((p) => p * 100 + " %")} />
+}
+```
+
+## Dynamic children
+
+You can also use a `Binding` for `child` and `children` properties.
+
+```tsx
+const child = Variable(<box />)
+
+return <box>{child}</box>
+```
+
+```tsx
+const num = Variable(3)
+const range = (n) => [...Array(n).keys()]
+
+return <box>
+    {num(n => range(n).map(i => (
+        <button>
+            {i.toString()}
+        <button/>
+    )))}
+<box>
+```
+
+:::tip
+Binding children of widgets will implicitly call `.destroy()` on widgets
+that would be left without a parent. You can opt out of this behavior
+by setting `noImplicityDestroy` property on the container widget.
+:::
+
+:::info
+The above example destroys and recreates every widget in the list **every time**
+the value of the `Variable` changes. There might be cases where you would
+want to [handle child creation and deletion](/guide/ags/faq#avoiding-unnecessary-re-rendering)
+yourself, because you don't want to lose the
+inner state of widgets that does not need to be recreated. In this case
+you can create a [custom reactive structure](./binding#example-custom-subscribable)
+:::
+
+When there is at least one `Binding` passed as a child, the `children`
+parameter will always be a flattened `Binding<Array<JSX.Element>>`.
+When there is a single `Binding` passed as a child, the `child` parameter will
+be a `Binding<JSX.Element>` or a flattened `Binding<Array<JSX.Element>>`.
+
+```tsx
+import { type Binding } from "astal"
+
+function MyContainer({ children }: {
+    children?: Binding<Array<JSX.Element>>
+}) {
+    // children is a Binding over an Array of widgets
+}
+
+return <MyContainer>
+    <box />
+    {num(n => range(n).map(i => (
+        <button>
+            {i.toString()}
+        <button/>
+    )))}
+    [
+        [
+            <button />
+        ]
+        <button />
+    ]
+</MyContainer>
+```
+
+:::info
+You can pass the followings as children:
+
+- widgets
+- deeply nested arrays of widgets
+- bindings of widgets,
+- bindings of deeply nested arrays of widgets
+
+[falsy](https://developer.mozilla.org/en-US/docs/Glossary/Falsy) values are not rendered and anything not from this list
+will be coerced into a string and rendered as a label
+:::
diff --git a/docs/guide/typescript/gobject.md b/docs/guide/typescript/gobject.md
new file mode 100644
index 0000000..f7f001d
--- /dev/null
+++ b/docs/guide/typescript/gobject.md
@@ -0,0 +1,165 @@
+# Subclassing GObject.Object
+
+Astal provides decorator functions that make it easy to subclass gobjects.
+
+## Example Usage
+
+```ts
+import GObject, { register, property } from "astal/gobject"
+
+@register()
+class MyObj extends GObject.Object {
+    @property(String)
+    declare myProp: string
+
+    @signal(String, Number)
+    declare mySignal: (a: string, b: number) => void
+}
+```
+
+## Property decorator
+
+```ts
+type PropertyDeclaration =
+    | GObject.ParamSpec
+    | { $gtype: GObject.GType }
+
+function property(declaration: PropertyDeclaration)
+```
+
+The `property` decorator can take any class that has a registered GType.
+This includes the globally available `String`, `Number`, `Boolean` and `Object`
+javascript constructors. They are mapped to their relative `GObject.ParamSpec`.
+
+The property decorator can be applied in the following ways:
+
+1. On a property declaration
+
+```ts {3,4}
+@register()
+class MyObj extends GObject.Object {
+    @property(String)
+    declare myProp: string
+}
+```
+
+This will create a getter and setter for the property and will also
+emit the notify signal when the value is set to a new value.
+
+:::info
+The `declare` keyword is required so that the property declaration
+is not transpiled into JavaScript, otherwise the initial value of the
+property would be `undefined`.
+:::
+
+:::warning
+The value is checked by reference, this is important if your
+property is an object type.
+
+```ts
+const dict = obj.prop
+dict["key"] = 0
+obj.prop = dict // This will not emit notify::prop // [!code error]
+obj.prop = { ...dict } // This will emit notify::prop
+```
+
+:::
+
+If you want to set a custom default value, do so in the constructor of your class.
+
+```ts {7}
+@register()
+class MyObj extends GObject.Object {
+    @property(String)
+    declare myProp: string
+
+    constructor() {
+        super({ myProp: "default-value" })
+    }
+}
+```
+
+2. On a getter
+
+```ts {3,4}
+@register()
+class MyObj extends GObject.Object {
+    @property(String)
+    get myProp () {
+        return "value"
+    }
+}
+```
+
+This will create a read-only property.
+
+3. On a getter and setter
+
+```ts {5,6,10}
+@register()
+class MyObj extends GObject.Object {
+    declare private _prop: string
+
+    @property(String)
+    get myProp () {
+        return "value"
+    }
+
+    set myProp (v: string) {
+        if (v !== this._prop) {
+            this._prop = v
+            this.notify("my-prop")
+        }
+    }
+}
+```
+
+This will create a read-write property.
+
+:::info
+When defining getter/setters for the property, notify signal emission has to be done explicitly.
+:::
+
+## Signal decorator
+
+```ts
+function signal(...params: Array<{ $gtype: GObject.GType })
+
+function signal(declaration?: SignalDeclaration) // Object you would pass to GObject.registerClass
+```
+
+You can apply the signal decorator to either a property declaration or a method.
+
+```ts {3,4,6,7}
+@register()
+class MyObj extends GObject.Object {
+    @signal(String, String)
+    declare mySig: (a: String, b: String) => void
+
+    @signal(String, String)
+    mySig(a: string, b: string) {
+        // default signal handler
+    }
+}
+```
+
+You can emit the signal by calling the signal method or using `emit`.
+
+```ts
+const obj = new MyObj()
+obj.connect("my-sig", (obj, a: string, b: string) => {})
+
+obj.mySig("a", "b")
+obj.emit("my-sig", "a", "b")
+```
+
+## Register decorator
+
+Every GObject subclass has to be registered. You can pass the same options
+to this decorator as you would to `GObject.registerClass`
+
+```ts
+@register({ GTypeName: "MyObj" })
+class MyObj extends GObject.Object {
+}
+```
diff --git a/docs/guide/typescript/installation.md b/docs/guide/typescript/installation.md
new file mode 100644
index 0000000..4c31b6e
--- /dev/null
+++ b/docs/guide/typescript/installation.md
@@ -0,0 +1,89 @@
+# Installation
+
+It is recommended to use [AGS](https://github.com/aylur/ags)
+to scaffold and run projects in TypeScript.
+
+It lets you
+
+- generate TypeScript types using [ts-for-gir](https://github.com/gjsify/ts-for-gir)
+- generate a tsconfig which is used by LSPs
+- bundle your TypeScript and JavaScript code using [esbuild](https://esbuild.github.io/).
+
+::: details Trivia
+AGS is the predecessor of Astal, which was written purely in TypeScript and so only supported
+JavaScript/TypeScript. Now it serves as a scaffolding tool for Astal+TypeScript+JSX projects.
+:::
+
+## Nix
+
+maintainer: [@Aylur](https://github.com/Aylur)
+
+Read more about it on the [nix page](../getting-started/nix#ags)
+
+You can try without installing.
+
+<!--TODO: remove v2 after merge-->
+```sh
+nix run github:aylur/ags/v2#agsFull -- --help
+```
+
+## From source
+
+1. [Install Astal](../getting-started/installation.md) if you have not already
+
+2. Install the Astal GJS package
+
+```sh
+git clone https://github.com/aylur/astal
+cd lang/gjs
+meson setup --prefix /usr build
+meson install -C build
+```
+
+:::tip
+You might be wondering why it is recommended to install a JavaScript
+package on the system instead of installing it as a node module.
+It is solely to keep it in **sync** with the core `astal-sh` and `astal3`/`astal4` package.
+:::
+
+3. Install the following dependencies
+
+:::code-group
+
+```sh [<i class="devicon-archlinux-plain"></i> Arch]
+sudo pacman -Syu go npm gjs
+```
+
+```sh [<i class="devicon-fedora-plain"></i> Fedora]
+sudo dnf install golang npm gjs
+```
+
+```sh [<i class="devicon-ubuntu-plain"></i> Ubuntu]
+sudo apt install golang-go npm gjs
+```
+
+:::
+
+3. Clone the repo and Install
+
+<!--TODO: remove v2 after merge-->
+```sh
+git clone https://github.com/aylur/ags.git
+git checkout v2 # https://github.com/Aylur/ags/pull/504
+cd ags/src
+go install
+```
+
+:::tip
+`go install` installs the `ags` binary to `$GOPATH/bin` so make sure its in your `$PATH`.
+You can move it to another directory if you like. For example
+
+```sh
+sudo mv $GOPATH/bin/ags /usr/bin/ags
+```
+
+:::
+
+## Without AGS
+
+🚧 Setting up a dev environment without AGS is not yet documented. 🚧
diff --git a/docs/guide/typescript/theming.md b/docs/guide/typescript/theming.md
new file mode 100644
index 0000000..10a3981
--- /dev/null
+++ b/docs/guide/typescript/theming.md
@@ -0,0 +1,179 @@
+# Theming
+
+Since the widget toolkit is **GTK3** theming is done with **CSS**.
+
+- [CSS tutorial](https://www.w3schools.com/css/)
+- [GTK CSS Overview wiki](https://docs.gtk.org/gtk3/css-overview.html)
+- [GTK CSS Properties Overview wiki](https://docs.gtk.org/gtk3/css-properties.html)
+
+:::warning GTK is not the web
+While most features are implemented in GTK,
+you can't assume anything that works on the web will work with GTK.
+Refer to the [GTK docs](https://docs.gtk.org/gtk3/css-overview.html)
+to see what is available.
+:::
+
+So far every widget you made used your default GTK3 theme.
+To make them more custom, you can apply stylesheets to them.
+
+## From file at startup
+
+You can pass a path to a file or css as a string in `App.start`
+
+:::code-group
+
+```ts [app.ts]
+import style from "inline:./style.css"
+
+const inlineCssInCode = `
+window {
+    background-color: transparent;
+}
+`
+
+App.start({
+    css: "./style.css",
+    css: style,
+    css: `${SRC}/style.css'`,
+    css: inlineCss,
+})
+```
+
+:::
+
+:::info
+When using AGS the global `SRC` will point to the directory `app.ts` is in.
+AGS will set the current working directory to `--config`, so `./style.css` also works.
+If you are not using AGS you should inline import CSS instead.
+:::
+
+## Css Property on Widgets
+
+```ts
+Widget.Label({
+    css: "color: blue; padding: 1em;",
+    label: "hello",
+})
+```
+
+:::info
+The `css` property of a widget will not cascade to its children.
+:::
+
+## Apply Stylesheets at Runtime
+
+You can apply additional styles at runtime.
+
+```ts
+App.apply_css("/path/to/file.css")
+```
+
+```ts
+App.apply_css(`
+window {
+    background-color: transparent;
+}
+`)
+```
+
+```ts
+App.reset_css() // reset if need
+```
+
+:::warning
+`App.apply_css` will apply on top of other stylesheets applied before.
+You can reset stylesheets with `App.resetCss`
+:::
+
+## Inspector
+
+If you are not sure about the widget hierarchy or any CSS selector,
+you can use the [GTK inspector](https://wiki.gnome.org/Projects/GTK/Inspector)
+
+::: code-group
+
+```sh [astal]
+# to bring up the inspector run
+astal --inspector
+```
+
+```sh [ags]
+# to bring up the inspector run
+ags --inspector
+```
+
+:::
+
+## Using SCSS
+
+Gtk's CSS only supports a subset of what the web offers.
+Most notably nested selectors are unsupported by Gtk, but this can be
+workaround by using preprocessors like [SCSS](https://sass-lang.com/).
+
+:::code-group
+
+```sh [<i class="devicon-archlinux-plain"></i> Arch]
+sudo pacman -Syu dart-sass
+```
+
+```sh [<i class="devicon-fedora-plain"></i> Fedora]
+npm install -g sass # not packaged on Fedora
+```
+
+```sh [<i class="devicon-ubuntu-plain"></i> Ubuntu]
+npm install -g sass # not packaged on Ubuntu
+```
+
+:::
+
+Importing `scss` files will simply return transpiled css.
+
+:::code-group
+
+```ts [app.ts]
+import style from "./style.scss"
+
+App.start({
+    css: style,
+    main() {},
+})
+```
+
+:::
+
+:::details Without AGS
+AGS uses a plugin to transpile scss files before importing them.
+If you are not using AGS, you can use a plugin for your chosen bundler.
+:::
+
+:::tip
+If you for example want to set scss varibles from JS,
+You can inline import, compose, and transpile yourself.
+
+```ts [app.ts]
+import style1 from "inline:./style1.scss"
+import style2 from "inline:./style2.scss"
+
+const tmpscss = "/tmp/style.scss"
+const target = "/tmp/style.css"
+
+writeFile(tmpscss, `
+  $var1: red;
+  $var1: blue;
+  ${style1}
+  ${style1}
+`)
+
+exec(`sass ${tmpscss} ${target}`)
+
+App.start({
+    css: target,
+})
+
+```
+
+:::
+
+:::info
+If you want other preprocessors support builtin open an Issue.
+:::
diff --git a/docs/guide/typescript/utilities.md b/docs/guide/typescript/utilities.md
new file mode 100644
index 0000000..9bc56b2
--- /dev/null
+++ b/docs/guide/typescript/utilities.md
@@ -0,0 +1,168 @@
+# Utilities
+
+## File functions
+
+```ts
+import {
+    readFile,
+    readFileAsync,
+    writeFile,
+    writeFileAsync,
+    monitorFile,
+} from "astal"
+```
+
+### Reading files
+
+```ts
+function readFile(path: string): string
+function readFileAsync(path: string): Promise<string>
+```
+
+### Writing files
+
+```ts
+function writeFile(path: string, content: string): void
+function writeFileAsync(path: string, content: string): Promise<void>
+```
+
+### Monitoring files
+
+```ts
+function monitorFile(
+    path: string,
+    callback: (file: string, event: Gio.FileMonitorEvent) => void,
+): Gio.FileMonitor
+```
+
+## Timeouts and Intervals
+
+```ts
+import { interval, timeout, idle } from "astal"
+```
+
+You can use javascript native `setTimeout` or `setInterval`
+they return a [GLib.Source](https://docs.gtk.org/glib/struct.Source.html) instance.
+Alternatively you can use these functions provided by Astal,
+which return an [Astal.Time](https://aylur.github.io/libastal/class.Time.html) instance.
+
+`Astal.Time` has a `now` signal and a `cancelled` signal.
+
+### Interval
+
+Will immediately execute the function and every `interval` millisecond.
+
+```ts
+function interval(interval: number, callback?: () => void): Astal.Time
+```
+
+### Timeout
+
+Will execute the `callback` after `timeout` millisecond.
+
+```ts
+function timeout(timeout: number, callback?: () => void): Astal.Time
+```
+
+### Idle
+
+Executes `callback` whenever there are no higher priority events pending.
+
+```ts
+function idle(callback?: () => void): Astal.Time
+```
+
+Example:
+
+```ts
+const timer = interval(1000, () => {
+    console.log("optional callback")
+})
+
+timer.connect("now", () => {
+    console.log("tick")
+})
+
+timer.connect("cancelled", () => {
+    console.log("cancelled")
+})
+
+timer.cancel()
+```
+
+## Process functions
+
+```ts
+import { subprocess, exec, execAsync } from "astal"
+```
+
+### Subprocess
+
+You can start a subprocess and run callback functions whenever it outputs to
+stdout or stderr. [Astal.Process](https://aylur.github.io/libastal/class.Process.html) has a `stdout` and `stderr` signal.
+
+```ts
+function subprocess(args: {
+    cmd: string | string[]
+    out?: (stdout: string) => void
+    err?: (stderr: string) => void
+}): Astal.Process
+
+function subprocess(
+    cmd: string | string[],
+    onOut?: (stdout: string) => void,
+    onErr?: (stderr: string) => void,
+): Astal.Process
+```
+
+Example:
+
+```ts
+const proc = subprocess(
+    "some-command",
+    (out) => console.log(out), // optional
+    (err) => console.error(out), // optional
+)
+
+// or with signals
+const proc = subprocess("some-command")
+proc.connect("stdout", (out) => console.log(out))
+proc.connect("stderr", (err) => console.error(err))
+```
+
+### Executing external commands and scripts
+
+```ts
+function exec(cmd: string | string[]): string
+function execAsync(cmd: string | string[]): Promise<string>
+```
+
+Example:
+
+```ts
+try {
+    const out = exec("/path/to/script")
+    console.log(out)
+} catch (err) {
+    console.error(err)
+}
+
+execAsync(["bash", "-c", "/path/to/script.sh"])
+    .then((out) => console.log(out))
+    .catch((err) => console.error(err))
+```
+
+:::warning
+`subprocess`, `exec`, and `execAsync` executes the passed executable as is.
+They are **not** executed in a shell environment,
+they do **not** expand ENV variables like `$HOME`,
+and they do **not** handle logical operators like `&&` and `||`.
+
+If you want bash, run them with bash.
+
+```ts
+exec(["bash", "-c", "command $VAR && command"])
+exec("bash -c 'command $VAR' && command")
+```
+
+:::
diff --git a/docs/guide/typescript/variable.md b/docs/guide/typescript/variable.md
new file mode 100644
index 0000000..4207f61
--- /dev/null
+++ b/docs/guide/typescript/variable.md
@@ -0,0 +1,153 @@
+# Variable
+
+```js
+import { Variable } from "astal"
+```
+
+Variable is just a simple object which holds a single value.
+It also has some shortcuts for hooking up subprocesses, intervals and other gobjects.
+
+:::info
+The `Variable` object imported from the `"astal"` package is **not** [Astal.Variable](https://aylur.github.io/libastal/class.Variable.html).
+:::
+
+## Example Usage
+
+```typescript
+const myvar = Variable("initial-value")
+
+// whenever its value changes, callback will be executed
+myvar.subscribe((value: string) => {
+    console.log(value)
+})
+
+// settings its value
+myvar.set("new value")
+
+// getting its value
+const value = myvar.get()
+
+// binding them to widgets
+Widget.Label({
+    label: bind(myvar).as((value) => `transformed ${value}`),
+    label: myvar((value) => `transformed ${value}`), // shorthand for the above
+})
+```
+
+:::warning
+Make sure to make the transform functions passed to `.as()` are pure.
+The `.get()` function can be called anytime by `astal` especially when `deriving`,
+so make sure there are no sideeffects.
+:::
+
+## Variable Composition
+
+Using `Variable.derive` any `Subscribable` object can be composed.
+
+```typescript
+const v1: Variable<number> = Variable(1)
+const v2: Binding<number> = bind(obj, "prop")
+const v3: Subscribable<number> = {
+    get: () => 3,
+    subscribe: () => () => {},
+}
+
+// first argument is a list of dependencies
+// second argument is a transform function,
+// where the parameters are the values of the dependencies in the order they were passed
+const v4: Variable<number> = Variable.derive(
+    [v1, v2, v3],
+    (v1: number, v2: number, v3: number) => {
+        return v1 * v2 * v3
+    }
+)
+```
+
+:::info
+The types are only for demonstration purposes, you do not have to declare
+the type of a Variable, they will be inferred from their initial value.
+:::
+
+## Subprocess shorthands
+
+Using `.poll` and `.watch` we can start subprocesses and capture their
+output. They can poll and watch at the same time, but they
+can only poll/watch once.
+
+:::warning
+The command parameter is passed to [execAsync](/guide/ags/utilities#executing-external-commands-and-scripts)
+which means they are **not** executed in a shell environment,
+they do **not** expand ENV variables like `$HOME`,
+and they do **not** handle logical operators like `&&` and `||`.
+
+If you want bash, run them with bash.
+
+```js
+Variable("").poll(1000, ["bash", "-c", "command $VAR && command"])
+```
+
+:::
+
+```typescript
+const myVar = Variable(0)
+    .poll(1000, "command", (out: string, prev: number) => parseInt(out))
+    .poll(1000, ["bash", "-c", "command"], (out, prev) => parseInt(out))
+    .poll(1000, (prev) => prev + 1)
+```
+
+```typescript
+const myVar = Variable(0)
+    .watch("command", (out: string, prev: number) => parseInt(out))
+    .watch(["bash", "-c", "command"], (out, prev) => parseInt(out))
+```
+
+You can temporarily stop them and restart them whenever.
+
+```js
+myvar.stopWatch() // this kills the subprocess
+myvar.stopPoll()
+
+myvar.startListen() // launches the subprocess again
+myvar.startPoll()
+
+console.log(myvar.isListening())
+console.log(myvar.isPolling())
+```
+
+## Gobject connection shorthands
+
+Using `.observe` you can connect gobject signals and capture their value.
+
+```typescript
+const myvar = Variable("")
+    .observe(obj1, "signal", () => "")
+    .observe(obj2, "signal", () => "")
+```
+
+## Dispose if no longer needed
+
+This will stop the interval and force exit the subprocess and disconnect gobjects.
+
+```js
+myVar.drop()
+```
+
+:::warning
+Don't forget to drop derived variables or variables with
+either `.poll`, `.watch` or `.observe` when they are defined inside closures.
+
+```tsx
+function MyWidget() {
+    const myvar = Variable().poll()
+    const derived = Variable.derive()
+
+    return <box
+        onDestroy={() => {
+            myvar.drop()
+            derived.drop()
+        }}
+    />
+}
+```
+
+:::
diff --git a/docs/guide/typescript/widget.md b/docs/guide/typescript/widget.md
new file mode 100644
index 0000000..03ba9ea
--- /dev/null
+++ b/docs/guide/typescript/widget.md
@@ -0,0 +1,214 @@
+# Widget
+
+## Gtk3
+
+### Additional widget properties
+
+These are properties that Astal additionally adds to Gtk.Widgets
+
+- className: `string` - List of class CSS selectors separated by white space.
+- css: `string` - Inline CSS. e.g `label { color: white; }`. If no selector is specified `*` will be assumed. e.g `color: white;` will be inferred as `* { color: white; }`.
+- cursor: `string` - Cursor style when hovering over widgets that have hover states, e.g it won't work on labels. [list of valid values](https://docs.gtk.org/gdk3/ctor.Cursor.new_from_name.html).
+- clickThrough: `boolean` - Lets click events through.
+
+To have a full list of available properties, reference the documentation of the widget.
+
+- [Astal3 widgets](https://aylur.github.io/libastal/astal3/index.html#classes)
+- [Gtk widgets](https://docs.gtk.org/gtk3/#classes)
+
+### Additional widget methods
+
+#### setup
+
+`setup` is a convenience prop to remove the need to predefine widgets
+before returning them in cases where a reference is needed.
+
+without `setup`
+
+```tsx
+function MyWidget() {
+    const button = Widget.Button()
+    // setup button
+    return button
+}
+```
+
+using `setup`
+
+```tsx
+function MyWidget() {
+    function setup(button: Widget.Button) {
+        // setup button
+    }
+
+    return <buttons setup={setup} />
+}
+```
+
+#### hook
+
+Shorthand for connection and disconnecting to [Subscribable and Connectable](./binding#subscribable-and-connectable-interface) objects.
+
+without `hook`
+
+```tsx
+function MyWidget() {
+    const id = gobject.connect("signal", callback)
+    const unsub = variable.subscribe(callback)
+
+    return <box
+        onDestroy={() => {
+            gobject.disconnect(id)
+            unsub()
+        }}
+    />
+}
+```
+
+with `hook`
+
+```tsx
+function MyWidget() {
+    return <box
+        setup={(self) => {
+            self.hook(gobject, "signal", callback)
+            self.hook(variable, callback)
+        }}
+    />
+}
+```
+
+#### toggleClassName
+
+Toggle classNames based on a condition
+
+```tsx
+function MyWidget() {
+    return <box
+        setup={(self) => {
+            self.toggleClassName("classname", someCondition)
+        }}
+    />
+}
+```
+
+### How to use non builtin Gtk widgets
+
+Using the `Widget.astalify` mixin you can subclass widgets
+to behave like builtin widgets.
+The `astalify` mixin will apply the following:
+
+- set `visible` to true by default (Gtk3 widgets are invisible by default)
+- make gobject properties accept and consume `Binding` objects
+- add properties and methods listed above
+- sets up signal handlers that are passed as props prefixed with `on`
+
+```tsx
+import { Widget, Gtk, GObject, Gdk } from "astal/gtk3"
+
+// subclass, register, define constructor props
+class ColorButton extends Widget.astalify(Gtk.ColorButton) {
+    static { GObject.registerClass(this) }
+
+    constructor(props: Widget.ConstructProps<
+        ColorButton,
+        Gtk.ColorButton.ConstructorProps,
+        { onColorSet: [] } // signals of Gtk.ColorButton have to be manually typed
+    >) {
+        super(props as any)
+    }
+}
+
+function MyWidget() {
+    function setup(button: ColorButton) {
+
+    }
+
+    return <ColorButton
+        setup={setup}
+        useAlpha
+        rgba={new Gdk.RGBA({
+            red: 1,
+            green: 0,
+            blue: 0,
+            alpha: 0.5,
+        })}
+        onColorSet={(self) => {
+            console.log(self.rgba)
+        }}
+    />
+}
+```
+
+:::info
+Signal properties have to be annotated manually for TypeScript.
+You can reference [Gtk3](https://gjs-docs.gnome.org/gtk30~3.0/)
+and [Astal](https://aylur.github.io/libastal/index.html#classes) for available signals.
+:::
+
+### TypeScript
+
+Type of widgets are available through `Widget`.
+Here is an example Widget that takes in and handles a possibly `Binding` prop.
+
+```tsx
+import { Binding, Variable, Widget } from "astal"
+
+export interface ToggleButtonProps extends Widget.ButtonProps {
+    onToggled?: (self: Widget.Button, on: boolean) => void
+    state?: Binding<boolean> | boolean
+    child?: JSX.Element
+}
+
+export default function ToggleButton(btnprops: ToggleButtonProps) {
+    const { state = false, onToggled, setup, child, ...props } = btnprops
+    const innerState = Variable(state instanceof Binding ? state.get() : state)
+
+    return <button
+        {...props}
+        setup={self => {
+            setup?.(self)
+
+            self.toggleClassName("active", innerState.get())
+            self.hook(innerState, () => self.toggleClassName("active", innerState.get()))
+
+            if (state instanceof Binding) {
+                self.hook(state, () => innerState.set(state.get()))
+            }
+        }}
+        onClicked={self => {
+            onToggled?.(self, !innerState.get())
+        }}
+    >
+        {child}
+    </button>
+}
+```
+
+### Builtin Widgets
+
+You can check the [source code](https://github.com/aylur/astal/blob/main/lang/gjs/src/gtk3/index.ts) to have a full list of builtin widgets.
+
+These widgets are available by default in JSX.
+
+- box: [Astal.Box](https://aylur.github.io/libastal/class.Box.html)
+- button: [Astal.Button](https://aylur.github.io/libastal/class.Button.html)
+- centerbox: [Astal.CenterBox](https://aylur.github.io/libastal/class.CenterBox.html)
+- circularprogress: [Astal.CircularProgress](https://aylur.github.io/libastal/class.CircularProgress.html)
+- drawingarea: [Gtk.DrawingArea](https://docs.gtk.org/gtk3/class.DrawingArea.html)
+- entry: [Gtk.Entry](https://docs.gtk.org/gtk3/class.Entry.html)
+- eventbox: [Astal.EventBox](https://aylur.github.io/libastal/class.EventBox.html)
+- icon: [Astal.Icon](https://aylur.github.io/libastal/class.Icon.html)
+- label: [Astal.Label](https://aylur.github.io/libastal/class.Label.html)
+- levelbar: [Astal.LevelBar](https://aylur.github.io/libastal/class.LevelBar.html)
+- overlay: [Astal.Overlay](https://aylur.github.io/libastal/class.Overlay.html)
+- revealer: [Gtk.Revealer](https://docs.gtk.org/gtk3/class.Revealer.html)
+- scrollable: [Astal.Scrollable](https://aylur.github.io/libastal/class.Scrollable.html)
+- slider: [Astal.Slider](https://aylur.github.io/libastal/class.Slider.html)
+- stack: [Astal.Stack](https://aylur.github.io/libastal/class.Stack.html)
+- switch: [Gtk.Switch](https://docs.gtk.org/gtk3/class.Switch.html)
+- window: [Astal.Window](https://aylur.github.io/libastal/class.Window.html)
+
+## Gtk4
+
+🚧 Work in Progress 🚧