### Install npm packages

Source: https://kagura.gitbook.io/kagura-nusa-en

Command to install all the necessary Node.js packages and development dependencies listed in package.json.

```bash
npm install

```

--------------------------------

### Install wasm-pack

Source: https://kagura.gitbook.io/kagura-nusa-en

Use this command to install the wasm-pack tool, which is necessary for compiling Rust to WebAssembly.

```bash
cargo install wasm-pack
```

--------------------------------

### Query Documentation Dynamically

Source: https://kagura.gitbook.io/kagura-nusa-en/hello-world

Perform an HTTP GET request with the 'ask' query parameter to get dynamic answers from the documentation. Use this for clarifications or additional context not explicitly on the page.

```http
GET https://kagura.gitbook.io/kagura-nusa-en/hello-world.md?ask=<question>
```

--------------------------------

### package.json scripts

Source: https://kagura.gitbook.io/kagura-nusa-en

Node.js package configuration, defining scripts for starting a development server and building the project with webpack.

```json
{
  "name": "hello-world",
  "version": "0.1.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "./node_modules/.bin/webpack-dev-server",
    "make": "./node_modules/.bin/webpack"
  },
  "devDependencies": {
    "@wasm-tool/wasm-pack-plugin": "^1.6.0",
    "html-webpack-plugin": "^5.3.2",
    "webpack": "^5.70",
    "webpack-cli": "^4.9.0",
    "webpack-dev-server": "^4.3.1"
  }
}

```

--------------------------------

### Render HTML to DOM with BasicDomNode

Source: https://kagura.gitbook.io/kagura-nusa-en/hello-world/creates-a-page

Use `BasicDomNode` to render HTML to the real DOM. It requires a mount point and a function that returns the HTML elements to be rendered. This is typically done within a `wasm_bindgen(start)` function.

```rust
extern crate js_sys;
extern crate kagura;
extern crate nusa;
extern crate wasm_bindgen;
extern crate wasm_bindgen_futures;
extern crate web_sys;

use nusa::html::html_element::Attributes;
use nusa::html::html_element::Events;
use nusa::Html;
use wasm_bindgen::prelude::*;

#[wasm_bindgen(start)]
pub fn main() {
    wasm_bindgen_futures::spawn_local(async {
        kagura::Runtime::run(nusa::dom_node::BasicDomNode::new(entry_point(), |_| {
            vec![Html::h1(
                Attributes::new(),
                Events::new(),
                vec![Html::text("Hello World")],
            )]
        }))
        .await;
    });
}

fn entry_point() -> web_sys::Node {
    web_sys::window()
        .unwrap()
        .document()
        .unwrap()
        .get_element_by_id("app")
        .unwrap()
        .into()
}
```

--------------------------------

### Mount a Component: src/lib.rs

Source: https://kagura.gitbook.io/kagura-nusa-en/single-component/creates-a-component

This snippet demonstrates how to mount the HelloComponent into the DOM. It sets up the necessary external crates and defines the main function to run the Kagura runtime.

```rust
extern crate js_sys;
extern crate kagura;
extern crate nusa;
extern crate wasm_bindgen;
extern crate wasm_bindgen_futures;
extern crate web_sys;

use nusa::html::html_element::Attributes;
use nusa::html::html_element::Events;
use nusa::Html;
use wasm_bindgen::prelude::*;

mod hello_component;
use hello_component::HelloComponent;

#[wasm_bindgen(start)]
pub fn main() {
    wasm_bindgen_futures::spawn_local(kagura::Runtime::run(nusa::dom_node::BasicDomNode::new(
        entry_point(),
        |this| {
            vec![HelloComponent::new(
                this,
                None,
                hello_component::Props {},
                Sub::none(),
                ()
            )]
        },
    )));
}

fn entry_point() -> web_sys::Node {
    web_sys::window()
        .unwrap()
        .document()
        .unwrap()
        .get_element_by_id("app")
        .unwrap()
        .into()
}
```

--------------------------------

### JavaScript entry point

Source: https://kagura.gitbook.io/kagura-nusa-en

Simple JavaScript file that imports the compiled WebAssembly module.

```javascript
import("../pkg");

```

--------------------------------

### Create new Cargo project

Source: https://kagura.gitbook.io/kagura-nusa-en

Command to create a new Rust library project that will be compiled to WebAssembly.

```bash
cargo new --lib crate-name
```

--------------------------------

### Define a Component: HelloComponent

Source: https://kagura.gitbook.io/kagura-nusa-en/single-component/creates-a-component

Defines a basic component named HelloComponent with its properties, messages, events, and rendering logic. This serves as a template for creating new components.

```rust
use kagura::pelude::*;
use nusa::prelude::*;

pub struct Props {}

pub enum Msg {}

pub enum On {}

pub struct HelloComponent {}

impl Component for HelloComponent {
    type Props = Props;
    type Msg = Msg;
    type Event = On;
}

impl HtmlComponent for HelloComponent {}

impl Constructor for HelloComponent {
    fn constructor(_props: Self::Props) -> Self {
        Self {}
    }
}

impl Update for HelloComponent {}

impl Render<Html> for HelloComponent {
    type Children = ();
    fn render(&self, _children: Self::Children) -> Html {
        Html::h1(
            Attributes::new(),
            Events::new(),
            vec![Html::text("Hello Component")]
        )
    }
}
```

--------------------------------

### Webpack configuration

Source: https://kagura.gitbook.io/kagura-nusa-en

Configuration for webpack, setting up the build process for a WebAssembly project, including HTML and WasmPack plugins.

```javascript
const path = require("path");
const HtmlWebpackPlugin = require("html-webpack-plugin");
const WasmPackPlugin = require("@wasm-tool/wasm-pack-plugin");

module.exports = {
    mode: "production",
    experiments: { syncWebAssembly: true },
    entry: "./template",
    output: {
        path: path.join(__dirname, "./dist")
    },
    resolve: {
        extensions: [".js"]
    },
    module: {
        rules: [],
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: path.join(__dirname, "./template/index.html"),
            inlineSource: ".(js|css)$"
        }),
        new WasmPackPlugin({
            crateDirectory: path.join(__dirname, "./"),
            forceMode: "production",
            target: "web",
            args: "--log-level error",
        }),
    ],
    devServer: {
        historyApiFallback: true,
    }
};

```

--------------------------------

### gitignore configuration

Source: https://kagura.gitbook.io/kagura-nusa-en

Standard .gitignore file for a Rust/Wasm project to exclude build artifacts and dependencies.

```gitignore
/target
/node_modules
/pkg

```

--------------------------------

### Constructor Trait for Component Initialization

Source: https://kagura.gitbook.io/kagura-nusa-en/single-component/nssesary-traits

Provides a constructor for initializing a component when it is mounted. Props are typically passed from a parent component.

```rust
pub trait Constructor: Component {
    fn constructor(_props: Self::Props) -> Self;
}
```

--------------------------------

### Cargo.toml dependencies

Source: https://kagura.gitbook.io/kagura-nusa-en

Configuration file for a Rust project, specifying dependencies like js-sys, kagura, nusa, and wasm-bindgen.

```toml
[package]
name = "hello-world"
version = "0.1.0"
edition="2021"

[lib]
crate-type = ["cdylib", "rlib"]

[dependencies]
js-sys="^0.3"
kagura="^0.14"
nusa="^0.1"
wasm-bindgen="^0.2"
wasm-bindgen-futures = "^0.4"

[dependencies.web-sys]
version="^0.3"
features=[
# If you want to use HtmlCanvasElement, Blob, IdbDatabase and so on, 
# add features hear.
]

```

--------------------------------

### HTML template

Source: https://kagura.gitbook.io/kagura-nusa-en

Basic HTML structure for the web page, including meta tags and a placeholder div for the application.

```html
<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>Kagura</title>
</head>

<body>
    <div id="app">
    </div>
</body>

</html>

```

--------------------------------

### Update Trait for Component Logic

Source: https://kagura.gitbook.io/kagura-nusa-en/single-component/nssesary-traits

Handles component updates and lifecycle events. Use `update` for general updates, `on_assemble` for the first mount, and `on_load` for subsequent mounts. `Cmd<Self>` is used to interact with Kagura.

```rust
pub trait Update: Component {
    fn on_assemble(self: Pin<&mut Self>) -> Cmd<Self> {
        Cmd::None
    }
    fn on_load(self: Pin<&mut Self>, _props: Self::Props) -> Cmd<Self> {
        Cmd::None
    }
    fn update(self: Pin<&mut Self>, _msg: Self::Msg) -> Cmd<Self> {
        Cmd::None
    }
}
```

--------------------------------

### Render Trait for HTML Components

Source: https://kagura.gitbook.io/kagura-nusa-en/single-component/nssesary-traits

Required for components that render HTML. Defines the type of output and associated children.

```rust
pub trait Render<T>: Component {
    type Children: Default;
    fn render(&self, children: Self::Children) -> T;
}
```

--------------------------------

### Component Trait Definition

Source: https://kagura.gitbook.io/kagura-nusa-en/single-component/nssesary-traits

Defines the fundamental types for a component: Props, Event, and Msg. This is the base trait for all components.

```rust
pub trait Component: Sized {
    type Props;
    type Event;
    type Msg;
}
```

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