### Install project dependencies

Source: https://docs.solidjs.com/solid-start/v2/getting-started

Install the necessary packages after project creation.

```bash
npm i
```

```bash
pnpm i
```

```bash
yarn i
```

```bash
bun i
```

```bash
deno i
```

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

### Import GET from SolidStart

Source: https://docs.solidjs.com/solid-start/v2/reference/server/get

Import the GET utility from the @solidjs/start package.

```typescript
import { GET } from "@solidjs/start";
```

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

### Start the development server

Source: https://docs.solidjs.com/solid-start/v2/getting-started

Launch the local development environment.

```bash
npm run dev
```

```bash
pnpm dev
```

```bash
yarn dev
```

```bash
bun run dev
```

```bash
deno run dev
```

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

### Basic Usage of StartServer

Source: https://docs.solidjs.com/solid-start/v2/reference/server/start-server

Example showing how to define a document component and use it with createHandler and StartServer.

```typescript
import { createHandler, StartServer } from "@solidjs/start/server";


function Document(props) {
  return (
    <html>
      <head>{props.assets}</head>
      <body>
        <div id="app">{props.children}</div>
        {props.scripts}
      </body>
    </html>
  );
}


export default createHandler((event) => <StartServer document={Document} />);
```

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

### Install and configure Temporal polyfill

Source: https://docs.solidjs.com/solid-start/v2/advanced/serialization

Install the polyfill and import it globally in entrypoints to support Temporal values if the runtime lacks native support.

```bash
pnpm add temporal-polyfill
```

```typescript
import "temporal-polyfill/global";
```

```typescript
import "./temporal";
```

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

### Install @solidjs/meta

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/head-and-metadata

Commands to install the @solidjs/meta package using various package managers.

```bash
npm i @solidjs/meta
```

```bash
pnpm i @solidjs/meta
```

```bash
yarn add @solidjs/meta
```

```bash
bun i @solidjs/meta
```

```bash
deno add npm:@solidjs/meta
```

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

### Install SolidStart v2 dependencies

Source: https://docs.solidjs.com/solid-start/v2/migrating-from-v1

Commands to install the required versions of SolidStart, Nitro, and Vite using various package managers.

```bash
npm i @solidjs/start@2.0.0 nitro@3.0.260610-beta vite@8
```

```bash
pnpm i @solidjs/start@2.0.0 nitro@3.0.260610-beta vite@8
```

```bash
yarn add @solidjs/start@2.0.0 nitro@3.0.260610-beta vite@8
```

```bash
bun i @solidjs/start@2.0.0 nitro@3.0.260610-beta vite@8
```

```bash
deno add npm:@solidjs/start@2.0.0 nitro@3.0.260610-beta vite@8
```

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

### Basic server entry configuration

Source: https://docs.solidjs.com/solid-start/v2/reference/entrypoints/entry-server

A complete example showing the Document component definition and the default handler export.

```typescript

import { createHandler, StartServer } from "@solidjs/start/server";


function Document(props) {
  return (
    <html>
      <head>{props.assets}</head>
      <body>
        <div id="app">{props.children}</div>
        {props.scripts}
      </body>
    </html>
  );
}


export default createHandler((event) => <StartServer document={Document} />);

```

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

### Install Netlify Vite Plugin

Source: https://docs.solidjs.com/solid-start/v2/guides/deployment-plugins

Install the Netlify Vite plugin as a development dependency.

```bash
npm i @netlify/vite-plugin -D
```

```bash
pnpm i @netlify/vite-plugin -D
```

```bash
yarn add @netlify/vite-plugin -D
```

```bash
bun i @netlify/vite-plugin -d
```

```bash
deno add npm:@netlify/vite-plugin -D
```

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

### Basic usage of createMiddleware

Source: https://docs.solidjs.com/solid-start/v2/reference/server/create-middleware

Example showing how to compose middleware that checks the response from the next handler.

```typescript
import { createMiddleware } from "@solidjs/start/middleware";


export default createMiddleware([
  async (event, next) => {
    const response = await next();
    if (response instanceof Response) return response;
    return new Response("Not found", { status: 404 });
  },
]);
```

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

### Basic GET Usage

Source: https://docs.solidjs.com/solid-start/v2/reference/server/get

Demonstrates how to use GET to extract the GET property from an object-assigned function.

```typescript
import { GET } from "@solidjs/start";


const getMessage = Object.assign(async () => "hello", {
  GET: async () => "hello",
});


const handler = GET(getMessage);
```

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

### Advanced Vite Configuration with Nitro Settings

Source: https://docs.solidjs.com/solid-start/v2/reference/entrypoints/vite-config

An extended configuration example demonstrating how to pass middleware and serialization options to solidStart, and server/prerendering settings to the nitro property.

```typescript
import { nitro } from "nitro/vite";
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [
    solidStart({
      middleware: "./src/middleware/index.ts",
      serialization: { mode: "json" },
    }),
    nitro(),
  ],
  nitro: {
    preset: "node_server",
    prerender: {
      routes: ["/"],
    },
  },
});
```

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

### Install Nitro

Source: https://docs.solidjs.com/solid-start/v2/guides/deployment-plugins

Install the Nitro package using your preferred package manager.

```bash
npm i nitro
```

```bash
pnpm i nitro
```

```bash
yarn add nitro
```

```bash
bun i nitro
```

```bash
deno add npm:nitro
```

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

### Basic usage of clientOnly

Source: https://docs.solidjs.com/solid-start/v2/reference/client/client-only

Example demonstrating how to wrap a component import with clientOnly and provide a fallback component.

```typescript
import { clientOnly } from "@solidjs/start";


const Map = clientOnly(() => import("./Map"), { lazy: true });


export default function Page() {
  return <Map fallback={<p>Loading map...</p>} />;
}
```

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

### Install Cloudflare Vite Plugin

Source: https://docs.solidjs.com/solid-start/v2/guides/deployment-plugins

Install the Cloudflare Vite plugin and wrangler as development dependencies.

```bash
npm i @cloudflare/vite-plugin wrangler -D
```

```bash
pnpm i @cloudflare/vite-plugin wrangler -D
```

```bash
yarn add @cloudflare/vite-plugin wrangler -D
```

```bash
bun i @cloudflare/vite-plugin wrangler -d
```

```bash
deno add npm:@cloudflare/vite-plugin wrangler -D
```

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

### GET(fn)

Source: https://docs.solidjs.com/solid-start/v2/reference/server/get

The GET function takes a function as an argument and returns its .GET property.

```APIDOC
## GET(fn)

### Description
Extracts the .GET property from a provided function.

### Parameters
- **fn** (function) - Required - A function that contains a .GET property.

### Return Value
- **Returns** (function) - The .GET property of the provided function.

### Example
```javascript
import { GET } from "@solidjs/start";

const getMessage = Object.assign(async () => "hello", {
  GET: async () => "hello",
});

const handler = GET(getMessage);
```
```

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

### Basic usage of HttpStatusCode

Source: https://docs.solidjs.com/solid-start/v2/reference/server/http-status-code

Example showing how to use the component to return a 404 status code.

```typescript

import { HttpStatusCode } from "@solidjs/start";


export default function NotFound() {
  return <HttpStatusCode code={404} />;
}

```

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

### Importing Assets with Vite

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/static-assets

Example of importing an asset directly into a component, which results in a hashed filename for cache busting.

```jsx
import logo from "./solid.png";


export default function About() {
  return (
    <>
      <h1>About</h1>
      <img src={logo} alt="Solid logo" />
      // Renders
      <img src="/assets/solid.2d8efhg.png" alt="Solid logo" />
    </>
  );
}
```

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

### Referencing Public Assets

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/static-assets

Example of using an absolute path to reference an asset stored in the public directory.

```jsx
export default function About() {
  return (
    <>
      <h1>About</h1>
      <img src="/images/logo.png" alt="Solid logo" />
    </>
  );
}
```

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

### Triggering an action with useAction

Source: https://docs.solidjs.com/solid-start/v2/guides/data-mutation

This example demonstrates defining an action and invoking it via a button click using the useAction hook.

```TypeScript
// src/routes/index.tsx
import { createSignal } from "solid-js";
import { action, useAction } from "@solidjs/router";


const addPost = action(async (title: string) => {
  await fetch("https://my-api.com/posts", {
    method: "POST",
    body: JSON.stringify({ title }),
  });
}, "addPost");


export default function Page() {
  const [title, setTitle] = createSignal("");
  const addPostAction = useAction(addPost);
  return (
    <div>
      <input value={title()} onInput={(e) => setTitle(e.target.value)} />
      <button onClick={() => addPostAction(title())}>Add Post</button>
    </div>
  );
}
```

```JavaScript
// src/routes/index.jsx
import { createSignal } from "solid-js";
import { action, useAction } from "@solidjs/router";


const addPost = action(async (title) => {
  await fetch("https://my-api.com/posts", {
    method: "POST",
    body: JSON.stringify({ title }),
  });
}, "addPost");


export default function Page() {
  const [title, setTitle] = createSignal("");
  const addPostAction = useAction(addPost);
  return (
    <div>
      <input value={title()} onInput={(e) => setTitle(e.target.value)} />
      <button onClick={() => addPostAction(title())}>Add Post</button>
    </div>
  );
}
```

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

### Basic HttpHeader Usage

Source: https://docs.solidjs.com/solid-start/v2/reference/server/http-header

Example of using HttpHeader to set a cache-control header in a page component.

```typescript

import { HttpHeader } from "@solidjs/start";


export default function Page() {
  return <HttpHeader name="cache-control" value="max-age=60" />;
}

```

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

### GET Type Definition

Source: https://docs.solidjs.com/solid-start/v2/reference/server/get

The type signature for the GET function.

```typescript
function GET<T extends (...args: any[]) => any>(
  fn: T
): (...args: Parameters<T>) => ReturnType<T>;
```

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

### Initialize a new SolidStart project

Source: https://docs.solidjs.com/solid-start/v2/getting-started

Use the scaffolding tool to create a new application. Requires Node.js 24 or newer.

```bash
npm init solid
```

```bash
pnpm create solid
```

```bash
yarn create solid
```

```bash
bun create solid
```

```bash
deno init --npm solid
```

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

### StartClient()

Source: https://docs.solidjs.com/solid-start/v2/reference/client/start-client

The StartClient component renders the generated solid-start:app module wrapped in a shared ErrorBoundary.

```APIDOC
## StartClient()

### Description
Renders the generated application inside the client error boundary. This component is typically used in the client-side entry point.

### Signature
`function StartClient(): JSX.Element`

### Parameters
- None

### Return Value
- **Type:** `JSX.Element` - The client app element.

### Example
```javascript
import { mount, StartClient } from "@solidjs/start/client";

mount(() => <StartClient />, document.getElementById("app")!);
```
```

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

### StartServer(props: { document: Component<DocumentComponentProps> })

Source: https://docs.solidjs.com/solid-start/v2/reference/server/start-server

The StartServer component renders the application inside a specified document component. It automatically registers assets, renders the DOCTYPE, and injects the application content.

```APIDOC
## StartServer

### Description
`StartServer` is a component that renders the generated app inside the provided document component. It reads the current request event, registers page assets, and wraps the app with error boundaries.

### Signature
`function StartServer(props: { document: Component<DocumentComponentProps> }): JSX.Element;`

### Props
- **document** (Component<DocumentComponentProps>) - Required - The document component rendered around the app.

### DocumentComponentProps
- **assets** (JSX.Element) - Optional - Assets to be rendered in the head.
- **scripts** (JSX.Element) - Required - Scripts to be rendered in the document.
- **children** (JSX.Element) - Optional - The application content.

### Example
```javascript
import { createHandler, StartServer } from "@solidjs/start/server";

function Document(props) {
  return (
    <html>
      <head>{props.assets}</head>
      <body>
        <div id="app">{props.children}</div>
        {props.scripts}
      </body>
    </html>
  );
}

export default createHandler((event) => <StartServer document={Document} />);
```
```

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

### solidStart(options?: SolidStartOptions)

Source: https://docs.solidjs.com/solid-start/v2/reference/config/solid-start

Initializes the SolidStart Vite plugin. This function should be included in the plugins array of your Vite configuration.

```APIDOC
## solidStart

### Description
Returns the Vite plugins required to build and run a SolidStart application with Vite's Environment API.

### Signature
`function solidStart(options?: SolidStartOptions): PluginOption[];`

### Usage
```javascript
import { nitro } from "nitro/vite";
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";

export default defineConfig({
  plugins: [solidStart(), nitro()],
});
```
```

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

### Importing mount and StartClient

Source: https://docs.solidjs.com/solid-start/v2/reference/entrypoints/entry-client

Required imports for initializing the client-side application.

```typescript
import { mount, StartClient } from "@solidjs/start/client";
```

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

### Import StartClient

Source: https://docs.solidjs.com/solid-start/v2/reference/client/start-client

Import the StartClient component from the @solidjs/start/client package.

```typescript
import { StartClient } from "@solidjs/start/client";
```

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

### Import StartServer

Source: https://docs.solidjs.com/solid-start/v2/reference/server/start-server

Import the StartServer component from the server package.

```typescript
import { StartServer } from "@solidjs/start/server";
```

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

### solidStart Configuration

Source: https://docs.solidjs.com/solid-start/v2/reference/config/solid-start

The solidStart function accepts an options object to configure the behavior of the SolidStart framework, including routing, server functions, and environment variables.

```APIDOC
## solidStart(options)

### Description
Configures the SolidStart framework via the `solidStart` function, typically used in the Vite configuration file.

### Parameters
- **appRoot** (string) - Optional - Path to the directory containing app.tsx or app.jsx. Default: "./src"
- **ssr** (boolean) - Optional - Enables server-side rendering. Default: true
- **devOverlay** (boolean) - Optional - Controls the development toolbar. Default: true
- **experimental.islands** (false) - Optional - Reserved for islands architecture support. Default: false
- **routeDir** (string) - Optional - Route directory relative to appRoot. Default: "./routes"
- **extensions** (string[]) - Optional - Additional file extensions for the router and compiler. Default: []
- **middleware** (string) - Optional - Path to the module that default-exports middleware.
- **serialization** (object) - Optional - Controls server-function argument and result serialization. { mode?: "json" | "js"; plugins?: string }
- **solid** (Partial<SolidOptions>) - Optional - Options forwarded to vite-plugin-solid.
- **serverFunctions.filter** (object) - Optional - Customizes which files the "use server" compiler scans. { include?: FilterPattern; exclude?: FilterPattern }
- **serverFunctions.onError** (string) - Optional - Path to a module whose default export handles values thrown by server functions.
- **env** (object) - Optional - Configures environment-variable virtual modules.
```

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

### Run production build

Source: https://docs.solidjs.com/solid-start/v2/migrating-from-v1

Commands to build the application for production across different package managers.

```bash
npm run build
```

```bash
pnpm build
```

```bash
yarn build
```

```bash
bun run build
```

```bash
deno run build
```

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

### Basic usage of StartClient

Source: https://docs.solidjs.com/solid-start/v2/reference/client/start-client

Mount the StartClient component to a DOM element using the mount function.

```typescript
import { mount, StartClient } from "@solidjs/start/client";


mount(() => <StartClient />, document.getElementById("app")!);
```

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

### Implement Server Function Error Handler

Source: https://docs.solidjs.com/solid-start/v2/reference/config/solid-start

Example implementation of a server function error handler that captures exceptions and returns a sanitized error.

```typescript
import type { ServerFunctionErrorHandler } from "@solidjs/start/server";
import { captureException } from "./your-monitoring-client";


const onServerFunctionError: ServerFunctionErrorHandler = (thrown) => {
  // redirect() throws a Response, so returning it preserves that control flow.
  if (thrown instanceof Response) {
    return thrown;
  }


  captureException(thrown); // or console.error, or any reporter


  return new Error("The server function failed.");
};


export default onServerFunctionError;
```

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

### Import getServerFunctionMeta

Source: https://docs.solidjs.com/solid-start/v2/reference/server/get-server-function-meta

Import the function from the @solidjs/start package.

```typescript
import { getServerFunctionMeta } from "@solidjs/start";
```

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

### Import createMiddleware

Source: https://docs.solidjs.com/solid-start/v2/reference/server/create-middleware

Import the function from the @solidjs/start/middleware package.

```typescript
import { createMiddleware } from "@solidjs/start/middleware";
```

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

### Use request helpers

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/api-routes

Import helpers from @solidjs/start/http to manage cookies, sessions, and headers within an API route.

```typescript
import { getCookie } from "@solidjs/start/http";
import type { APIEvent } from "@solidjs/start/server";


export function GET(_event: APIEvent) {
  const userId = getCookie("userId");
  if (!userId) {
    return new Response("Not logged in", { status: 401 });
  }


  return Response.json({ userId });
}
```

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

### Importing solidStart

Source: https://docs.solidjs.com/solid-start/v2/reference/config/solid-start

Import the solidStart function from the @solidjs/start/config package.

```typescript
import { solidStart } from "@solidjs/start/config";
```

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

### Import clientOnly

Source: https://docs.solidjs.com/solid-start/v2/reference/client/client-only

Import the clientOnly utility from the @solidjs/start package.

```typescript
import { clientOnly } from "@solidjs/start";
```

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

### Importing mount

Source: https://docs.solidjs.com/solid-start/v2/reference/client/mount

Import the mount function from the @solidjs/start/client package.

```typescript
import { mount } from "@solidjs/start/client";
```

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

### mount(callback, element)

Source: https://docs.solidjs.com/solid-start/v2/reference/entrypoints/entry-client

Mounts the SolidStart application to a specified DOM element.

```APIDOC
## mount(callback, element)

### Description
Initializes the client-side application by mounting the StartClient component into the provided DOM element.

### Parameters
- **callback** (function) - Required - A function that returns the StartClient component.
- **element** (HTMLElement) - Required - The DOM element where the application will be mounted.

### Example
```javascript
import { mount, StartClient } from "@solidjs/start/client";

mount(() => <StartClient />, document.getElementById("app")!);
```
```

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

### Configure Vite for SolidStart

Source: https://docs.solidjs.com/solid-start/v2/getting-started

Basic Vite configuration using the solidStart plugin.

```typescript
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [solidStart()],
});
```

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

### Configure Netlify Plugin

Source: https://docs.solidjs.com/solid-start/v2/guides/deployment-plugins

Enable build support in the Netlify plugin within the Vite configuration.

```javascript
import netlify from "@netlify/vite-plugin";
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [solidStart(), netlify({ build: { enabled: true } })],
});
```

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

### StartServer Type Definitions

Source: https://docs.solidjs.com/solid-start/v2/reference/server/start-server

Type definitions for the DocumentComponentProps and the StartServer component signature.

```typescript
type DocumentComponentProps = {
  assets?: JSX.Element;
  scripts: JSX.Element;
  children?: JSX.Element;
};


function StartServer(props: {
  document: Component<DocumentComponentProps>;
}): JSX.Element;
```

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

### Importing server utilities

Source: https://docs.solidjs.com/solid-start/v2/reference/entrypoints/entry-server

Required imports for configuring the server entry point.

```typescript

import { createHandler, StartServer } from "@solidjs/start/server";

```

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

### Configure Middleware

Source: https://docs.solidjs.com/solid-start/v2/advanced/middleware

Define a middleware function using createMiddleware and register it in the SolidStart configuration.

```typescript
import { createMiddleware } from "@solidjs/start/middleware";


export default createMiddleware([
  async (event, next) => {
    console.log("Request received:", event.req.url);
    const startedAt = Date.now();


    const response = await next();


    console.log(`Request took ${Date.now() - startedAt}ms`);
    return response;
  },
]);
```

```typescript
import { nitro } from "nitro/vite";
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [solidStart({ middleware: "./src/middleware/index.ts" }), nitro()],
});
```

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

### Import HttpHeader

Source: https://docs.solidjs.com/solid-start/v2/reference/server/http-header

Import the HttpHeader component from the @solidjs/start package.

```typescript

import { HttpHeader } from "@solidjs/start";

```

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

### Import HttpStatusCode

Source: https://docs.solidjs.com/solid-start/v2/reference/server/http-status-code

Import the component from the @solidjs/start package.

```typescript

import { HttpStatusCode } from "@solidjs/start";

```

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

### Configure Vite with middleware

Source: https://docs.solidjs.com/solid-start/v2/getting-started

Pass a middleware path to the solidStart plugin configuration.

```typescript
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [solidStart({ middleware: "./src/middleware/index.ts" })],
});
```

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

### Basic usage of createHandler

Source: https://docs.solidjs.com/solid-start/v2/reference/server/create-handler

Standard implementation of createHandler using the StartServer component.

```typescript

import { createHandler, StartServer } from "@solidjs/start/server";


export default createHandler((event) => <StartServer document={Document} />);

```

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

### Update HTTP helper imports

Source: https://docs.solidjs.com/solid-start/v2/migrating-from-v1

Replace imports from vinxi/http with @solidjs/start/http.

```typescript
import { getCookie, setCookie, useSession } from "@solidjs/start/http";
```

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

### Import createHandler

Source: https://docs.solidjs.com/solid-start/v2/reference/server/create-handler

Import the createHandler function from the @solidjs/start/server package.

```typescript

import { createHandler } from "@solidjs/start/server";

```

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

### Configure MetaProvider in Root

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/head-and-metadata

Wrap the application router with MetaProvider to enable metadata collection during server rendering and client navigation.

```javascript
import { MetaProvider } from "@solidjs/meta";
import { Router } from "@solidjs/router";
import { FileRoutes } from "@solidjs/start/router";
import { Suspense } from "solid-js";


export default function App() {
  return (
    <Router
      root={(props) => (
        <MetaProvider>
          <Suspense>{props.children}</Suspense>
        </MetaProvider>
      )}
    >
      <FileRoutes />
    </Router>
  );
}
```

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

### Import FileRoutes

Source: https://docs.solidjs.com/solid-start/v2/reference/routing/file-routes

Import the FileRoutes component from the @solidjs/start/router package.

```typescript
import { FileRoutes } from "@solidjs/start/router";
```

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

### Configure middleware in solidStart

Source: https://docs.solidjs.com/solid-start/v2/migrating-from-v1

Pass the middleware path to the solidStart plugin configuration.

```typescript
import { defineConfig } from "vite";
import { nitro } from "nitro/vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [solidStart({ middleware: "./src/middleware/index.ts" }), nitro()],
});
```

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

### StartClient Type Definition

Source: https://docs.solidjs.com/solid-start/v2/reference/client/start-client

The function signature for the StartClient component.

```typescript
function StartClient(): JSX.Element;
```

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

### Register custom Seroval plugins

Source: https://docs.solidjs.com/solid-start/v2/advanced/serialization

Point to a module containing custom Seroval plugins in the solidStart configuration.

```typescript
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [
    solidStart({
      serialization: {
        plugins: "src/seroval-plugins.ts",
      },
    }),
  ],
});
```

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

### mount(fn, el)

Source: https://docs.solidjs.com/solid-start/v2/reference/client/mount

Hydrates the client application into the provided DOM element.

```APIDOC
## mount(fn, el)

### Description
Mounts the client application by hydrating the provided element. This function is equivalent to the standard Solid `hydrate` function.

### Signature
`function mount(fn: () => JSX.Element, el: MountableElement): (() => void) | undefined;`

### Parameters
- **fn** (() => JSX.Element) - Required - A function that returns the client app element.
- **el** (MountableElement) - Required - The DOM element used as the hydration root.

### Return Value
- **(() => void) | undefined** - Returns the result of the hydration process.

### Example
```javascript
import { mount, StartClient } from "@solidjs/start/client";

mount(() => <StartClient />, document.getElementById("app")!);
```
```

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

### Importing Global CSS

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/css-and-styling

Use standard ESM syntax to import CSS files for global application styling.

```tsx
import "./Card.css";


const Card = (props) => {
  return (
    <div class="card">
      <h1>{props.title}</h1>
      <p>{props.text}</p>
    </div>
  );
};
```

```css
.card {
  background-color: #446b9e;
}


h1 {
  font-size: 1.5em;
  font-weight: bold;
}


p {
  font-size: 1em;
  font-weight: normal;
}
```

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

### Defining solidStart Type

Source: https://docs.solidjs.com/solid-start/v2/reference/config/solid-start

The solidStart function accepts optional configuration and returns an array of Vite PluginOptions.

```typescript
function solidStart(options?: SolidStartOptions): PluginOption[];
```

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

### Create a basic API route

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/api-routes

Define an API route by exporting an HTTP method function from a file in the src/routes directory.

```typescript
export function GET() {
  return new Response("pong");
}
```

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

### Implementing Protected Routes with Solid Router

Source: https://docs.solidjs.com/solid-start/v2/advanced/auth

Redirects unauthenticated users to a login page during data fetching. Requires deferStream: true to handle redirects before streaming begins.

```javascript
const getPrivatePosts = query(async function () {
  "use server";
  const user = await getUser();
  if (!user) {
    throw redirect("/login");
  }


  return db.getPosts({ userId: user.id, private: true });
});


export default function Page() {
  const posts = createAsync(() => getPrivatePosts(), { deferStream: true });
}
```

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

### Configure Environment Variable Modules

Source: https://docs.solidjs.com/solid-start/v2/reference/config/solid-start

Customizes the prefixes and runtime environments for virtual environment modules.

```javascript
solidStart({
  env: {
    server: { prefix: "PRIVATE_", runtime: "node" },
    client: { prefix: "PUBLIC_" },
  },
});
```

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

### createHandler(fn, options?, routerLoad?)

Source: https://docs.solidjs.com/solid-start/v2/reference/server/create-handler

Creates the handler used by the server entry to render the application.

```APIDOC
## createHandler(fn, options?, routerLoad?)

### Description
Creates the handler used by the server entry. This function defines how the application is rendered on the server.

### Parameters
- **fn** ((context: PageEvent) => JSX.Element) - Required - Function that returns the server-rendered document.
- **options** (HandlerOptions | (context: PageEvent) => HandlerOptions | Promise<HandlerOptions>) - Optional - Rendering options or a function that returns rendering options.
- **routerLoad** ((event: FetchEvent) => Promise<void>) - Optional - Optional setup function for a custom router.

### HandlerOptions Fields
- **mode** ("sync" | "async" | "stream") - Optional - Rendering mode (default: "stream").
- **nonce** (string) - Optional - Nonce assigned to the page event.
- **renderId** (string) - Optional - Render identifier passed to the render context.
- **onCompleteAll** ((options: { write: (value: any) => void }) => void) - Optional - Callback used when all stream content is ready.
- **onCompleteShell** ((options: { write: (value: any) => void }) => void) - Optional - Callback used when the shell stream is ready.

### Return Value
- **StartHandler** - Returns the H3 application used by the server entry.
```

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

### Handle Headers and Cookies

Source: https://docs.solidjs.com/solid-start/v2/advanced/middleware

Access and set cookies or headers using SolidStart's HTTP helpers within middleware.

```typescript
import { getCookie, setCookie } from "@solidjs/start/http";
import { createMiddleware } from "@solidjs/start/middleware";


export default createMiddleware([
  async (event, next) => {
    const theme = getCookie("theme") ?? "system";
    setCookie("theme", theme, {
      httpOnly: true,
      secure: true,
      sameSite: "lax",
    });


    const response = await next();
    event.res.headers.set("x-theme", theme);
    return response;
  },
]);
```

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

### Pre-render specific routes

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/route-prerendering

Explicitly define a list of routes to be pre-rendered during the build process.

```javascript
import { nitro } from "nitro/vite";
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [solidStart(), nitro()],
  nitro: {
    prerender: {
      routes: ["/", "/about"],
    },
  },
});
```

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

### createMiddleware(args: Middleware[])

Source: https://docs.solidjs.com/solid-start/v2/reference/server/create-middleware

Composes an array of H3 middleware. Middleware can execute logic before or after the next handler in the chain by awaiting the next() function.

```APIDOC
## createMiddleware(args)

### Description
Composes an array of H3 middleware for handling requests and responses. Each middleware receives the event and a next function.

### Parameters
- **args** (Middleware[]) - Required - An array of H3 middleware to be composed.

### Return Value
- **Returns** (Middleware[]) - The composed middleware array.

### Usage Example
```javascript
import { createMiddleware } from "@solidjs/start/middleware";

export default createMiddleware([
  async (event, next) => {
    const response = await next();
    if (response instanceof Response) return response;
    return new Response("Not found", { status: 404 });
  },
]);
```
```

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

### Using CSS Modules

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/css-and-styling

Apply locally scoped styles by using files with .module.css extensions and referencing the imported object.

```tsx
import styles from "./Card.module.css";


const Card = (props) => {
  return (
    <div class={styles.card}>
      <h1>{props.title}</h1>
      <p>{props.text}</p>
    </div>
  );
};
```

```css
.card {
  background-color: #446b9e;
}


div.card > h1 {
  font-size: 1.5em;
  font-weight: bold;
}


div.card > p {
  font-size: 1em;
  font-weight: normal;
}
```

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

### Configure Cloudflare Plugin

Source: https://docs.solidjs.com/solid-start/v2/guides/deployment-plugins

Map the Worker to the ssr environment using the cloudflare plugin.

```javascript
import { cloudflare } from "@cloudflare/vite-plugin";
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [cloudflare({ viteEnvironment: { name: "ssr" } }), solidStart()],
});
```

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

### Apply "use server" as a file directive

Source: https://docs.solidjs.com/solid-start/v2/reference/server/use-server

Place the directive at the top of a file to mark all exported async functions as server functions.

```typescript

"use server";


export async function logMessage(message: string) {
  console.log(message);
}

```

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

### clientOnly(fn, options)

Source: https://docs.solidjs.com/solid-start/v2/reference/client/client-only

Wraps an async component import to ensure it only renders on the client, with support for a fallback component during server-side rendering.

```APIDOC
## clientOnly(fn, options)

### Description
Wraps an async component import and renders a fallback on the server. The client loads the component immediately unless lazy loading is enabled.

### Parameters
- **fn** (() => Promise<{ default: T }>) - Required - Function that imports the client component.
- **options** ({ lazy?: boolean }) - Optional - Loading options. A truthy lazy defers the import to the returned component.

### Return Value
- Returns a component that accepts props and an optional fallback JSX element.

### Example
```javascript
import { clientOnly } from "@solidjs/start";

const Map = clientOnly(() => import("./Map"), { lazy: true });

export default function Page() {
  return <Map fallback={<p>Loading map...</p>} />;
}
```
```

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

### createHandler

Source: https://docs.solidjs.com/solid-start/v2/reference/entrypoints/entry-server

The createHandler function is used to define the server entry point, receiving a PageEvent and returning a handler for the application.

```APIDOC
## createHandler

### Description
Creates an event handler for the server entry point, typically used to render the StartServer component.

### Parameters
- **callback** (function) - Required - A function that receives a `PageEvent` and returns the JSX to be rendered, usually containing the `StartServer` component.

### Example
```typescript
import { createHandler, StartServer } from "@solidjs/start/server";

export default createHandler((event) => <StartServer document={Document} />);
```
```

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

### Configure Middleware

Source: https://docs.solidjs.com/solid-start/v2/reference/config/solid-start

Sets the path to the module that default-exports middleware.

```javascript
solidStart({ middleware: "./src/middleware/index.ts" });
```

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

### Configuring TypeScript types for environment

Source: https://docs.solidjs.com/solid-start/v2/advanced/request-events

Include the @solidjs/start/env type entry in tsconfig.json to provide the base namespace for request locals.

```json
{
  "compilerOptions": {
    "types": ["@solidjs/start/env"]
  }
}
```

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

### Apply Nonce in entry-server.tsx

Source: https://docs.solidjs.com/solid-start/v2/guides/security

Passes the nonce from the request locals to the StartServer component.

```typescript
// src/entry-server.tsx
// @refresh reload
import { createHandler, StartServer } from "@solidjs/start/server";


export default createHandler(
  () => <StartServer /* ... */ />,
  (event) => ({ nonce: event.locals.nonce })
);
```

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

### Remove legacy dependencies

Source: https://docs.solidjs.com/solid-start/v2/migrating-from-v1

Commands to remove deprecated packages used in SolidStart v1.

```bash
npm remove vinxi @solidjs/vite-plugin-nitro-2 nitropack
```

```bash
pnpm remove vinxi @solidjs/vite-plugin-nitro-2 nitropack
```

```bash
yarn remove vinxi @solidjs/vite-plugin-nitro-2 nitropack
```

```bash
bun remove vinxi @solidjs/vite-plugin-nitro-2 nitropack
```

```bash
deno remove npm:vinxi @solidjs/vite-plugin-nitro-2 nitropack
```

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

### Importing CSS via URL

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/css-and-styling

Mount complex global CSS files specifically for a route using the ?url import suffix and the Link component.

```tsx
import { Link } from "@solidjs/meta";
import styleUrl from "./about.css?url";


export default function About() {
  return (
    <main>
      <Link rel="stylesheet" href={styleUrl} />
      <h1>About us</h1>
    </main>
  );
}
```

```css
@import "tailwindcss";
```

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

### Enable link crawling for pre-rendering

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/route-prerendering

Configure the crawler to automatically discover and pre-render routes by following links found in the generated HTML.

```javascript
export default defineConfig({
  plugins: [solidStart(), nitro()],
  nitro: {
    prerender: {
      crawlLinks: true,
      failOnError: true,
    },
  },
});
```

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

### Import using path alias

Source: https://docs.solidjs.com/solid-start/v2/getting-started

Use the built-in ~ alias to import files from the application root.

```typescript
import { db } from "~/lib/db";
```

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

### Configure Nitro Plugin

Source: https://docs.solidjs.com/solid-start/v2/guides/deployment-plugins

Add the nitro plugin to the Vite configuration after the solidStart plugin.

```javascript
import { nitro } from "nitro/vite";
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [solidStart(), nitro()],
});
```

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

### Update package.json scripts

Source: https://docs.solidjs.com/solid-start/v2/migrating-from-v1

Replace Vinxi scripts with standard Vite scripts.

```json
{
  "scripts": {
    "dev": "vite dev",
    "build": "vite build",
    "preview": "vite preview"
  }
}
```

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

### Define and consume a basic query

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/data-fetching

Use query to define a cached data fetcher and createAsync to access the data within a component.

```typescript
import { For } from "solid-js";
import { createAsync, query } from "@solidjs/router";


const getPosts = query(async () => {
  const response = await fetch("https://example.com/api/posts");
  return response.json() as Promise<Array<{ id: number; title: string }>>;
}, "posts");


export default function PostsPage() {
  const posts = createAsync(() => getPosts());


  return <For each={posts()}>{(post) => <li>{post.title}</li>}</For>;
}
```

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

### Fetch data with query and createAsync

Source: https://docs.solidjs.com/solid-start/v2/guides/data-fetching

Use the query primitive to define a data fetcher and createAsync to consume the result in a component.

```TypeScript
// src/routes/index.tsx
import { For } from "solid-js";
import { query, createAsync } from "@solidjs/router";


const getPosts = query(async () => {
  const posts = await fetch("https://my-api.com/posts");
  return await posts.json();
}, "posts");


export default function Page() {
  const posts = createAsync(() => getPosts());
  return (
    <ul>
      <For each={posts()}>{(post) => <li>{post.title}</li>}</For>
    </ul>
  );
}
```

```JavaScript
// src/routes/index.jsx
import { For } from "solid-js";
import { query, createAsync } from "@solidjs/router";


const getPosts = query(async () => {
  const posts = await fetch("https://my-api.com/posts");
  return await posts.json();
}, "posts");


export default function Page() {
  const posts = createAsync(() => getPosts());
  return (
    <ul>
      <For each={posts()}>{(post) => <li>{post.title}</li>}</For>
    </ul>
  );
}
```

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

### Prefill action arguments

Source: https://docs.solidjs.com/solid-start/v2/building-your-application/data-mutation

Uses the .with() method to bind specific arguments to an action before it is triggered by a form.

```typescript
import { action } from "@solidjs/router";


const archiveProject = action(async (projectId: string, formData: FormData) => {
  "use server";


  return {
    projectId,
    reason: formData.get("reason")?.toString() ?? null,
  };
}, "archiveProject");


export default function ProjectPage(props: { params: { id: string } }) {
  return (
    <form action={archiveProject.with(props.params.id)} method="post">
      <input name="reason" />
      <button>Archive</button>
    </form>
  );
}
```

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

### Connect to WebSocket from Browser

Source: https://docs.solidjs.com/solid-start/v2/advanced/websocket

Use the standard browser WebSocket API to connect to the defined server endpoint.

```javascript
const protocol = location.protocol === "https:" ? "wss:" : "ws:";
const socket = new WebSocket(`${protocol}//${location.host}/ws`);


socket.addEventListener("open", () => socket.send("Hello"));
socket.addEventListener("message", (event) => console.log(event.data));
```

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

### Define a Background Task

Source: https://docs.solidjs.com/solid-start/v2/guides/background-tasks

Create a task by exporting a defineTask object in a file within the server/tasks directory.

```typescript
import { defineTask } from "nitro/task";


export default defineTask({
  meta: {
    name: "db:cleanup",
    description: "Remove expired sessions",
  },
  async run({ payload, context }) {
    const cleanup = deleteExpiredSessions();
    context.waitUntil?.(cleanup);
    const deleted = await cleanup;


    return {
      result: { deleted, requestedBy: payload.requestedBy },
    };
  },
});
```

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

### Basic app.tsx usage

Source: https://docs.solidjs.com/solid-start/v2/reference/entrypoints/app

Standard implementation of the root component using the Router and FileRoutes components.

```tsx
import { Router } from "@solidjs/router";
import { FileRoutes } from "@solidjs/start/router";


export default function App() {
  return (
    <Router>
      <FileRoutes />
    </Router>
  );
}
```

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

### Implement loading UI with Suspense

Source: https://docs.solidjs.com/solid-start/v2/guides/data-fetching

Wrap data-dependent components in a Suspense boundary with a fallback prop to display loading states.

```TypeScript
// src/routes/index.tsx
import { Suspense, For } from "solid-js";
import { query, createAsync } from "@solidjs/router";


const getPosts = query(async () => {
  const posts = await fetch("https://my-api.com/posts");
  return await posts.json();
}, "posts");


export default function Page() {
  const posts = createAsync(() => getPosts());
  return (
    <ul>
      <Suspense fallback={<div>Loading...</div>}>
        <For each={posts()}>{(post) => <li>{post.title}</li>}</For>
      </Suspense>
    </ul>
  );
}
```

```JavaScript
// src/routes/index.jsx
import { Suspense, For } from "solid-js";
import { query, createAsync } from "@solidjs/router";


const getPosts = query(async () => {
  const posts = await fetch("https://my-api.com/posts");
  return await posts.json();
}, "posts");


export default function Page() {
  const posts = createAsync(() => getPosts());
  return (
    <ul>
      <Suspense fallback={<div>Loading...</div>}>
        <For each={posts()}>{(post) => <li>{post.title}</li>}</For>
      </Suspense>
    </ul>
  );
}
```

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

### Configure CSP without Nonce

Source: https://docs.solidjs.com/solid-start/v2/guides/security

Sets a static Content-Security-Policy header after the downstream handler returns.

```typescript
import { createMiddleware } from "@solidjs/start/middleware";


export default createMiddleware([
  async (event, next) => {
    const response = await next();
    const csp = `
      default-src 'self';
      font-src 'self'  ;
      object-src 'none';
      base-uri 'none';
      frame-ancestors 'none';
      form-action 'self';
    `.replace(/\s+/g, " ");


    event.res.headers.set("Content-Security-Policy", csp);
    return response;
  },
]);
```

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

### Define a WebSocket Server Handler

Source: https://docs.solidjs.com/solid-start/v2/advanced/websocket

Create a server route using defineWebSocketHandler to manage connection lifecycles and messaging.

```typescript
import { defineWebSocketHandler } from "nitro";


export default defineWebSocketHandler({
  open(peer) {
    console.log("open", peer.id);
    peer.send("Connected");
  },
  message(peer, message) {
    console.log("message", peer.id, message.text());
    peer.send(message.text());
  },
  close(peer, details) {
    console.log("close", peer.id, details.code, details.reason);
  },
  error(peer, error) {
    console.error("websocket error", peer.id, error);
  },
});
```

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

### Define the "use server" directive constant

Source: https://docs.solidjs.com/solid-start/v2/reference/server/use-server

Represents the directive string used by the compiler.

```typescript

const DIRECTIVE = "use server";

```

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

### Configure serialization mode in Vite

Source: https://docs.solidjs.com/solid-start/v2/advanced/serialization

Set the serialization mode in the solidStart plugin configuration within vite.config.ts.

```typescript
import { defineConfig } from "vite";
import { solidStart } from "@solidjs/start/config";


export default defineConfig({
  plugins: [
    solidStart({
      serialization: { mode: "json" },
    }),
  ],
});
```

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

### Implement middleware using createMiddleware

Source: https://docs.solidjs.com/solid-start/v2/migrating-from-v1

Define middleware using the createMiddleware function with an array of H3 v2 handlers.

```typescript
import { createMiddleware } from "@solidjs/start/middleware";


export default createMiddleware([
  async (event, next) => {
    event.context.startedAt = Date.now();
    const response = await next();
    console.log(`Request took ${Date.now() - event.context.startedAt}ms`);
    return response;
  },
]);
```

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

### Configure Server Function Error Handling

Source: https://docs.solidjs.com/solid-start/v2/reference/config/solid-start

Sets the path to a module that handles errors thrown by server functions before serialization.

```javascript
solidStart({
  serverFunctions: {
    onError: "src/server-function-error.ts",
  },
});
```