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@oomfware/jsx

v0.1.8

Published

server-side JSX renderer

Downloads

844

Readme

@oomfware/jsx

server-side JSX renderer with streaming support, Suspense, and context.

npm install @oomfware/jsx

configure your tsconfig.json to use this package as the JSX runtime:

{
	"compilerOptions": {
		"jsx": "react-jsx",
		"jsxImportSource": "@oomfware/jsx"
	}
}

usage

render JSX responses in your route handlers:

import { createRouter, route } from '@oomfware/fetch-router';
import { render, Suspense, use } from '@oomfware/jsx';

const routes = route({
	home: '/',
	users: {
		index: '/users',
		show: '/users/:id',
	},
});

const router = createRouter();

router.map(routes, {
	home() {
		return render(<HomePage />);
	},
	users: {
		index() {
			return render(<UserList />);
		},
		show({ params }) {
			return render(<UserProfile userId={params.id} />);
		},
	},
});

function HomePage() {
	return (
		<html>
			<head>
				<title>my app</title>
			</head>
			<body>
				<h1>welcome</h1>
			</body>
		</html>
	);
}

streaming with Suspense

the page shell streams immediately while async sections resolve in the background:

import { render, Suspense, use } from '@oomfware/jsx';

interface User {
	name: string;
	posts: { title: string }[];
}

function UserPosts({ user }: { user: Promise<User> }) {
	const { posts } = use(user);
	return (
		<ul>
			{posts.map((post) => (
				<li>{post.title}</li>
			))}
		</ul>
	);
}

function UserPage({ user }: { user: Promise<User> }) {
	return (
		<html>
			<head>
				<title>user profile</title>
			</head>
			<body>
				<h1>posts</h1>
				<Suspense fallback={<div>loading posts...</div>}>
					<UserPosts user={user} />
				</Suspense>
			</body>
		</html>
	);
}

router.get('/users/:id', ({ params }) => {
	const user = fetch(`/api/users/${params.id}`).then((r) => r.json());
	return render(<UserPage user={user} />);
});

the promise is created in the handler and passed down - use() caches by promise identity, so the same instance must be used across renders.

error responses

render errors with custom status codes:

router.get('/admin', ({ store }) => {
	const user = store.inject(userKey);
	if (!user) {
		return render(<LoginPage />, { status: 401 });
	}
	return render(<AdminDashboard user={user} />);
});

context

share values across components without prop drilling:

import { createContext, renderToString, use } from '@oomfware/jsx';

const ThemeContext = createContext('light');

function ThemedButton() {
	const theme = use(ThemeContext);
	return <button class={theme}>click me</button>;
}

const html = await renderToString(
	<ThemeContext.Provider value="dark">
		<ThemedButton />
	</ThemeContext.Provider>,
);
// <button class="dark">click me</button>

head hoisting

<title>, <meta>, <link>, and <style> elements are automatically hoisted to <head>:

function Page() {
	return (
		<div>
			<title>my page</title>
			<meta name="description" content="page description" />
			<h1>content</h1>
		</div>
	);
}