Vite React SSG

Static-site generation for React on Vite.

See demo(also document): docs

🎈 Support for @tanstack/router and wouter is in progress!

Support for the @tanstack/router router is still experimental, and pathname.lazy.tsx routes are not yet supported. For usage examples, see: main/examples/tanstack/src/main.tsx

Table of contents

• Usage
• Use CSR during development
• Extra route options
  • entry
  • getStaticPaths
• Data fetch
• lazy
• <ClientOnly/>
• Document head
  • Reactive head
• Public Base Path
• CSS in JS
• Critical CSS
• Configuration
  • Custom Routes to Render
• Roadmap
• Credits

Usage

npm i -D vite-react-ssg react-router-dom

// package.json
{
  "scripts": {
-   "build": "vite build"
+   "build": "vite-react-ssg build"
    // If you need ssr when dev
-   "dev": "vite",
+   "dev": "vite-react-ssg dev",

    // OR if you want to use another vite config file
+   "build": "vite-react-ssg build -c another-vite.config.ts"
  }
}

// src/main.ts
import { ViteReactSSG } from 'vite-react-ssg'
import routes from './App.tsx'

export const createRoot = ViteReactSSG(
  // react-router-dom data routes
  { routes },
  // function to have custom setups
  ({ router, routes, isClient, initialState }) => {
    // do something.
  },
)

// src/App.tsx
import React from 'react'
import type { RouteRecord } from 'vite-react-ssg'
import './App.css'
import Layout from './Layout'

export const routes: RouteRecord[] = [
  {
    path: '/',
    element: <Layout />,
    entry: 'src/Layout.tsx',
    children: [
      {
        path: 'a',
        lazy: () => import('./pages/a'),
      },
      {
        index: true,
        Component: React.lazy(() => import('./pages/index')),
      },
      {
        path: 'nest/:b',
        lazy: () => {
          const Component = await import('./pages/nest/[b]')
          return { Component }
        },
        // To determine which paths will be pre-rendered
        getStaticPaths: () => ['nest/b1', 'nest/b2'],
      },
    ],
  },
]

Use CSR during development

Vite React SSG provide SSR (Server-Side Rendering) during development to ensure consistency between development and production as much as possible.

But if you want to use CSR during development, just:

// package.json
{
  "scripts": {
-   "dev": "vite-react-ssg dev",
+   "dev": "vite",
    "build": "vite-react-ssg build"
  }
}

Single Page SSG

For SSG of an index page only (i.e. without react-router-dom); import vite-react-ssg/single-page instead.

// src/main.tsx
import { ViteReactSSG } from 'vite-react-ssg/single-page'
import App from './App.tsx'

export const createRoot = ViteReactSSG(<App />)

Extra route options

The RouteObject of vite-react-ssg is based on react-router, and vite-react-ssg receives some additional properties.

getStaticPaths

The getStaticPaths() function should return an array of path to determine which paths will be pre-rendered by vite-react-ssg.

This function is only valid for dynamic route.

const route = {
  path: 'nest/:b',
  lazy: () => import('./pages/nest/[b]'),
  entry: 'src/pages/nest/[b].tsx',
  // To determine which paths will be pre-rendered
  getStaticPaths: () => ['nest/b1', 'nest/b2'],
}

entry

You are not required to use this field. It is only necessary when "prehydration style loss" occurs. It should be the path from root to the target file.

eg: src/pages/page1.tsx

lazy

These options work well with the lazy field.

// src/pages/[page].tsx
export function Component() {
  return (
    <div>{/* your component */}</div>
  )
}

export function getStaticPaths() {
  return ['page1', 'page2']
}

// src/routes.ts
const routes = [
  {
    path: '/:page',
    lazy: () => import('./pages/[page]'),
  }
]

Note that during the build process, vite-react-ssg will automatically detect the files directly dynamically imported in the function you pass to the lazy field. This helps vite-react-ssg to get the route's style files or other static resources during the build, preventing flash of unstyled content.

If you still encounter FOUC (flash of unstyled content), please open an issue.

If your component isn't loading, make sure you have wrapped it or its parent in Suspense tags as described in the React documentation.

See example.

Data fetch

You can use react-router-dom's loader to fetch data at build time and use useLoaderData to get the data in the component.

In production, the loader will only be executed at build time, and the data will be fetched by the manifest generated at build time during the browser navigations .

In the development environment, the loader also runs only on the server.It provides data to the HTML during initial server rendering, and during browser route navigations , it makes calls to the server by initiating a fetch on the service.

import { useLoaderData } from 'react-router-dom'

export default function Docs() {
  const data = useLoaderData() as Awaited<ReturnType<typeof loader>>

  return (
    <>
      <div>{data.key}</div>
      {/* eslint-disable-next-line react-dom/no-dangerously-set-innerhtml */}
      <div dangerouslySetInnerHTML={{ __html: data.packageCodeHtml }} style={{ textAlign: 'start' }}></div>
    </>
  )
}

export const Component = Docs

export const entry = 'src/pages/json.tsx'

export async function loader() {
  // The code here will not be executed on the client side, and the modules imported will not be sent to the client.
  const fs = (await import('node:fs'))
  const cwd = process.cwd()
  const json = (await import('../docs/test.json')).default

  const packageJson = await fs.promises.readFile(`${cwd}/package.json`, 'utf-8')
  const { codeToHtml } = await import('shiki')
  const packageJsonHtml = await codeToHtml(packageJson, { lang: 'json', theme: 'vitesse-light' })

  return {
    ...json,
    packageCodeHtml: packageJsonHtml,
  }
}

See example | with-loader.

<ClientOnly/>

If you need to render some component in browser only, you can wrap your component with <ClientOnly>.

import { ClientOnly } from 'vite-react-ssg'

function MyComponent() {
  return (
    <ClientOnly>
      {() => {
        return <div>{window.location.href}</div>
      }}
    </ClientOnly>
  )
}

It's important that the children of <ClientOnly> is not a JSX element, but a function that returns an element. Because React will try to render children, and may use the client's API on the server.

Document head

You can use <Head/> to manage all of your changes to the document head. It takes plain HTML tags and outputs plain HTML tags. It is a wrapper around React Helmet.

import { Head } from 'vite-react-ssg'

function MyHead() {
  return (
    <Head>
      <meta property="og:description" content="My custom description" />
      <meta charSet="utf-8" />
      <title>My Title</title>
      <link rel="canonical" href="http://mysite.com/example" />
    </Head>
  )
}

Nested or latter components will override duplicate usages:

import { Head } from 'vite-react-ssg'

function MyHead() {
  return (
    <parent>
      <Head>
        <title>My Title</title>
        <meta name="description" content="Helmet application" />
      </Head>
      <child>
        <Head>
          <title>Nested Title</title>
          <meta name="description" content="Nested component" />
        </Head>
      </child>
    </parent>
  )
}

Outputs:

<head>
  <title>Nested Title</title>
  <meta name="description" content="Nested component" />
</head>

Reactive head

import { useState } from 'react'
import { Head } from 'vite-react-ssg'

export default function MyHead() {
  const [state, setState] = useState(false)

  return (
    <Head>
      <meta charSet="UTF-8" />
      <link rel="icon" type="image/svg+xml" href="/vite.svg" />
      <title>head test {state ? 'A' : 'B'}</title>
      {/* You can also set the 'body' attributes here */}
      <body className={`body-class-in-head-${state ? 'a' : 'b'}`} />
    </Head>
  )
}

Public Base Path

Just set base in vite.config.ts like:

// vite.config.ts
import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react-swc'

// https://vitejs.dev/config/
export default defineConfig({
  plugins: [react()],
  base: '/base-path',
})

// main.ts
import { ViteReactSSG } from 'vite-react-ssg'
import { routes } from './App'
import './index.css'

export const createRoot = ViteReactSSG(
  {
    routes,
    // pass your BASE_URL
    basename: import.meta.env.BASE_URL,
  },
)

Vite React SSG will give it to the react-router's basename.

See: react-router's create-browser-router

Example

Future config

export const createRoot = ViteReactSSG(
  {
    routes,
    basename: import.meta.env.BASE_URL,
    future: {
      v7_normalizeFormMethod: true,
      v7_startTransition: true,
      v7_fetcherPersist: true,
      v7_relativeSplatPath: true,
      v7_skipActionErrorRevalidation: true,
      v7_partialHydration: true,
    },
  },
)

See: react-router's optsfuture

Example

CSS in JS

Use the getStyleCollector option to specify an SSR/SSG style collector. Currently only supports styled-components.

import { ViteReactSSG } from 'vite-react-ssg'
import getStyledComponentsCollector from 'vite-react-ssg/style-collectors/styled-components'
import { routes } from './App.js'
import './index.css'

export const createRoot = ViteReactSSG(
  { routes },
  () => { },
  { getStyleCollector: getStyledComponentsCollector }
)

You can provide your own by looking at the implementation of any of the existing collectors.

Critical CSS

Vite React SSG has built-in support for generating Critical CSS inlined in the HTML via the beasties package. Install it with:

npm i -D beasties

Critical CSS generation will automatically be enabled for you.

To configure beasties, pass its options into ssgOptions.beastiesOptions in vite.config.ts:

// vite.config.ts
export default defineConfig({
  ssgOptions: {
    beastiesOptions: {
      // E.g., change the preload strategy
      preload: 'media',
      // Other options: https://github.com/danielroe/beasties#usage
    },
  },
})

Configuration

You can pass options to Vite SSG in the ssgOptions field of your vite.config.js

// vite.config.js

export default {
  plugins: [],
  ssgOptions: {
    script: 'async',
  },
}

interface ViteReactSSGOptions {
  /**
   * Set the scripts' loading mode. Only works for `type="module"`.
   *
   * @default 'sync'
   */
  script?: 'sync' | 'async' | 'defer' | 'async defer'
  /**
   * Build format.
   *
   * @default 'esm'
   */
  format?: 'esm' | 'cjs'
  /**
   * The path of the main entry file (relative to the project root).
   *
   * @default 'src/main.ts'
   */
  entry?: string
  /**
   * Mock browser global variables (window, document, etc...) from SSG.
   *
   * @default false
   */
  mock?: boolean
  /**
   * Apply formatter to the generated index file.
   *
   * **It will cause Hydration Failed.**
   *
   * @default 'none'
   */
  formatting?: 'prettify' | 'none'
  /**
   * Vite environment mode.
   */
  mode?: string
  /**
   * Directory style of the output directory.
   *
   * flat: `/foo` -> `/foo.html`
   * nested: `/foo` -> `/foo/index.html`
   *
   * @default 'flat'
   */
  dirStyle?: 'flat' | 'nested'
  /**
   * Generate for all routes, including dynamic routes.
   * If enabled, you will need to configure your serve
   * manually to handle dynamic routes properly.
   *
   * @default false
   */
  includeAllRoutes?: boolean
  /**
   * Options for the beasties packages.
   *
   * @see https://github.com/danielroe/beasties#usage
   */
  beastiesOptions?: BeastiesOptions | false
  /**
   * Custom function to modify the routes to do the SSG.
   *
   * Works only when `includeAllRoutes` is set to false.
   *
   * Defaults to a handler that filters out all the dynamic routes.
   * When passing your custom handler, you should also take care of the dynamic routes yourself.
   */
  includedRoutes?: (paths: string[], routes: Readonly<RouteRecord[]>) => Promise<string[]> | string[]
  /**
   * Callback to be called before every page render.
   *
   * It can be used to transform the project's `index.html` file before passing it to the renderer.
   *
   * To do so, you can change the 'index.html' file contents (passed in through the `indexHTML` parameter), and return it.
   * The returned value will then be passed to renderer.
   */
  onBeforePageRender?: (route: string, indexHTML: string, appCtx: ViteReactSSGContext<true>) => Promise<string | null | undefined> | string | null | undefined
  /**
   * Callback to be called on every rendered page.
   *
   * It can be used to transform the current route's rendered HTML.
   *
   * To do so, you can transform the route's rendered HTML (passed in through the `renderedHTML` parameter), and return it.
   * The returned value will be used as the HTML of the route.
   */
  onPageRendered?: (route: string, renderedHTML: string, appCtx: ViteReactSSGContext<true>) => Promise<string | null | undefined> | string | null | undefined

  onFinished?: () => Promise<void> | void
  /**
   * The application's root container `id`.
   *
   * @default `root`
   */
  rootContainerId?: string
  /**
   * The size of the SSG processing queue.
   *
   * @default 20
   */
  concurrency?: number
}

See src/types.ts. for more options available.

Custom Routes to Render

You can use the includedRoutes hook to include or exclude route paths to render, or even provide some completely custom ones.

// vite.config.js

export default {
  plugins: [],
  ssgOptions: {
    includedRoutes(paths, routes) {
      // exclude all the route paths that contains 'foo'
      return paths.filter(i => !i.includes('foo'))
    },
  },
}

// vite.config.js

export default {
  plugins: [],
  ssgOptions: {
    includedRoutes(paths, routes) {
      // use original route records
      return routes.flatMap(route => {
        return route.name === 'Blog'
          ? myBlogSlugs.map(slug => `/blog/${slug}`)
          : route.path
      })
    },
  },
}

export default defineConfig({
  server: {
    https: true,
  },
})

React17 Support

• for react18, with flag useLegacyRender: true, it will use the legacy render and hydrate methods.
• for react17, on top of above, you will need minor update to react and react-dom example to polyfill the mjs import and the react-dom/client.

Roadmap

• Preload assets
• Document head
• SSR in dev environment
• More Client components, such as <ClientOnly />
• getStaticPaths for dynamic routes

Credits

This project inspired by vite-ssg, thanks to @antfu for his awesome work.

License

MIT License © 2023 Riri