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ReactStream

React SSR with client-side hydration in Val Town

{count}

\n \n \n \n \n );\n}\n\nexport default render(App, import.meta.url);\n```\n\n[Live example](https://www.val.town/v/jxnblk/ReactStreamDemo)\n\nTo render static HTML without hydration, pass `false` as the second argument.\n\n```tsx\nexport default render(App, false);\n```\n\n## Middleware\n\nCustom middleware can be added in an array as the third argument.\nMiddleware can add data to the `req.data` object or return a response for things like API endpoints.\n\n```tsx\nexport default render(App, import.meta.url, [\n analytics,\n robots(\"User-agent: *\\nAllow: /\"),\n getInitialProps\n])\n```\n\n### robots.txt\n\nReactStream has a built-in middleware to handle request to `/robots.txt`\n\n```tsx\nimport { render, robots } from \"https://esm.town/v/jxnblk/ReactStream\";\n// ...\nexport default render(App, import.meta.url, [\n robots(\"User-agent: *\\nAllow: /\"),\n])\n```\n\n### Add a backend request handler\n\n```tsx\n// example middleware\nasync function api (req: Request, res: Response, next): Promise {\n if (req.pathname !== \"/api\") return next();\n if (req.method === \"POST\") {\n return Repsonse.json({ message: \"Hello POST request\" });\n }\n return Response.json({ ok: true });\n}\n\nexport default render(App, import.meta.url, [ api ]);\n```\n\n### Fetch data on the server to set initial props\n\n\n```tsx \n// example middleware\nasync function getInitialProps (req: Request, res: Response, next) {\n // fetch data or do async work to pass as props to the component\n req.data = {\n hello: \"props\",\n };\n return next();\n}\n\nexport default render(App, import.meta.url, [ getInitialProps ]);\n```\n\n## Starter template\n\n```tsx\n/** @jsxImportSource https://esm.sh/react */\nimport { render } from \"https://esm.town/v/jxnblk/ReactStream\";\n\nfunction App () {\n return (\n \n \n ReactStream\n \n \n hello\n \n \n );\n}\n\nexport default render(App, import.meta.url, []);\n```\n\nReact requires matching versions for SSR and hydration.\nImport `React` from `https://esm.town/v/jxnblk/ReactStream` to ensure your component uses the same version as this library (currently react@18.3.1).\n\nInspired by https://www.val.town/v/stevekrouse/react_http & https://www.val.town/v/stevekrouse/reactClientDemo\n","script","5f2b064e-d33e-11ef-be8b-e6cdfca9ef9f","/** @jsxImportSource https://esm.sh/react@18.3.1 */\nimport { hydrateRoot } from \"https://esm.sh/react-dom@18.3.1/client\";\nimport * as React from \"https://esm.sh/react@18.3.1\";\n\nexport { React };\n\nexport type RequestHandler = (request: Request) => Promise;\nexport type DataFetcher = (request: Request) => Promise;\n\n// export type DataRequest = Request & { data: T };\nexport type DataRequest = Request & { data: any };\nexport type NextCallback = () => Promise;\nexport type Middleware = (req: DataRequest, res: Response, callback: NextCallback) => Promise;\n\nexport interface ReactStreamProps {\n url: URL;\n pathname: string;\n search: string;\n searchParams: Record;\n headers: Headers;\n cookie: string;\n}\n\nexport function render(\n /** Root-level React component that renders an entire element\n * including the head and body tags.\n */\n Component: React.ComponentType,\n /** On Val Town, use `import.meta.url` for client-side hydration */\n module: string | false,\n /** Optional middleware */\n opts: ReactStreamOptions | Middleware[] = [],\n) {\n const useMiddleware = Array.isArray(opts); // for backwards compat\n const options: ReactStreamOptions = !Array.isArray(opts) ? opts : {};\n const { api, getInitialProps } = options;\n\n if (typeof document !== \"undefined\" && module) {\n const props = window.__data;\n hydrateRoot(document, );\n }\n\n return async function handler(request: Request): Promise {\n const main = reactStream(Component, module);\n const middleware: Middleware[] = [\n parseURL,\n parseHeaders,\n // DEPRECATED (for backwards compat)\n options.robots && robots(options.robots),\n options.api && deprecatedCustomAPI(options.api),\n options.getInitialProps && deprecatedGetInitiaProps(options.getInitialProps),\n // New custom middleware\n ...(useMiddleware ? opts.slice() : []),\n main,\n ].filter(Boolean);\n\n let res: Response = new Response();\n const req: DataRequest = Object.assign(request.clone(), { data: {} });\n req.data = {};\n\n const next = async (nextRes?: Response): Promise => {\n const fn = middleware.shift();\n if (nextRes) res = nextRes;\n if (!fn) return main(req, res);\n return fn(req, res, next);\n };\n return next();\n };\n}\n\nexport default render;\n\n// main react response handler\nconst reactStream = (\n Component: React.ComponentType,\n module: string | false,\n): Middleware =>\n async function(req: DataRequest, res: Response): Promise {\n const { renderToReadableStream } = await import(\"https://esm.sh/react-dom@18.3.1/server\");\n\n const stream = await renderToReadableStream(\n ,\n module\n ? {\n bootstrapModules: [module],\n bootstrapScriptContent: `window.__data=${JSON.stringify(req.data)}`,\n }\n : {},\n );\n const headers = res.headers;\n headers.set(\"Content-Type\", \"text/html\");\n\n console.log(\"react\", res.status);\n return new Response(stream, {\n headers,\n status: res.status,\n statusText: res.statusText,\n });\n };\n\n// default middleware\nconst parseURL: Middleware = async (req, res, next) => {\n const url = new URL(req.url);\n const { pathname, search } = url;\n req.data.url = url;\n req.data.pathname = pathname;\n req.data.search = search;\n req.data.searchParams = Object.fromEntries(req.data.url.searchParams);\n return next();\n};\n\nconst parseHeaders: Middleware = async (req, res, next) => {\n req.data.headers = req.headers;\n req.data.cookie = req.headers.get(\"cookie\");\n return next();\n};\n\n/** respond to /robots.txt with a custom string */\nexport const robots = (txt: string): Middleware => async (req, res, next) => {\n const url = new URL(req.url);\n if (txt && url.pathname === \"/robots.txt\") {\n return new Response(txt, { headers: { \"Content-Type\": \"text/plain\" } });\n }\n return next();\n};\n\n// DEPRECATED\n// DEPRECATE (for backwards compat)\nconst deprecatedCustomAPI = (api?: RequestHandler): Middleware => async (req, res, next) => {\n if (!api) return next();\n if (req.method === \"GET\") return next();\n return api(req);\n};\nconst deprecatedGetInitiaProps = (getProps: DataFetcher): Middleware => async (req, res, next) => {\n if (!getProps) return next();\n const data = await getProps(req);\n req.data = data;\n return next();\n};\n/** DEPRECATED: Use middleware instead */\nexport interface ReactStreamOptions {\n /** DEPRECATED: Optional text response for robots.txt */\n robots?: string;\n /** DEPRECATED: Optional API request handler for all non-GET methods */\n api?: RequestHandler;\n /** DEPRECATED: data fetcher to set initial props based on request */\n getInitialProps?: DataFetcher;\n}",["D",1736945030972],59,{"_131":132,"_133":134},{"_114":281,"_131":132,"_99":282,"_119":283,"_284":-5},"82ae5e96-46e8-11ef-9a21-de64eea55b61","resrvStreaming",43,"prDisabledHint","React SSR and client-side hydration for Val Town Usage /** @jsxImportSource https://esm.sh/react */\nimport { render, React } from \"https://esm.town/v/jxnblk/ReactStream\";\n\nfunction App() {\n const [count, setCount] = React.useState(0);\n return (\n \n \n

ReactStream

React SSR with client-side hydration in Val Town

{count}

\n \n \n \n \n );\n}\n\nexport default render(App, import.meta.url); Live example To render static HTML without hydration, pass false as the second argument. export default render(App, false); Middleware Custom middleware can be added in an array as the third argument.\nMiddleware can add data to the req.data object or return a response for things like API endpoints. export default render(App, import.meta.url, [\n analytics,\n robots(\"User-agent: *\\nAllow: /\"),\n getInitialProps\n]) robots.txt ReactStream has a built-in middleware to handle request to /robots.txt import { render, robots } from \"https://esm.town/v/jxnblk/ReactStream\";\n// ...\nexport default render(App, import.meta.url, [\n robots(\"User-agent: *\\nAllow: /\"),\n]) Add a backend request handler // example middleware\nasync function api (req: Request, res: Response, next): Promise {\n if (req.pathname !== \"/api\") return next();\n if (req.method === \"POST\") {\n return Repsonse.json({ message: \"Hello POST request\" });\n }\n return Response.json({ ok: true });\n}\n\nexport default render(App, import.meta.url, [ api ]); Fetch data on the server to set initial props // example middleware\nasync function getInitialProps (req: Request, res: Response, next) {\n // fetch data or do async work to pass as props to the component\n req.data = {\n hello: \"props\",\n };\n return next();\n}\n\nexport default render(App, import.meta.url, [ getInitialProps ]); Starter template /** @jsxImportSource https://esm.sh/react */\nimport { render } from \"https://esm.town/v/jxnblk/ReactStream\";\n\nfunction App () {\n return (\n \n \n ReactStream\n \n \n hello\n \n \n );\n}\n\nexport default render(App, import.meta.url, []); React requires matching versions for SSR and hydration.\nImport React from https://esm.town/v/jxnblk/ReactStream to ensure your component uses the same version as this library (currently react@18.3.1). Inspired by https://www.val.town/v/stevekrouse/react_http & https://www.val.town/v/stevekrouse/reactClientDemo","latestEvaluation","jxnblk/ReactStream",[289,293,296,299,302,305,308,311,314,317],{"_117":290,"_119":163,"_291":292},["D",1736945030972],"n","1",{"_117":294,"_119":167,"_291":295},["D",1723637949789],"2",{"_117":297,"_119":171,"_291":298},["D",1723637873981],"3",{"_117":300,"_119":175,"_291":301},["D",1723635708848],"4",{"_117":303,"_119":179,"_291":304},["D",1723635543320],"5",{"_117":306,"_119":183,"_291":307},["D",1723585518479],"6",{"_117":309,"_119":187,"_291":310},["D",1723004026796],"7",{"_117":312,"_119":191,"_291":313},["D",1723004015920],"8",{"_117":315,"_119":195,"_291":316},["D",1723003203414],"9",{"_117":318,"_119":199,"_291":319},["D",1723003126812],"10","dependenciesCount","valname","page",{"_114":112,"_99":100,"_131":132,"_11":97,"_119":120,"_101":102,"_115":116,"_106":107,"_113":26,"_137":138},"routes/_app","actionData","errors"]