exploration for Apollo Client integration

examples/react/start-basic-apollo-client/.gitignore

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+node_modules
+package-lock.json
+yarn.lock
+
+.DS_Store
+.cache
+.env
+.vercel
+.output
+.vinxi
+
+/build/
+/api/
+/server/build
+/public/build
+.vinxi
+# Sentry Config File
+.env.sentry-build-plugin
+/test-results/
+/playwright-report/
+/blob-report/
+/playwright/.cache/

examples/react/start-basic-apollo-client/.prettierignore

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+**/build
+**/public
+pnpm-lock.yaml
+routeTree.gen.ts

examples/react/start-basic-apollo-client/README.md

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+# Welcome to TanStack.com!
+
+This site is built with TanStack Router!
+
+- [TanStack Router Docs](https://tanstack.com/router)
+
+It's deployed automagically with Vercel!
+
+- [Vercel](https://vercel.com/)
+
+## Development
+
+From your terminal:
+
+```sh
+pnpm install
+pnpm dev
+```
+
+This starts your app in development mode, rebuilding assets on file changes.
+
+## Editing and previewing the docs of TanStack projects locally
+
+The documentations for all TanStack projects except for `React Charts` are hosted on [https://tanstack.com](https://tanstack.com), powered by this TanStack Router app.
+In production, the markdown doc pages are fetched from the GitHub repos of the projects, but in development they are read from the local file system.
+
+Follow these steps if you want to edit the doc pages of a project (in these steps we'll assume it's [`TanStack/form`](https://github.com/tanstack/form)) and preview them locally :
+
+1. Create a new directory called `tanstack`.
+
+```sh
+mkdir tanstack
+```
+
+2. Enter the directory and clone this repo and the repo of the project there.
+
+```sh
+cd tanstack
+git clone [email protected]:TanStack/tanstack.com.git
+git clone [email protected]:TanStack/form.git
+```
+
+> [!NOTE]
+> Your `tanstack` directory should look like this:
+>
+> ```
+> tanstack/
+>    |
+>    +-- form/
+>    |
+>    +-- tanstack.com/
+> ```
+
+> [!WARNING]
+> Make sure the name of the directory in your local file system matches the name of the project's repo. For example, `tanstack/form` must be cloned into `form` (this is the default) instead of `some-other-name`, because that way, the doc pages won't be found.
+
+3. Enter the `tanstack/tanstack.com` directory, install the dependencies and run the app in dev mode:
+
+```sh
+cd tanstack.com
+pnpm i
+# The app will run on https://localhost:3000 by default
+pnpm dev
+```
+
+4. Now you can visit http://localhost:3000/form/latest/docs/overview in the browser and see the changes you make in `tanstack/form/docs`.
+
+> [!NOTE]
+> The updated pages need to be manually reloaded in the browser.
+
+> [!WARNING]
+> You will need to update the `docs/config.json` file (in the project's repo) if you add a new doc page!

examples/react/start-basic-apollo-client/app.config.ts

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+import { defineConfig } from '@tanstack/start/config'
+import tsConfigPaths from 'vite-tsconfig-paths'
+
+export default defineConfig({
+  vite: {
+    plugins: [
+      tsConfigPaths({
+        projects: ['./tsconfig.json'],
+      }),
+    ],
+  },
+})

examples/react/start-basic-apollo-client/app/api.ts

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+import {
+  createStartAPIHandler,
+  defaultAPIFileRouteHandler,
+} from '@tanstack/start/api'
+
+export default createStartAPIHandler(defaultAPIFileRouteHandler)

examples/react/start-basic-apollo-client/app/apollo/ApolloClient.tsx

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+import {
+  ReadFromReadableStreamLink,
+  TeeToReadableStreamLink,
+  ApolloClient as _ApolloClient,
+} from '@apollo/client-react-streaming'
+import { ApolloLink } from '@apollo/client/index.js'
+import { ensureHydrated } from './createQueryPreloader'
+import type { HookWrappers } from '@apollo/client/react/internal'
+
+function id<T>(x: T): T {
+  return x
+}
+
+const WRAPPERS = Symbol.for('apollo.hook.wrappers')
+
+export class ApolloClient extends _ApolloClient {
+  constructor(options: ConstructorParameters<typeof _ApolloClient>[0]) {
+    super(options)
+    this.setLink(this.link)
+
+    const queryManager = this['queryManager'] as { [WRAPPERS]: HookWrappers }
+
+    const origWrappers = { ...queryManager[WRAPPERS] }
+
+    queryManager[WRAPPERS] = {
+      ...origWrappers,
+      useReadQuery: (originalHook) => (queryRef) => {
+        return (origWrappers.useReadQuery || id)(originalHook)(
+          ensureHydrated(queryRef, this),
+        )
+      },
+      useQueryRefHandlers: (originalHook) => (queryRef) => {
+        return (origWrappers.useQueryRefHandlers || id)(originalHook)<any, any>(
+          ensureHydrated(queryRef, this),
+        )
+      },
+    } satisfies HookWrappers
+  }
+
+  setLink(newLink: ApolloLink) {
+    _ApolloClient.prototype.setLink.call(
+      this,
+      ApolloLink.from([
+        ReadFromReadableStreamLink,
+        TeeToReadableStreamLink,
+        newLink,
+      ]),
+    )
+  }
+}

examples/react/start-basic-apollo-client/app/apollo/ApolloProvider.tsx

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+import {
+  DataTransportContext,
+  WrapApolloProvider,
+} from '@apollo/client-react-streaming'
+import { useRouter } from '@tanstack/react-router'
+import { useCallback, useEffect, useId, useMemo, useRef } from 'react'
+import type { QueryEvent } from '@apollo/client-react-streaming'
+
+const APOLLO_EVENT_PREFIX = '@@apollo.event/'
+const APOLLO_HOOK_PREFIX = '@@apollo.hook/'
+
+const handledEvents = new WeakSet<object>()
+
+export const ApolloProvider = (props: React.PropsWithChildren) => {
+  const router = useRouter()
+  return (
+    <WrappedApolloProvider
+      makeClient={() => router.options.context.apolloClient}
+    >
+      {props.children}
+    </WrappedApolloProvider>
+  )
+}
+
+const WrappedApolloProvider = WrapApolloProvider((props) => {
+  const router = useRouter()
+
+  const consumeBackPressure = useCallback(() => {
+    for (const key of router.streamedKeys) {
+      if (key.startsWith(APOLLO_EVENT_PREFIX)) {
+        const streamedValue = router.getStreamedValue(key)
+        if (
+          streamedValue &&
+          typeof streamedValue === 'object' &&
+          !handledEvents.has(streamedValue) &&
+          props.onQueryEvent
+        ) {
+          handledEvents.add(streamedValue)
+          props.onQueryEvent(streamedValue as QueryEvent)
+        }
+      }
+    }
+  }, [router, props.onQueryEvent])
+
+  if (router.isServer) {
+    props.registerDispatchRequestStarted!(({ event, observable }) => {
+      const id = crypto.randomUUID() as typeof event.id
+      event.id = id
+      router.streamValue(
+        `${APOLLO_EVENT_PREFIX}${event.id}/${event.type}`,
+        event satisfies QueryEvent,
+      )
+      observable.subscribe({
+        next(event) {
+          event.id = id
+          router.streamValue(
+            `${APOLLO_EVENT_PREFIX}${event.id}/${event.type}`,
+            event satisfies QueryEvent,
+          )
+        },
+      })
+    })
+  } else {
+    // this needs to happen synchronously before the render continues
+    // so "loading" is kicked off before the respecitve component is rendered
+    consumeBackPressure()
+  }
+
+  useEffect(() => {
+    consumeBackPressure()
+    return router.subscribe('onStreamedValue', ({ key }) => {
+      if (!key.startsWith(APOLLO_EVENT_PREFIX)) return
+      const streamedValue = router.getStreamedValue(key)
+      if (streamedValue && props.onQueryEvent) {
+        handledEvents.add(streamedValue)
+        props.onQueryEvent(streamedValue as QueryEvent)
+      }
+    })
+  }, [consumeBackPressure, router, props.onQueryEvent])
+
+  const dataTransport = useMemo(() => ({ useStaticValueRef }), [])
+
+  return (
+    <DataTransportContext.Provider value={dataTransport}>
+      {props.children}
+    </DataTransportContext.Provider>
+  )
+})
+
+function useStaticValueRef<T>(value: T) {
+  const router = useRouter()
+  const key = APOLLO_HOOK_PREFIX + useId()
+  const dataValue =
+    !router.isServer && router.streamedKeys.has(key)
+      ? (router.getStreamedValue(key) as T)
+      : value
+  const dataRef = useRef(dataValue)
+
+  if (router.isServer) {
+    if (!router.streamedKeys.has(key)) {
+      router.streamValue(key, value)
+    }
+  }
+  return dataRef
+}