test: add e2e fixtures for new experimental TanStack Start RSC #651
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| import * as React from 'react' | ||
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| /** | ||
| * A client-only interactive counter component. | ||
| * Used as a child slot inside a server-rendered composite component | ||
| * to demonstrate RSC composition with client interactivity. | ||
| */ | ||
| export function Counter() { | ||
| const [count, setCount] = React.useState(0) | ||
| return ( | ||
| <div data-testid="client-counter"> | ||
| <p>Client-side counter: <span data-testid="counter-value">{count}</span></p> | ||
| <button data-testid="counter-button" onClick={() => setCount((c) => c + 1)}> | ||
| Increment | ||
| </button> | ||
| </div> | ||
| ) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| import { createFileRoute } from '@tanstack/react-router' | ||
| import { fetchRscGreeting, fetchRscUserList } from '~/utils/rsc' | ||
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| export const Route = createFileRoute('/rsc-basic')({ | ||
| loader: async () => { | ||
| const [greeting, users] = await Promise.all([ | ||
| fetchRscGreeting(), | ||
| fetchRscUserList(), | ||
| ]) | ||
| return { ...greeting, ...users } | ||
| }, | ||
| component: RscBasicPage, | ||
| }) | ||
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| function RscBasicPage() { | ||
| const { Greeting, UserList } = Route.useLoaderData() | ||
| return ( | ||
| <div className="p-2"> | ||
| <h2>RSC Basic Demo</h2> | ||
| <p>This page demonstrates basic React Server Components rendered via <code>renderServerComponent</code>.</p> | ||
| <hr /> | ||
| {Greeting} | ||
| <hr /> | ||
| {UserList} | ||
| </div> | ||
| ) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| import { createFileRoute } from '@tanstack/react-router' | ||
| import { CompositeComponent } from '@tanstack/react-start/rsc' | ||
| import { fetchRscCard } from '~/utils/rsc' | ||
| import { Counter } from '~/components/Counter' | ||
|
|
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| export const Route = createFileRoute('/rsc-composite')({ | ||
| loader: () => fetchRscCard(), | ||
| component: RscCompositePage, | ||
| }) | ||
|
|
||
| function RscCompositePage() { | ||
| const { Card } = Route.useLoaderData() | ||
| return ( | ||
| <div className="p-2"> | ||
| <h2>RSC Composite Demo</h2> | ||
| <p> | ||
| This page demonstrates <code>createCompositeComponent</code> with children slots. | ||
| The card shell is rendered on the server, while the counter inside is a client component. | ||
| </p> | ||
| <hr /> | ||
| <CompositeComponent src={Card}> | ||
| <Counter /> | ||
| </CompositeComponent> | ||
| </div> | ||
| ) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| import * as React from 'react' | ||
| import { createServerFn } from '@tanstack/react-start' | ||
| import { | ||
| renderServerComponent, | ||
| createCompositeComponent, | ||
| } from '@tanstack/react-start/rsc' | ||
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|
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| /** | ||
| * A basic server function that renders a server component using renderServerComponent. | ||
| * The component fetches data on the server and renders it — the fetch logic never | ||
| * reaches the client bundle. | ||
| */ | ||
| export const fetchRscGreeting = createServerFn().handler(async () => { | ||
| // Simulate server-only work (e.g., DB query, secret API call) | ||
| const timestamp = new Date().toISOString() | ||
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| const Greeting = await renderServerComponent( | ||
| <div data-testid="rsc-greeting"> | ||
| <h2>Hello from a Server Component!</h2> | ||
| <p>This was rendered on the server at {timestamp}.</p> | ||
| <p> | ||
| This content comes from a React Server Component. The rendering logic | ||
| and any server-only dependencies never reach the client bundle. | ||
| </p> | ||
| </div>, | ||
| ) | ||
|
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| return { Greeting } | ||
| }) | ||
|
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| /** | ||
| * A server function that fetches data and renders it as a server component. | ||
| * Demonstrates data fetching colocated within an RSC. | ||
| */ | ||
| export const fetchRscUserList = createServerFn().handler(async () => { | ||
| const res = await fetch('https://jsonplaceholder.typicode.com/users') | ||
| if (!res.ok) { | ||
| throw new Error('Failed to fetch users for RSC') | ||
| } | ||
| const users = (await res.json()) as Array<{ id: number; name: string; email: string }> | ||
|
Comment on lines
+36
to
+40
Contributor
There was a problem hiding this comment. Avoid hard dependency on live third-party API in e2e fixture path. At Line 36-Line 40, the fixture relies on a public API at request time. This makes RSC tests non-deterministic and vulnerable to external outages/rate limits. Suggested deterministic fallback pattern export const fetchRscUserList = createServerFn().handler(async () => {
- const res = await fetch('https://jsonplaceholder.typicode.com/users')
- if (!res.ok) {
- throw new Error('Failed to fetch users for RSC')
- }
- const users = (await res.json()) as Array<{ id: number; name: string; email: string }>
+ const fallbackUsers: Array<{ id: number; name: string; email: string }> = [
+ { id: 1, name: 'Leanne Graham', email: 'leanne@example.com' },
+ { id: 2, name: 'Ervin Howell', email: 'ervin@example.com' },
+ { id: 3, name: 'Clementine Bauch', email: 'clementine@example.com' },
+ { id: 4, name: 'Patricia Lebsack', email: 'patricia@example.com' },
+ { id: 5, name: 'Chelsey Dietrich', email: 'chelsey@example.com' },
+ ]
+
+ let users = fallbackUsers
+ try {
+ const res = await fetch('https://jsonplaceholder.typicode.com/users')
+ if (res.ok) {
+ users = (await res.json()) as Array<{ id: number; name: string; email: string }>
+ }
+ } catch {
+ // keep deterministic fallback for fixture stability
+ }🤖 Prompt for AI Agents |
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| const UserList = await renderServerComponent( | ||
| <div data-testid="rsc-user-list"> | ||
| <h3>Users (Server Component)</h3> | ||
| <ul> | ||
| {users.slice(0, 5).map((user) => ( | ||
| <li key={user.id} data-testid={`rsc-user-${user.id}`}> | ||
| {user.name} — {user.email} | ||
| </li> | ||
| ))} | ||
| </ul> | ||
| </div>, | ||
| ) | ||
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| return { UserList } | ||
| }) | ||
|
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| /** | ||
| * A composite component that accepts children slots. | ||
| * The server renders the outer shell, and client components can be | ||
| * passed as children. | ||
| */ | ||
| export const fetchRscCard = createServerFn().handler(async () => { | ||
| const src = await createCompositeComponent( | ||
| (props: { children?: React.ReactNode }) => ( | ||
| <div data-testid="rsc-card" style={{ border: '1px solid #ccc', padding: '16px', borderRadius: '8px' }}> | ||
| <h3>Server-Rendered Card</h3> | ||
| <p>This card shell is rendered on the server.</p> | ||
| <div data-testid="rsc-card-children">{props.children}</div> | ||
| </div> | ||
| ), | ||
| ) | ||
|
|
||
| return { Card: src } | ||
| }) | ||
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Stabilize post-click counter assertion to avoid async flake.
At Line 100-Line 102, the value is read immediately after click. This can intermittently fail before state commit in slower environments.
Suggested fix
📝 Committable suggestion
🤖 Prompt for AI Agents