test(e2e): generate relay fixture types from OpenAPI

README.md

@@ -68,6 +68,7 @@ sent to the browser.
 ```bash
 nix develop -c pnpm dev
 nix develop -c pnpm dev:tailscale
+nix develop -c pnpm generate:e2e-openapi
 nix develop -c pnpm knip
 nix develop -c pnpm test
 nix develop -c pnpm test:e2e
@@ -79,8 +80,19 @@ nix develop -c pnpm start
 `test:e2e` is intentionally Nix-only and uses the system Chromium supplied by
 the dev shell. Browser tests are organized under `e2e/`: page object models
 and fixtures are shared by integration flows and Axe checks for WCAG 2.0/2.1
-A and AA. `test:live` is an explicit, opt-in smoke test that performs exactly
+A and AA. The tests keep a standalone HTTP relay so TanStack Start server
-one read-only Top search using the configured relay.
+functions and SSR requests exercise the same network boundary as production.
+The API client and fixture types are generated with Orval from a pinned
+[twitter-openapi specification](https://github.com/fa0311/twitter-openapi/commit/590dae5c9f8575abc91d3774946bfe6f23960aba);
+run `generate:e2e-openapi` only when updating that pin or the selected
+operations. Generated files are committed, so normal E2E runs do not require
+network access. E2E fixtures use the generated response types but stay
+deterministic. Runtime requests continue through Bird because its transport
+differs from the upstream OpenAPI client. Relay-only endpoints, request
+transport differences, cursors, and stateful failure scenarios remain in the
+handwritten mock server.
+`test:live` is an explicit, opt-in smoke test that performs exactly one
+read-only Top search using the configured relay.
 
 Development binds to `127.0.0.1` by default. `dev:tailscale` binds to
 `0.0.0.0`, so it exposes the app on LAN interfaces as well as Tailscale. Use it

e2e/fixtures/twitter.ts

@@ -0,0 +1,35 @@
+import type { TweetLegacy } from '../generated/twitter-openapi/client.ts'
+
+interface TweetLegacyFixtureOptions {
+  conversationId?: string
+  inReplyTo?: string
+  replyCount?: number
+}
+
+export const tweetLegacyFixture = (
+  id: string,
+  text: string,
+  {
+    conversationId = id,
+    inReplyTo,
+    replyCount = 1,
+  }: TweetLegacyFixtureOptions = {},
+): TweetLegacy => ({
+  bookmark_count: 0,
+  bookmarked: false,
+  conversation_id_str: conversationId,
+  created_at: 'Mon Jul 13 00:00:00 +0000 2026',
+  display_text_range: [0, text.length],
+  favorite_count: 3,
+  favorited: false,
+  full_text: text,
+  id_str: id,
+  ...(inReplyTo ? { in_reply_to_status_id_str: inReplyTo } : {}),
+  is_quote_status: false,
+  lang: 'ja',
+  quote_count: 0,
+  reply_count: replyCount,
+  retweet_count: 2,
+  retweeted: false,
+  user_id_str: '42',
+})

e2e/mock-relay.mjs

@@ -1,4 +1,5 @@
 import { createServer } from 'node:http'
+import { tweetLegacyFixture } from './fixtures/twitter.ts'
 
 const portValue = process.env.TWITTER_LITE_MOCK_RELAY_PORT
 const port = Number(portValue)
@@ -30,15 +31,11 @@ const tweetResult = (
   { conversationId = id, inReplyTo, replyCount = 1 } = {},
 ) => ({
   rest_id: id,
-  legacy: {
+  legacy: tweetLegacyFixture(id, text, {
-    full_text: text,
+    conversationId,
-    created_at: 'Mon Jul 13 00:00:00 +0000 2026',
+    inReplyTo,
-    reply_count: replyCount,
+    replyCount,
-    retweet_count: 2,
+  }),
-    favorite_count: 3,
-    conversation_id_str: conversationId,
-    ...(inReplyTo ? { in_reply_to_status_id_str: inReplyTo } : {}),
-  },
   core: {
     user_results: {
       result: {

orval.config.ts

@@ -0,0 +1,75 @@
+import { defineConfig, defineTransformer } from 'orval'
+
+const selectedTag = 'twitter-lite-e2e'
+const selectedOperationIds = new Set([
+  'getUserByScreenName',
+  'getUserTweets',
+  'getTweetDetail',
+  'getSearchTimeline',
+  'getListLatestTweetsTimeline',
+])
+
+const selectE2eOperations = defineTransformer((document) => {
+  const foundOperationIds = new Set<string>()
+
+  for (const pathItem of Object.values(document.paths ?? {})) {
+    if (!pathItem || typeof pathItem !== 'object') continue
+
+    for (const candidate of Object.values(pathItem)) {
+      if (
+        !candidate ||
+        typeof candidate !== 'object' ||
+        Array.isArray(candidate) ||
+        !('operationId' in candidate)
+      ) {
+        continue
+      }
+
+      const operation = candidate as {
+        operationId?: string
+        tags?: string[]
+      }
+
+      if (
+        operation.operationId &&
+        selectedOperationIds.has(operation.operationId)
+      ) {
+        foundOperationIds.add(operation.operationId)
+        operation.tags = [...(operation.tags ?? []), selectedTag]
+      }
+    }
+  }
+
+  const missingOperationIds = [...selectedOperationIds].filter(
+    (operationId) => !foundOperationIds.has(operationId),
+  )
+  if (missingOperationIds.length > 0) {
+    throw new Error(
+      `twitter-openapi is missing selected operations: ${missingOperationIds.join(', ')}`,
+    )
+  }
+
+  return document
+})
+
+export default defineConfig({
+  twitterOpenApi: {
+    input: {
+      target:
+        'https://raw.githubusercontent.com/fa0311/twitter-openapi/590dae5c9f8575abc91d3774946bfe6f23960aba/dist/docs/openapi-3.0.yaml',
+      filters: {
+        mode: 'include',
+        tags: [selectedTag],
+      },
+      override: {
+        transformer: selectE2eOperations,
+      },
+    },
+    output: {
+      clean: true,
+      client: 'fetch',
+      mode: 'single',
+      target: './e2e/generated/twitter-openapi/client.ts',
+    },
+  },
+})

package.json

@@ -6,12 +6,18 @@
   "engines": {
     "node": ">=22.12.0"
   },
+  "knip": {
+    "ignore": [
+      "e2e/generated/**"
+    ]
+  },
   "imports": {
     "#/*": "./src/*"
   },
   "scripts": {
     "dev": "vite dev --host 127.0.0.1 --port 3000",
     "dev:tailscale": "vite dev --host 0.0.0.0 --port 3000",
+    "generate:e2e-openapi": "orval --config orval.config.ts --formatter biome --fail-on-warnings",
     "generate-routes": "node scripts/generate-routes.mjs",
     "check:routes": "pnpm generate-routes && git diff --exit-code -- src/routeTree.gen.ts",
     "build": "vite build",
@@ -49,6 +55,8 @@
     "@vitejs/plugin-react": "6.0.3",
     "jsdom": "29.1.1",
     "knip": "6.27.0",
+    "orval": "8.24.0",
+    "tsx": "4.23.12",
     "typescript": "7.0.2",
     "vite": "8.1.4",
     "vitest": "4.1.10"

playwright.config.ts

@@ -22,7 +22,7 @@ export default defineConfig({
   },
   webServer: [
     {
-      command: `TWITTER_LITE_MOCK_RELAY_PORT=${relayPort} node e2e/mock-relay.mjs`,
+      command: `TWITTER_LITE_MOCK_RELAY_PORT=${relayPort} pnpm exec tsx e2e/mock-relay.mjs`,
       port: relayPort,
       reuseExistingServer: false,
       timeout: 120_000,