✨ add vue-router-app sample and E2E tests

[mormubis]

Motivation

Fifth and final PR (#4325, #4327, #4328, #4330 are the first four). Adds a Vite sample app and E2E tests that verify all three features of the integration work end-to-end in a real browser.

Changes

`test/apps/vue-router-app` is a Vue 3 SPA wiring up `vuePlugin`, `addVueError`, `createRouter` from `vue-router-v4`, and `UNSTABLE_useVueComponentTracker` together.

The app reads RUM config from URL query params (`?rum-config=...`) so the E2E framework can inject it at test time — same pattern as `nextjs-app-router`.

`test/e2e/scenario/vuePlugin.scenario.ts` covers the three features:

• view names are parameterized (`/user/:id` not `/user/42`)
• errors are captured with `context.framework: "vue"`
• component render vitals are emitted for tracked components

The E2E framework gets a `withVueApp()` helper (mirrors `withNextjsApp()`) and a Vite web server entry in `playwright.base.config.ts`.

Test instructions

```bash
yarn test:e2e:init
yarn test:e2e -g "vue plugin"
```

Checklist

• Tested locally
• Tested on staging
• Added unit tests (sample app, no unit tests needed)
• Added e2e/integration tests
• Updated documentation

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	N/A	175.02 KiB	N/A	N/A	N/A
Rum Profiler	N/A	6.16 KiB	N/A	N/A	N/A
Rum Recorder	N/A	27.46 KiB	N/A	N/A	N/A
Logs	N/A	56.80 KiB	N/A	N/A	N/A
Rum Slim	N/A	130.66 KiB	N/A	N/A	N/A
Worker	N/A	23.63 KiB	N/A	N/A	N/A

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.0042	0.0044	+4.76%
RUM - add action	0.0138	0.0147	+6.52%
RUM - add error	0.0136	0.015	+10.29%
RUM - add timing	0.0029	0.0031	+6.90%
RUM - start view	0.0128	0.0143	+11.72%
RUM - start/stop session replay recording	0.0008	0.0009	+12.50%
Logs - log message	0.0169	0.018	+6.51%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	26.71 KiB	26.54 KiB	-173 B
RUM - add action	51.49 KiB	50.52 KiB	-996 B
RUM - add timing	26.85 KiB	26.84 KiB	-13 B
RUM - add error	54.98 KiB	54.69 KiB	-299 B
RUM - start/stop session replay recording	26.03 KiB	25.22 KiB	-833 B
RUM - start view	465.58 KiB	462.91 KiB	-2.67 KiB
Logs - log message	44.51 KiB	46.24 KiB	+1.73 KiB

🔗 RealWorld

[datadog-prod-us1-6]

⚠️ Tests

✨ Fix all issues with BitsAI or with Cursor

⚠️ Warnings

🧪 2 Tests failed

UNSTABLE_useVueComponentTracker reports a vueComponentRender vital on mount from Chrome 63.0.3239.84 (Windows 10) (Datadog) (Fix with Cursor)

TypeError: Object.fromEntries is not a function
    at getComponentsFromStubs (webpack:///node_modules/@vue/test-utils/dist/vue-test-utils.esm-bundler.mjs:290:1 <- /tmp/_karma_webpack_494305/commons.js:140285:19)
    at createInstance (webpack:///node_modules/@vue/test-utils/dist/vue-test-utils.esm-bundler.mjs:8305:1 <- /tmp/_karma_webpack_494305/commons.js:148300:24)
    at mount (webpack:///node_modules/@vue/test-utils/dist/vue-test-utils.esm-bundler.mjs:8365:1 <- /tmp/_karma_webpack_494305/commons.js:148360:14)
    at UserContext.it (webpack:///packages/rum-vue/src/domain/performance/useVueComponentTracker.spec.ts:27:16 <- /tmp/_karma_webpack_494305/commons.js:113282:69)
    at <Jasmine>

UNSTABLE_useVueComponentTracker reports is_first_render: false on update from Chrome 63.0.3239.84 (Windows 10) (Datadog) (Fix with Cursor)

TypeError: Object.fromEntries is not a function
    at getComponentsFromStubs (webpack:///node_modules/@vue/test-utils/dist/vue-test-utils.esm-bundler.mjs:290:1 <- /tmp/_karma_webpack_494305/commons.js:140285:19)
    at createInstance (webpack:///node_modules/@vue/test-utils/dist/vue-test-utils.esm-bundler.mjs:8305:1 <- /tmp/_karma_webpack_494305/commons.js:148300:24)
    at mount (webpack:///node_modules/@vue/test-utils/dist/vue-test-utils.esm-bundler.mjs:8365:1 <- /tmp/_karma_webpack_494305/commons.js:148360:14)
    at UserContext.it (webpack:///packages/rum-vue/src/domain/performance/useVueComponentTracker.spec.ts:58:32 <- /tmp/_karma_webpack_494305/commons.js:113309:85)
    at <Jasmine>

ℹ️ Info

No other issues found (see more)

❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 77.32% (+0.01%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 18d8e7c | Docs | Datadog PR Page | Was this helpful? React with 👍/👎 or give us feedback!}