👷 Ensure test apps use peerDependencies for @datadog/* packages

[thomas-lebeau]

Motivation

Test apps that list @datadog/* packages in dependencies cause yarn install to resolve them from the registry instead of using local workspace versions. This leads to dirty git trees after building (updated lockfiles, unexpected resolutions) and makes builds non-reproducible. The convention is to use peerDependencies so local packages are only installed at build time via build-test-apps.

see also: #4387

Changes

• Add a check-packages rule that enforces peerDependencies for @datadog/* packages in test apps.
• Migrate nuxt-app from dependencies to peerDependencies for @datadog/* packages.

Test instructions

1. Run yarn node scripts/check-packages.ts — should pass.
2. Add a @datadog/* package to dependencies in any test app's package.json — check-packages should fail with a clear error.
3. Run yarn build:apps --app nuxt-app — should not leave the directory dirty.

Checklist

• Tested locally
• Tested on staging
• Added unit tests for this change.
• Added e2e/integration tests for this change.
• Updated documentation and/or relevant AGENTS.md file

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	178.84 KiB	178.84 KiB	0 B	0.00%	✅
Rum Profiler	6.16 KiB	6.16 KiB	0 B	0.00%	✅
Rum Recorder	27.03 KiB	27.03 KiB	0 B	0.00%	✅
Logs	56.36 KiB	56.36 KiB	0 B	0.00%	✅
Rum Slim	134.70 KiB	134.70 KiB	0 B	0.00%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.0041	0.004	-2.44%
RUM - add action	0.0135	0.0129	-4.44%
RUM - add error	0.0131	0.0124	-5.34%
RUM - add timing	0.0032	0.0025	-21.88%
RUM - start view	0.0136	0.0131	-3.68%
RUM - start/stop session replay recording	0.0008	0.0007	-12.50%
Logs - log message	0.0167	0.015	-10.18%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	31.72 KiB	30.83 KiB	-909 B
RUM - add action	102.50 KiB	86.12 KiB	-16.37 KiB
RUM - add timing	32.67 KiB	33.16 KiB	+509 B
RUM - add error	106.81 KiB	94.09 KiB	-12.72 KiB
RUM - start/stop session replay recording	32.50 KiB	31.73 KiB	-789 B
RUM - start view	482.63 KiB	488.68 KiB	+6.05 KiB
Logs - log message	101.45 KiB	103.37 KiB	+1.92 KiB

🔗 RealWorld

[datadog-datadog-prod-us1-2]

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 77.01% (-0.01%)

_{This comment will be updated automatically if new data arrives.
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[bcaudan]

LGTM