✨ Add @datadog/browser-remote-config standalone package

[mormubis]

Motivation

Customers using SSI (Server-Side Instrumentation) need to fetch remote configuration independently of the RUM SDK, at build time or server-side. This package provides that capability as a standalone, lightweight module.

Changes

New package: @datadog/browser-remote-config

• fetchRemoteConfiguration(options) — fetch remote config with 30s timeout
• RemoteConfigResult — discriminated union ({ ok: true; value } | { ok: false; error }) for safe TypeScript narrowing without non-null assertions
• AbortSignal support — pass a signal for cancellation (e.g. AbortSignal.timeout(30_000))
• Dynamic value resolution — cookies ($cookie:name), DOM selectors ($dom:selector), JS paths ($js:path)
• Uses buildSiteHost from @datadog/browser-core (PR1) — no type-assertion hack

Purely additive

rum-core's existing remoteConfigurationId init option is untouched. This PR only adds the new package.

Testing

yarn test:unit --spec packages/remote-config/src/remoteConfiguration.spec.ts
yarn test:unit --spec packages/remote-config/src/jsonPathParser.spec.ts
yarn typecheck

---

Part of SSI Phase 6 stacked PRs. Stacks on: ♻️ Extract buildSiteHost (#4238). Next: @datadog/browser-sdk-endpoint package.

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	N/A	172.30 KiB	N/A	N/A	N/A
Rum Profiler	N/A	4.71 KiB	N/A	N/A	N/A
Rum Recorder	N/A	24.88 KiB	N/A	N/A	N/A
Logs	N/A	56.30 KiB	N/A	N/A	N/A
Flagging	N/A	944 B	N/A	N/A	N/A
Rum Slim	N/A	128.07 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%
addglobalcontext	N/A	0.0043	N/A
addaction	N/A	0.015	N/A
adderror	N/A	0.0135	N/A
addtiming	N/A	0.003	N/A
startview	N/A	0.0145	N/A
startstopsessionreplayrecording	N/A	0.0007	N/A
logmessage	N/A	0.0158	N/A

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
addglobalcontext	N/A	27.38 KiB	N/A
addaction	N/A	115.83 KiB	N/A
addtiming	N/A	26.63 KiB	N/A
adderror	N/A	116.61 KiB	N/A
startstopsessionreplayrecording	N/A	25.94 KiB	N/A
startview	N/A	502.27 KiB	N/A
logmessage	N/A	45.25 KiB	N/A

🔗 RealWorld

[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 75.58%
• Overall Coverage: 77.16%

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