✨ 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	173.88 KiB	173.96 KiB	+76 B	+0.04%	✅
Rum Profiler	7.89 KiB	7.89 KiB	0 B	0.00%	✅
Rum Recorder	21.21 KiB	21.21 KiB	0 B	0.00%	✅
Logs	55.69 KiB	55.69 KiB	0 B	0.00%	✅
Rum Slim	131.63 KiB	131.70 KiB	+76 B	+0.06%	✅
Worker	22.99 KiB	22.99 KiB	0 B	0.00%	✅

🔗 RealWorld

[datadog-datadog-prod-us1]

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⚠️ Warnings

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