✨ Add @datadog/browser-sdk-endpoint package and CDN bundle generator CLI

[mormubis]

Motivation

Build tools (webpack, Vite, Node.js scripts) need a programmatic API to generate CDN bundles with embedded remote configuration. This PR adds that API as a published Node.js package, plus a CLI wrapper.

Changes

New package: @datadog/browser-sdk-endpoint

• generateBundle(options) — high-level async function with full input validation
• fetchConfig(options) — fetches remote config (delegates to @datadog/browser-remote-config)
• downloadSDK(options) — downloads SDK from Datadog CDN with in-memory caching (keyed by variant+datacenter; avoids re-fetching during watch mode)
• generateCombinedBundle(options) — low-level combinator: wraps SDK + config in an IIFE
• clearSdkCache() — test utility

CLI: scripts/build/generate-cdn-bundle.ts

generate-cdn-bundle --applicationId <id> --configId <id> --variant rum|rum-slim [--output file]

Infrastructure

• Excluded from Karma browser test runner (Node.js-only package)
• ESLint configured to disable browser-specific rules for Node.js files
• tsconfig.base.json path alias for @datadog/browser-sdk-endpoint

Testing

yarn test:script
yarn typecheck

---

Part of SSI Phase 6 stacked PRs. Stacks on: ✨ @datadog/browser-remote-config (#4239). Next: E2E tests.

[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	0.0041	N/A
addaction	N/A	0.0177	N/A
adderror	N/A	0.0148	N/A
addtiming	N/A	0.0033	N/A
startview	N/A	0.0159	N/A
startstopsessionreplayrecording	N/A	0.0007	N/A
logmessage	N/A	0.0164	N/A

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
addglobalcontext	N/A	26.20 KiB	N/A
addaction	N/A	113.50 KiB	N/A
addtiming	N/A	26.27 KiB	N/A
adderror	N/A	119.99 KiB	N/A
startstopsessionreplayrecording	N/A	25.85 KiB	N/A
startview	N/A	503.16 KiB	N/A
logmessage	N/A	45.41 KiB	N/A

🔗 RealWorld

[datadog-datadog-prod-us1-2]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 77.16% (+0.00%)

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