feat(flags): Adds Growthbook integration

[madhuchavva]

Adds GrowthBook's integration for tracking feature evaluations.

This PR includes changes to wrap isOn, getFeatureValue and evalFeature methods, record results of type (booleans, strings, numbers, null, objects/arrays) and attach them to active span or current scope buffer for errors.

Closes https://linear.app/getsentry/issue/REPLAY-728/add-growthbook-feature-flag-integrations

---

Note

Adds GrowthBook integration that captures boolean feature evaluations via isOn/getFeatureValue to spans and error events, and exports it across SDKs with browser/node tests.

• Core:
  • New growthbookIntegration: Wraps isOn/getFeatureValue to capture boolean results; inserts into active span attributes and copies to error events via scope.
  • Exposed from @sentry/core feature flags exports.
• Runtimes/Frameworks:
  • Browser/Node: Add runtime adapter/shim and re-export growthbookIntegration.
  • SDK re-exports: Astro, AWS Serverless, Bun, Cloudflare, Google Cloud Serverless, Next.js (types), Nuxt (types), Remix (types), React Router (types), SolidStart (types), SvelteKit (types), TanStack Start (types) now expose growthbookIntegration.
• Tests:
  • Browser integration tests: onError (buffer eviction, updates, boolean-only capture, scope isolation) and onSpan (attributes on span end, per-span cap).
  • Node integration tests: Scenarios validating onError and onSpan; add @growthbook/growthbook test dependency.

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[madhuchavva]

@Lms24 Would you approve the workflows to run again?

[aliu39]

Tysm for the integration @madhuchavva !! Will take a look soon

record results of type (booleans, strings, numbers, null, objects/arrays)

For now Sentry is limiting all FF integrations to boolean only. We plan to rollout non-bool support later - would you mind removing those types from this PR?

[aliu39]

relates to getsentry/sentry#82157

[aliu39]

Changes lgtm but could use a review from the js experts for safety! I'm fine with node support getting added in a followup

@AbhiPrasad @chargome

[madhuchavva]

@chargome @aliu39 Thanks for the feedback. Apologies for the delay in getting back(I was off). Please take a look when you can. Thank you!

[aliu39]

Thanks sm for the updates! Just approved tests to run. For server-side, I believe there are a few more pkgs to export from besides node. See https://github.com/getsentry/sentry-javascript/pull/16585/files as a reference -

To verify it works for node, could we copy tests to dev-packages/node-integration-tests/ as well?

[madhuchavva]

@AbhiPrasad do you mind taking a look at this?

[chargome]

@madhuchavva once we fix CI: Build & Test / Lint we're good to go

[madhuchavva]

@aliu39 do you mind giving the approval to let the workflows run?

[madhuchavva]

@madhuchavva once we fix CI: Build & Test / Lint we're good to go

@chargome Lint check is fixed now. Do you mind taking a look?

[madhuchavva]

@aliu39 had to click on "update branch" to get it out of sync. Mind approving the workflows to run?

@chargome Appreciate if you could review this PR one last time. Thank you!