@flags-sdk/posthog: upgrade posthog-node; explicit evaluation modes#436
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dferber90 wants to merge 8 commits into
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@flags-sdk/posthog: upgrade posthog-node; explicit evaluation modes#436dferber90 wants to merge 8 commits into
dferber90 wants to merge 8 commits into
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The default adapter passed POSTHOG_PERSONAL_API_KEY into the runtime posthog-node client, which enabled local evaluation and started a feature-flag poller in every warm process. On serverless this produced large, traffic-independent PostHog feature flag request volume. Local evaluation is now opt-in via POSTHOG_SECRET_KEY; without it the adapter evaluates remotely. POSTHOG_PERSONAL_API_KEY is used only by getProviderData (Flags Explorer) and no longer affects runtime evaluation. Drops the forced 10s poll interval in favor of the v5 default. Updates docs, README, and tests.
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dferber90
marked this pull request as ready for review
July 21, 2026 06:22
vincent-derks
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vincent-derks
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Found some issues:
- 5.45.0 has
"engines": { "node": "^20.20.0 || >=22.22.0" }. It used to support>=15. Quite the jump. Should we at least document that? Or maybe also define an engines field mirroring that inpackages/adapter-posthog/package.json? - 5.45.0 has deprecated
isFeatureEnabled,getFeatureFlag, andgetFeatureFlagPayloadin favor ofevaluateFlags. I think this might spam some deprecation warnings now. Should we also migrate toevaluateFlags? Since it's already a major update, that might fit.
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Maybe we should also remove this
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The default adapter passed POSTHOG_PERSONAL_API_KEY into the runtime
posthog-node client, which enabled local evaluation and started a
feature-flag poller in every warm process. On serverless this produced
large, traffic-independent PostHog feature flag request volume.
Local evaluation is now opt-in via POSTHOG_SECRET_KEY; without it the
adapter evaluates remotely. POSTHOG_PERSONAL_API_KEY is used only by
getProviderData (Flags Explorer) and no longer affects runtime
evaluation. Drops the forced 10s poll interval in favor of the v5
default. Updates docs, README, and tests.
closes #393