PostHog/posthog-js posthog-node@5.21.0

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5.21.0

Minor Changes

• #2883 640fcdd Thanks @ordehi! - Add warning when experience continuity flags are detected during local evaluation, and new strictLocalEvaluation option.

  Warning: When using local evaluation with flags that have experience continuity enabled, a warning is now emitted explaining that these flags will cause server requests on every evaluation, negating local evaluation cost savings.

  New option: strictLocalEvaluation: true can be set at client init to prevent all server fallback for flag evaluations. Flags that cannot be evaluated locally will return undefined instead of making a server request. This is useful in high-volume environments where you want to guarantee no unexpected server costs. (2026-01-14)