PostHog/posthog-js @posthog/types@1.398.0

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1.398.0

Minor Changes

• #4222 0f2407b Thanks @turnipdabeets! - feat: add a default-value option to isFeatureEnabled

  isFeatureEnabled(key, { defaultValue: false }) now returns the given default when the flag has no value — flags not loaded yet, or no flag with that key — and the return type narrows to boolean. The option name is the same in posthog-js, posthog-js-lite, and posthog-react-native. Without defaultValue, behavior is unchanged: boolean | undefined. (2026-07-22)