Worked on improving survey reliability in the PostHog/posthog-js repository by addressing issues with event-triggered survey rendering. Focused on ensuring that surveys gated by specific events or actions would not appear until the appropriate trigger occurred, aligning backend eligibility checks with frontend UI logic. Introduced a checkSurveyRenderability wrapper to factor trigger state into survey eligibility, and fixed a bug where event-gated surveys were incorrectly reported as renderable before the trigger fired. Added regression tests to verify that manual display calls remained functional. Utilized React, TypeScript, and Jest to implement and validate these changes, emphasizing robust frontend development and unit testing.