April 2026 monthly summary focusing on key accomplishments, major bug fixes, and business impact across two repos (plotly/plotly.js and plotly/dash). The work emphasizes reliability, correctness, and test coverage to reduce customer-visible issues and improve maintainability. Key features delivered and major bugs fixed: - plotly.js: Fixed axis orientation reversal when clamping with minallowed/maxallowed; regression tests added for all minallowed/maxallowed edge cases; image baselines regenerated to reflect correct axis rendering order after the fix. - plotly/dash: MATCH inputs enhancements with relaxed validation and per-trigger resolvedId handling; expanded tests and changelog entry to document improved MATCH semantics and validation. - Test infrastructure: Refactored MATCH test code for readability and style (Black and Prettier) to improve maintainability and consistency across tests. Overall impact and accomplishments: - Improved rendering reliability and axis behavior in Plotly charts, reducing customer-visible glitches when clamping or configuring ranges. - Strengthened callback matching semantics in Dash, preventing deduplication issues and enabling more flexible, correct MATCH usage. - Increased test coverage and maintainability with standardized tooling and baselines, positioning the project for faster, safer iteration. Technologies/skills demonstrated: - JavaScript/TypeScript, Python, Dash (React + Python backend), test frameworks (Mocha/Chai, pytest), and image baseline workflows using Kaleido. - Regression testing, changelog/documentation discipline, and cross-repo collaboration (co-authored commits).