v5.4.0: 💎 Version 5.4.0

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🚀 Major Changes

Build System Modernization

• Complete tooling overhaul: Migrated from Rollup + Webpack + Babel to Vite for faster builds and better developer experience
• Testing modernization: Transitioned from Jest to Vitest for improved performance and native ESM support
• Removed SVG.js dependency: Replaced with a custom lightweight SVG utility, reducing bundle size and external dependencies

Performance Improvements

• Optimized object cloning - Significantly improved performance for data processing
• DOM query caching - Reduced redundant DOM lookups for better rendering performance
• Event delegation - Implemented event delegation pattern to improve event handling performance
• Treemap optimization - Enhanced Treemap-squared.js algorithm for better performance

🐛 Bug Fixes

• Fixed y-axis title getting cut off when using formatter (#​5152)
• Fixed annotation rectangles drifting when browser zoom level is not 100%
• Fixed x-axis label repetition for very small numeric values (#​5127)
• Fixed bar chart top rounding issues
• Fixed area chart fill color when using CSS variables
• Fixed shared tooltip showing invisible series
• Fixed stack-column-outline chart rendering issues
• Removed obsolete polyfills from all samples
• Converted Treemap to proper ES module export
• Created ChartFactory for future tree-shaking support
• Legend font-size now supports units other than pixels (rem, vh, etc.) (#​5151)

Refactoring & Code Quality

• Refactored data handling architecture
• Applied code quality improvements across the codebase
• Improved unit test coverage across utility functions, datetime, and data processing modules

Testing Improvements

• Comprehensive unit test improvements across the library
• Enhanced E2E testing infrastructure
• Updated sample charts

💝 Contributors

Thank you to all contributors:

• @​meronz - Annotation zoom fix
• @​ptrgast - Greek locale improvements
• @​unki - Legend font-size units fix
• @​ZahidChandio - Multiple chart fixes