bokeh/bokeh
Oct 2024 – Sep 2025
12 Months active
Languages Used
BashJavaScriptLessPythonTypeScriptYAMLCSSRST
Technical Skills
BokehJSBuild AutomationCI/CDCSSCanvas APIComponent Design
Mateusz Paprocki
PROFILE
Mateusz Paprocki
Over the past year, Matt Paprocki delivered robust engineering solutions for the bokeh/bokeh repository, building and refining interactive data visualization features and developer tooling. He implemented enhancements such as advanced HoverTool filtering, named legend support, and responsive layout fixes, using TypeScript, Python, and CSS to improve rendering fidelity and user experience. Matt strengthened type safety with static typing and upgraded the codebase to newer TypeScript versions, while also modernizing CI/CD workflows for reliability. His work addressed complex issues like serialization of self-referential data and template parsing, demonstrating depth in both frontend and backend development and resulting in a more maintainable, stable platform.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
81Total
Bugs
18
Commits
81
Features
44
Lines of code
29,088
Activity Months12
Your Network
17 people
Work History
September 2025
1 Commits
Sep 1, 2025September 2025: Stabilized and hardened the templating engine in the bokeh/bokeh repo. Restored support for the @$name placeholder and refactored the replace_placeholders regex to robustly parse and process various placeholder formats, including those with curly braces and optional formatting. This targeted fix improves correctness and flexibility of dynamic content rendering, reducing edge-case failures and enhancing template reliability for users. Implemented in the commit db2574a8ca19eb4f2c9911b1a3c6757aac908a0d (Restore @$name support and improve replace_placeholders() (#14652)).
1 Commits
Sep 1, 2025September 2025: Stabilized and hardened the templating engine in the bokeh/bokeh repo. Restored support for the @$name placeholder and refactored the replace_placeholders regex to robustly parse and process various placeholder formats, including those with curly braces and optional formatting. This targeted fix improves correctness and flexibility of dynamic content rendering, reducing edge-case failures and enhancing template reliability for users. Implemented in the commit db2574a8ca19eb4f2c9911b1a3c6757aac908a0d (Restore @$name support and improve replace_placeholders() (#14652)).
September 2025
August 2025
10 Commits • 7 Features
Aug 1, 2025August 2025 — Focused on extending plotting capabilities, strengthening type safety, and improving user experience across Bokeh. Key deliveries included: - Named legend support for the glyph API (legend_name) with accompanying unit tests and examples. - TypeScript 5.9 upgrade with type-safety improvements across arrays, text contexts, and custom meta typings. - User-facing connection status notifications in BokehJS, enabling visibility of ConnectionLost and ClientReconnected events and an option to disable global notifications. - SizeBar annotation for radial sizing, plus side-panel layout support to broaden plotting expressiveness; and related export capabilities for non-renderer elements (inner plots and SizeBar instances). - DocumentConfig model for document-level configuration, centralizing session management, reconnection behavior, and notification settings. - Notable reliability improvement: prevention of unnecessary session reconnect attempts on page reload to reduce spurious user notifications and UX churn.
August 2025
10 Commits • 7 Features
Aug 1, 2025August 2025 — Focused on extending plotting capabilities, strengthening type safety, and improving user experience across Bokeh. Key deliveries included: - Named legend support for the glyph API (legend_name) with accompanying unit tests and examples. - TypeScript 5.9 upgrade with type-safety improvements across arrays, text contexts, and custom meta typings. - User-facing connection status notifications in BokehJS, enabling visibility of ConnectionLost and ClientReconnected events and an option to disable global notifications. - SizeBar annotation for radial sizing, plus side-panel layout support to broaden plotting expressiveness; and related export capabilities for non-renderer elements (inner plots and SizeBar instances). - DocumentConfig model for document-level configuration, centralizing session management, reconnection behavior, and notification settings. - Notable reliability improvement: prevention of unnecessary session reconnect attempts on page reload to reduce spurious user notifications and UX churn.
July 2025
8 Commits • 3 Features
Jul 1, 2025July 2025 delivery focused on reliability, performance, and developer productivity for Bokeh visualizations. Key features shipped, critical stability fixes, and hardened test/security posture to enable safer, faster iteration by product teams and users. Key features delivered and business value: - HoverTool enhancements: advanced filtering, sorting, and limiting; tooltip rendering refactor; build system updates to support new grammar files. Improves end-user data exploration and dashboard responsiveness with richer, faster tooltips. Commit e9890f0fbc8bf4fe386f3c73cd02de0e3f9468c1. - Color and property type enhancements: support for unsigned integer (uint) color values and BoolSpec property type with validation improvements to prevent booleans in numeric properties. Improves data integrity and rendering fidelity. Commit bc1bec3117d73014cfe3e64a9c9ec6415509337a. - RangeTool stability fix: ensure range updates propagate even when no linked plots are affected; updated ranges directly on the range object; added regression tests. Improves reliability for time-series analysis and cross-plot consistency. Commit 282f47ca7fb59d3f63cb17e6bc0756d8ddfa683c. - Flex layout responsive fix: apply min-width: 0 and min-height: 0 to responsive children in flex containers to prevent shrinking overflow and ensure layouts render correctly across devices. Commit 0c387f2dc37b81adf9c3369e99963e8457aaeae9. - Stability, security, and test infrastructure improvements: robust test infrastructure, additional OSM test assets, npm audit remediation, improved BitSet utilities and error handling; upgrades to test dependencies (mypy/ruff) for safer indexing and error detection. Includes robust tests around RuntimeError and OSM tests. Commits d8e81f2fb776858c752e9676576f3557bd73e4ac, a9d5bdc9de717425a446749ac90c53f95341bf9e, 3a361080604d6c97f41cf85001161ce7a788f52d, 852b649362a483146d203143c03c36a5cf9e698f.
8 Commits • 3 Features
Jul 1, 2025July 2025 delivery focused on reliability, performance, and developer productivity for Bokeh visualizations. Key features shipped, critical stability fixes, and hardened test/security posture to enable safer, faster iteration by product teams and users. Key features delivered and business value: - HoverTool enhancements: advanced filtering, sorting, and limiting; tooltip rendering refactor; build system updates to support new grammar files. Improves end-user data exploration and dashboard responsiveness with richer, faster tooltips. Commit e9890f0fbc8bf4fe386f3c73cd02de0e3f9468c1. - Color and property type enhancements: support for unsigned integer (uint) color values and BoolSpec property type with validation improvements to prevent booleans in numeric properties. Improves data integrity and rendering fidelity. Commit bc1bec3117d73014cfe3e64a9c9ec6415509337a. - RangeTool stability fix: ensure range updates propagate even when no linked plots are affected; updated ranges directly on the range object; added regression tests. Improves reliability for time-series analysis and cross-plot consistency. Commit 282f47ca7fb59d3f63cb17e6bc0756d8ddfa683c. - Flex layout responsive fix: apply min-width: 0 and min-height: 0 to responsive children in flex containers to prevent shrinking overflow and ensure layouts render correctly across devices. Commit 0c387f2dc37b81adf9c3369e99963e8457aaeae9. - Stability, security, and test infrastructure improvements: robust test infrastructure, additional OSM test assets, npm audit remediation, improved BitSet utilities and error handling; upgrades to test dependencies (mypy/ruff) for safer indexing and error detection. Includes robust tests around RuntimeError and OSM tests. Commits d8e81f2fb776858c752e9676576f3557bd73e4ac, a9d5bdc9de717425a446749ac90c53f95341bf9e, 3a361080604d6c97f41cf85001161ce7a788f52d, 852b649362a483146d203143c03c36a5cf9e698f.
July 2025
June 2025
2 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for bokeh/bokeh focusing on developer productivity and stability. Delivered two targeted improvements that reduce disruption during development and improve debugging of complex data structures: (1) Duplicate Model Definitions now warn instead of error, reducing disruption when redefining models; (2) Added a temporary check_circular flag to the Serializer to bypass circular reference checks for debugging complex self-referential data structures. These changes enhance iteration speed, preserve backward compatibility where feasible, and provide clearer diagnostics for complex data relationships. Overall, the work improved developer experience, reduced debugging time, and contributed to more robust model handling in day-to-day workflows.
June 2025
2 Commits • 2 Features
Jun 1, 2025June 2025 monthly summary for bokeh/bokeh focusing on developer productivity and stability. Delivered two targeted improvements that reduce disruption during development and improve debugging of complex data structures: (1) Duplicate Model Definitions now warn instead of error, reducing disruption when redefining models; (2) Added a temporary check_circular flag to the Serializer to bypass circular reference checks for debugging complex self-referential data structures. These changes enhance iteration speed, preserve backward compatibility where feasible, and provide clearer diagnostics for complex data relationships. Overall, the work improved developer experience, reduced debugging time, and contributed to more robust model handling in day-to-day workflows.
May 2025
3 Commits • 2 Features
May 1, 2025May 2025 monthly summary for bokeh/bokeh focusing on delivering robust plot rendering, improved date formatting, and code quality improvements that reduce runtime errors and maintenance costs. Highlights include major layout/rendering enhancements for plots, improved handling of non-finite datetimes, and a clean-up that reduces technical debt in the BokehTornado path; together these efforts improve reliability of dashboards and developer experience across the codebase.
3 Commits • 2 Features
May 1, 2025May 2025 monthly summary for bokeh/bokeh focusing on delivering robust plot rendering, improved date formatting, and code quality improvements that reduce runtime errors and maintenance costs. Highlights include major layout/rendering enhancements for plots, improved handling of non-finite datetimes, and a clean-up that reduces technical debt in the BokehTornado path; together these efforts improve reliability of dashboards and developer experience across the codebase.
May 2025
April 2025
4 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for bokeh/bokeh: delivered targeted fixes to rendering correctness on high-DPI displays, improved rendering performance for image-like glyphs, and enhanced static typing for splattable figure attributes. These changes reduce visual inconsistencies, boost rendering throughput, and improve developer experience with stronger type safety and regression coverage.
April 2025
4 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for bokeh/bokeh: delivered targeted fixes to rendering correctness on high-DPI displays, improved rendering performance for image-like glyphs, and enhanced static typing for splattable figure attributes. These changes reduce visual inconsistencies, boost rendering throughput, and improve developer experience with stronger type safety and regression coverage.
March 2025
9 Commits • 6 Features
Mar 1, 2025Summary for 2025-03: This month focused on increasing bokeh/bokeh's compatibility, reliability, and developer experience across Python 3.10 and UI behavior. Key work included tightening Python 3.10 compatibility and CI alignment, auto-activating WheelZoomTool on focus to improve accessibility, hardening renderers against empty data sources with tests, stabilizing document detachment with null checks and recomputation timeout, and preserving parent layout styles to avoid regressions in UI rendering. Release metadata and 3.7.0 notes were updated to reflect new features and UI changes, supporting smoother user onboarding and release readiness. These efforts reduce runtime issues for users, improve test reliability, and streamline ongoing development.
9 Commits • 6 Features
Mar 1, 2025Summary for 2025-03: This month focused on increasing bokeh/bokeh's compatibility, reliability, and developer experience across Python 3.10 and UI behavior. Key work included tightening Python 3.10 compatibility and CI alignment, auto-activating WheelZoomTool on focus to improve accessibility, hardening renderers against empty data sources with tests, stabilizing document detachment with null checks and recomputation timeout, and preserving parent layout styles to avoid regressions in UI rendering. Release metadata and 3.7.0 notes were updated to reflect new features and UI changes, supporting smoother user onboarding and release readiness. These efforts reduce runtime issues for users, improve test reliability, and streamline ongoing development.
March 2025
February 2025
23 Commits • 11 Features
Feb 1, 2025February 2025 monthly summary focusing on delivering business-value features, performance improvements, UX enhancements, and modernization of the development pipeline across the bokeh/bokeh repository.
February 2025
23 Commits • 11 Features
Feb 1, 2025February 2025 monthly summary focusing on delivering business-value features, performance improvements, UX enhancements, and modernization of the development pipeline across the bokeh/bokeh repository.
January 2025
5 Commits • 2 Features
Jan 1, 2025January 2025 monthly summary for bokeh/bokeh. Focused on code quality, rendering fidelity, UX improvements, and documentation reliability. Delivered: typing enhancements and static-analysis readiness in plotting._renderer with support for manually generated stub files and CSS4-to-CSS3 color parsing in the SVG backend; context menu to access plot tools for improved interaction; fixed documentation link in first_steps_7.rst to ensure tutorial resources are accessible. Overall impact: increased maintainability, more predictable rendering, and smoother onboarding for contributors and users. Technologies demonstrated include Python typing, static analysis readiness, SVG rendering nuances, and UX/UI improvements.
5 Commits • 2 Features
Jan 1, 2025January 2025 monthly summary for bokeh/bokeh. Focused on code quality, rendering fidelity, UX improvements, and documentation reliability. Delivered: typing enhancements and static-analysis readiness in plotting._renderer with support for manually generated stub files and CSS4-to-CSS3 color parsing in the SVG backend; context menu to access plot tools for improved interaction; fixed documentation link in first_steps_7.rst to ensure tutorial resources are accessible. Overall impact: increased maintainability, more predictable rendering, and smoother onboarding for contributors and users. Technologies demonstrated include Python typing, static analysis readiness, SVG rendering nuances, and UX/UI improvements.
January 2025
December 2024
6 Commits • 3 Features
Dec 1, 2024December 2024 monthly summary for the bokeh/bokeh project. Focused on delivering interactive visualization enhancements, strengthening stability, and improving codebase consistency. Key deliverables include custom scatter markers with CustomJS support and WebGL-aware rendering optimizations, stateful action tools with gridplot interactivity, and targeted codebase cleanup including typos fixes and deprecation of a misspelled theme. Major reliability improvements include PaneView stability with an integration test for multiple TileRenderer instances and enhanced server startup error handling with clearer messages for port conflicts and unavailable addresses. These efforts reduce runtime errors, enable richer visualizations, and improve developer experience, aligning with business value by delivering robust, flexible, and maintainable visualization tooling.
December 2024
6 Commits • 3 Features
Dec 1, 2024December 2024 monthly summary for the bokeh/bokeh project. Focused on delivering interactive visualization enhancements, strengthening stability, and improving codebase consistency. Key deliverables include custom scatter markers with CustomJS support and WebGL-aware rendering optimizations, stateful action tools with gridplot interactivity, and targeted codebase cleanup including typos fixes and deprecation of a misspelled theme. Major reliability improvements include PaneView stability with an integration test for multiple TileRenderer instances and enhanced server startup error handling with clearer messages for port conflicts and unavailable addresses. These efforts reduce runtime errors, enable richer visualizations, and improve developer experience, aligning with business value by delivering robust, flexible, and maintainable visualization tooling.
November 2024
4 Commits • 2 Features
Nov 1, 2024November 2024 performance summary for bokeh/bokeh focused on stabilizing rendering, improving test quality metrics, and hardening CI/CD pipelines. Delivered three core items: (1) a bug fix for ScaleBar rendering with an accompanying integration test to prevent regression; (2) enhancements to the bokehjs test framework reporting, including progress indicators for selected tests and final failure counts, plus refactored test naming for clarity; (3) CI/CD stabilization and tooling upgrades including a TypeScript 5.7 upgrade and improved ArrayBufferLike handling, plus adjustments to GitHub Actions workflows for reliability. These efforts reduced visual/regression risk, improved developer productivity through better test analytics, and provided a more robust, scalable release pipeline. Business value achieved through higher-quality releases, faster diagnosis of failures, and more predictable CI behavior.
4 Commits • 2 Features
Nov 1, 2024November 2024 performance summary for bokeh/bokeh focused on stabilizing rendering, improving test quality metrics, and hardening CI/CD pipelines. Delivered three core items: (1) a bug fix for ScaleBar rendering with an accompanying integration test to prevent regression; (2) enhancements to the bokehjs test framework reporting, including progress indicators for selected tests and final failure counts, plus refactored test naming for clarity; (3) CI/CD stabilization and tooling upgrades including a TypeScript 5.7 upgrade and improved ArrayBufferLike handling, plus adjustments to GitHub Actions workflows for reliability. These efforts reduced visual/regression risk, improved developer productivity through better test analytics, and provided a more robust, scalable release pipeline. Business value achieved through higher-quality releases, faster diagnosis of failures, and more predictable CI behavior.
November 2024
October 2024
6 Commits • 4 Features
Oct 1, 2024October 2024: Delivered key features to improve touch interactions, data inspection, rendering fidelity, and CI reliability for bokeh/bokeh. Highlights include dynamic touch-action configuration for the plot toolbar, axis-triggered hover events for CrosshairTool and HoverTool, a dual canvas/DOM Legend rendering, viewport-aware repaint on DPR/viewport changes, and CI stability improvements (Linux-only tests and refined lock-threads workflow). These changes drive better mobile UX, precise data exploration, consistent visuals across devices, and faster, more reliable CI feedback.
October 2024
6 Commits • 4 Features
Oct 1, 2024October 2024: Delivered key features to improve touch interactions, data inspection, rendering fidelity, and CI reliability for bokeh/bokeh. Highlights include dynamic touch-action configuration for the plot toolbar, axis-triggered hover events for CrosshairTool and HoverTool, a dual canvas/DOM Legend rendering, viewport-aware repaint on DPR/viewport changes, and CI stability improvements (Linux-only tests and refined lock-threads workflow). These changes drive better mobile UX, precise data exploration, consistent visuals across devices, and faster, more reliable CI feedback.
Activity
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Quality Metrics
Correctness91.8%
Maintainability89.2%
Architecture86.6%
Performance80.6%
AI Usage20.4%
Skills & Technologies
Programming Languages
BashCSSHTMLJSONJavaScriptJinjaLessPythonRSTShell
Technical Skills
API DesignAPI RefactoringBackend DevelopmentBokehJSBuild AutomationBuild SystemsCI/CDCSSCSS PreprocessingCanvas APICode CleanupCode RefactoringColor ManipulationCommand Line InterfaceComponent Design
Repositories Contributed To
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