v4.0.0-rc.0

Added

• Add minscale, maxscale geo plot attributes [#7371], with thanks to @mojoaxel for the contribution!
• Enable TypeScript compatibility within the library and start exporting types [#7680]
• Add quiver trace type to visualize vector fields using arrows [#7710], with thanks to @degzhaus for the contribution!
• Use dashed markers in legend for shape traces with dash configured [#7845]
• Add sort option to Sankey links and nodes [#7873], with thanks to @adamreeve for the contribution!
• Add support for MathJax v4 [#7898]

Removed

• Breaking: Remove scattermapbox, choroplethmapbox, densitymapbox trace types, the mapbox subplot, and the mapboxAccessToken config option [#7860]
  • These traces have been deprecated since v3. Use the equivalent *map traces going forward.
• Breaking: Drop support for MathJax v2 [#7898]
  • MathJax v3 and v4 are now supported in plotly.js
• Remove config attributes showLink, linkText, sendData, showSources, and showEditInChartStudio, as well as trace attribute stream, since all of these were associated with Chart Studio and are no longer needed [#7812]
• Remove all *src attributes, as well as layout.hidesources attribute, from the schema [#7829]
• Remove internal trace._fullInput property and other dead code related to the removed transforms feature. No user-facing changes expected [#7834]

Changed

• Breaking: Switch color processing library from TinyColor to color [#7536]
  • rgb()/rgba() strings with decimal 0–1 fractions are no longer supported
  • hsv() color strings are no longer permitted
  • Color calculations may differ slightly (by a few RGB units)
  • New color formats are now supported: '#ff0000aa', '#f00a', 'rgb(255 0 0)', 'rgba(255 0 0 / 0.5)', 'hsl(0 100% 50% / 0.5)', 'hsla(0, 100%, 50%, 0.5)', 'hwb(0, 0%, 0%)'
• Breaking: Set default layout.axis.tickmode to 'sync' when axis is overlaying [#7684]
• Breaking: Change splom.axis.matches default from false to true [#7843]
• Breaking: Replace country-regex with country-iso-search to search for country names in choropleth, scattergeo traces [#7856]
  • The vast majority of country names are handled exactly the same with the new library; a small number of legacy entries have been removed
• Breaking: Update minimum required Node version to 22 [#7861]
• Breaking: Change layout.geo.fitbounds default from false to 'locations' [#7895]
  • geo subplots will now auto-fit the initial view to the trace data
  • Set fitbounds: false explicitly to opt out
• Enable scattermap icons to render in color, upgrade Maki icons version to 8.2, and standardize scattermap legend icons to circles [#7825]
• Use plot title as default filename for "Download plot" button [#7828]
• Change signature of plots.graphJson() function to remove mode argument [#7829]
• Upgrade plotly/d3-sankey to 0.12.3. [#7830], with thanks to @adamreeve for the contribution!
• Update plot_config to show the "Upload to Cloud" button by default, and set the default server URL to cloud.plotly.com via [#7909]

Fixed

• Fix histogram autobin size for single-point traces in overlay mode on data updates via Plotly.react [#7507], with thanks to @Lexachoc for the contribution!
• Format tick labels correctly for small numbers in exponential notation [#7768], with thanks to @Hasnaathussain for the contribution!
• Fix crash when ordering categories by value (e.g. sum descending) with null coordinates [#7855]
• Fix scattermap, densitymap traces not showing all points by dynamically computing center, zoom values [#7884, #7913], with thanks to @palmerusaf and @DhruvGarg111 for the contributions!
• Fix GeoJSON bounding-box computation for choropleth and scattergeo traces whose geometry crosses the antimeridian [#7891]
• Snap cartesian axis tick values to multiple of delta so custom tickformat (e.g. "~r") no longer shows floating-point artifacts [#7901], with thanks to @arieleli01212 and @kirthi-b for the contribution!