v4.9.0

Features

• arc marks
  • Examples: Pie, Donut, and Radial Charts

• support datum in encoding for encoding constant data values via scales
  • Examples: Adding rules to highlight certain numeric threshold or date

• add angle channel for point and text marks
  • Example: Windvector Map

• support repeated layers with repeat operator
  • Example: Multi-series Line Chart with Repeated Layers

Other New Examples

• compact trellis grid

• interactive_line_hover

• add Multi-Series Line Chart with Halo

Bug Fixes

• correct repeat child name logic and data precedence (#6141) (8dca856)

• correctly apply axisDiscrete/axisPoint config (#6140) (ebb1348), closes #6139

• don't output axis tickCount if it has values (#6170) (64bf658)

• generate correct axis signals (#6182) (d84f75c)

• make band property correctly work for field with timeUnit (#6187) (e4af450)

• only apply descending stack order for y-stack (#6204) (d319ce4)

• make text marks support multi-line text (#6165) (d0517f0)

• support config.header.labels -- fix #6177 (#6186) (2ac0596)

• let concat use top-level width/height when feasible (#6226) (55e228d), closes #6209

Performance Improvements

• avoid redundant axisConfigType calculation (#6159) (061d300)
• remove vega-scale dependency (#6152) (07a20d0), reducing minified file size by about 50kbs