Consider narrowing TreemapConfig to omit irrelevant MarkConfig properties

[kanitw]

Context

TreemapConfig<ES> currently extends MarkConfig<ES> in full (src/mark.ts), inheriting ~35 properties that have no meaning for treemap marks. This is consistent with how all other mark configs (RectConfig, LineConfig, AreaConfig, TickConfig) extend MarkConfig without narrowing, but treemap is arguably a bigger departure from the standard mark model.

Irrelevant inherited properties

• Text: font, fontSize, fontStyle, fontWeight, text, align, baseline, dir, dx, dy, ellipsis, limit, lineBreak, lineHeight, angle
• Arc/polar: startAngle, endAngle, padAngle, theta, theta2, radius, radius2, innerRadius, outerRadius
• Line/area: interpolate, tension, orient, order
• Symbol: shape, size
• Image: aspect, url, smooth
• Other: timeUnitBandPosition, timeUnitBandSize, invalid

Considerations

• No existing mark config narrows MarkConfig — this would set a new pattern
• MarkDef uses an intersection of all mark configs including TreemapConfig; narrowing would need compatibility checks
• AnyMarkConfig is a union that includes TreemapConfig
• The extra properties are harmless at runtime (ignored by the treemap compiler)
• Could use Omit (exclude irrelevant) or Pick (include only relevant)

Suggested approach

Use Omit to remove clearly irrelevant categories. This is less maintenance than Pick and still removes the bulk of nonsensical props from the schema/autocomplete.