facetStripLabel function

String facetStripLabel(
  1. Object? value,
  2. String? prefix
)

The strip label for a facet value under an optional prefix.

A null value renders as facetNullValuePlaceholder (an em dash) rather than the literal string 'null' — a null value is a valid panel per the spec, so it gets a defined label. Non-null values stringify as before.

Implementation

String facetStripLabel(Object? value, String? prefix) {
  final valuePart = value == null ? facetNullValuePlaceholder : '$value';
  return prefix == null ? valuePart : '$prefix: $valuePart';
}