HeaderRowCell

Since v2.10.0

Single cell in a contributed header row. span is the number of leaf columns this cell covers (always >= 1). The sum of span across all cells in a row MUST equal context.columns.length.

label === '' is treated as a blank/dropped cell — consumers may still emit it (to preserve span alignment) or skip the entire row if every cell is blank.

Properties

Property	Type	Description
label	string	Display label for this cell. Empty string = blank cell (span preserved).
span	number	Number of leaf columns covered. Always >= 1.
source?	string	Optional plugin name (for debugging / processHeaderRow filtering).
meta?	unknown	Optional opaque payload for consumers that need plugin-specific data.