# HeaderRowContribution

> _Since v2.10.0_

A single header row contributed by a plugin. Sits **above** the leaf
column-header row in the visual / export output.

Each contribution represents **one row**. A plugin needing multiple rows
(e.g. multi-level grouping) returns `HeaderRowContribution[]` from
`handleQuery`; the consumer flattens. Within each row, `cells` MUST
independently sum to `context.columns.length`.

## Properties

| Property | Type | Description |
| -------- | ---- | ----------- |
| `cells` | <code><a href="/grid/api/plugin-development/interfaces/headerrowcell/">HeaderRowCell</a>[]</code> | Cells in this row, in left-to-right column order. |