doc: instanceof workarounds

docs/src/routes/docs/[...2]api/[...11]header-cell.md

@@ -47,6 +47,26 @@ Returns the [render configuration](./--render.md#renderconfig) of the header cel
 </tr>
 ```
 
+### `isFlat: () => boolean`
+
+Returns `true` if the header cell is an instance of [`FlatHeaderCell`](#flatheadercell).
+
+### `isData: () => boolean`
+
+Returns `true` if the header cell is an instance of [`DataHeaderCell`](#dataheadercell).
+
+### `isFlatDisplay: () => boolean`
+
+Returns `true` if the header cell is an instance of [`FlatDisplayHeaderCell`](#flatdisplayheadercell).
+
+### `isGroup: () => boolean`
+
+Returns `true` if the header cell is an instance of [`GroupHeaderCell`](#groupheadercell).
+
+### `isGroupDisplay: () => boolean`
+
+Returns `true` if the header cell is an instance of [`GroupDisplayHeaderCell`](#groupdisplayheadercell).
+
 <br />
 
 # Variants

docs/src/routes/docs/[...2]api/[...12]body-row.md

@@ -70,6 +70,14 @@ By default, the following plugins can define sub-rows:
 - [addSubRows](../plugins/add-sub-rows.md)
 - [addGroupBy](../plugins/add-group-by.md)
 
+### `isData: () => boolean`
+
+Returns `true` if the body row is an instance of [`DataBodyRow`](#databodyrow).
+
+### `isDisplay: () => boolean`
+
+Returns `true` if the body row is an instance of [`DisplayBodyRow`](#displaybodyrow).
+
 <br/>
 
 # Variants
@@ -86,6 +94,8 @@ By default, the following plugins can define sub-rows:
 
 The original `id` of the data item from the data source.
 
+This can be configured during [`createViewModel`](./create-view-model.md#options-rowdataid-item-index-string).
+
 ### `original: Item`
 
 The original data item from the data source which backs this data row.

docs/src/routes/docs/[...2]api/[...13]body-cell.md

@@ -63,6 +63,15 @@ A constant string that uniquely identifies the body cell in the table.
 
 A constant string that uniquely identifies the data attribute of the body cell in the table.
 
+### `isData: () => boolean`
+
+Returns `true` if the body cell is an instance of [`DataBodyCell`](#databodycell).
+
+### `isDisplay: () => boolean`
+
+Returns `true` if the body cell is an instance of [`DisplayBodyCell`](#displaybodycell).
+
+
 <br/>
 
 # Variants