> For the complete documentation index, see [llms.txt](https://docs.dikesoft.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dikesoft.com/reference/type-guards.md).

# Type Guards

## isDikeGroupColumnDef

```typescript
function isDikeGroupColumnDef(column: DikeColumnDef): column is DikeGroupColumnDef {
    return column instanceof DikeGroupColumnDef;
}
```

## isDikeDataColumnDef\<T, R>

```typescript
function isDikeDataColumnDef<T extends object, R extends string | number | Date | boolean>(column: DikeColumnDef): column is DikeDataColumnDef<T, R> {
    return column instanceof DikeDataColumnDef;
}
```