# GridColumnDefinition

Fields, allowed values, and APIs that use GridColumnDefinition.

Canonical: https://grid.syidax.com/docs/types/GridColumnDefinition/

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## Type definition

A question mark (?) marks an optional field; readonly marks a value you should not change directly. A union (|) accepts one of the listed forms. Functions are callbacks that Grid invokes at the relevant point.

```typescript
export type GridColumnDefinition<
  TData = GridData,
  TContext = unknown,
  TValue = unknown,
> =
  | ColumnDef<TData, TValue, TContext>
  | GridColumnGroupDef<TData, TContext, TValue>;
```

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## Contracts containing this type

- [SyGridApi](https://grid.syidax.com/docs/types/SyGridApi.md)

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## Related types

- [GridData](https://grid.syidax.com/docs/types/GridData.md)
- [ColumnDef](https://grid.syidax.com/docs/types/ColumnDef.md)
- [GridColumnGroupDef](https://grid.syidax.com/docs/types/GridColumnGroupDef.md)