# GridUnavailableBehaviour

Fields, allowed values, and APIs that use GridUnavailableBehaviour.

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

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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 GridUnavailableBehaviour = 'fallback' | 'error';
```

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## APIs using this type

- [unavailable](https://grid.syidax.com/docs/options/unavailable.md) — Chooses fallback execution or an error when the requested engine is unavailable.