# ValidationRuleType

Fields, allowed values, and APIs that use ValidationRuleType.

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

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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 ValidationRuleType =
  | 'required'
  | 'number'
  | 'integer'
  | 'min'
  | 'max'
  | 'range'
  | 'minLength'
  | 'maxLength'
  | 'pattern'
  | 'oneOf'
  | 'custom';
```

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## Contracts containing this type

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