## Constraint interface  
**Signature:**  
```typescript
export interface Constraint
```

## Properties  
| Property      | Modifiers | Type    | Description |
| ------------- | --------- | ------- | ----------- |
| [description](/content/docs/sdk/core.constraint.description) |           | string  |             |
| [expression](/content/docs/sdk/core.constraint.expression) |           | string  |             |
| [key](/content/docs/sdk/core.constraint.key)           |           | string  |             |
| [severity](/content/docs/sdk/core.constraint.severity) |           | 'error' \| 'warning' |  |

- [Constraint interface](/content/docs/sdk/core.constraint#constraint-interface/index.html)  
- [Properties](/content/docs/sdk/core.constraint#properties/index.html)