# hitTestDie

Wafer map: die under a component-local CSS point (`null` off-die or on other types).

Canonical: https://chart.syidax.com/docs/methods/hitTestDie/

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## Definition

```typescript
hitTestDie(cssX: number, cssY: number): Promise<unknown | null>
```

| Arguments | Type | Required |
| --- | --- | --- |
| `cssX` | `number` | Required |
| `cssY` | `number` | Required |

Return type: `Promise<unknown | null>`. Call the method after element registration and await its Promise result.

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## Related charts

- [sy-wafer-map](https://chart.syidax.com/docs/components/wafer-map.md#method-hitTestDie)