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[Home](./index.md) &gt; [@empathyco/x-components](./x-components.md) &gt; [SubObject](./x-components.subobject.md)

## SubObject type

Extracts a sub-type with the properties of `SomeObject` that have the `TargetPropertyType` type.

**Signature:**

```typescript
export type SubObject<SomeObject, TargetPropertyType> = {
    [Key in keyof SomeObject as SomeObject[Key] extends TargetPropertyType ? Key : never]: TargetPropertyType & SomeObject[Key];
};
```

## Example


```typescript
  interface Person {
    name: string,
    surname: string,
    age: number
  }

 type StringPersonProperties = SubObject<Person, string>; // { name: string; surname: string; };
```