# `extend(...specs)`

Extends the spec shape of the HelixSpec.

### Arguments

| Argument | Type     | Description                                                 |
| -------- | -------- | ----------------------------------------------------------- |
| `specs`  | `object` | Merges the additional objects with the initial spec object. |

### Returns

`HelixSpec`: Return itself.

### Example

To extend the initial spec shape, pass in a new `object` as an argument. Additional `objects` can be passed in as additional arguments.

```js
const Dinosaur = createSpec({
  id: faker.datatype.number(),
  name: faker.name.firstName(),
  location: faker.address.country(),
});

Dinosaur.extend({
  company: "Jurassic Parkland",
  color: faker.commerce.color(),
});

// Dinosaur's spec shape will now be:
// {
//   id: faker.datatype.number(),
//   name: faker.name.firstName(),
//   location: faker.address.country(),
//   company: 'Jurassic Parkland',
//   color: faker.commerce.color()
// }
```