---
title: Design
---
The `Design` named export in FreeSewing's core library is a constructor that
creates new pattern designs.
## Signature
```js
Pattern Design({
array parts,
object data
})
```
## Example
```js
const Sorcha = new Design({
// design configuration here
})
```
This constructor creates a new pattern design.
It takes a single argument, an object holding the design's configuration.
## Design configuration
Since a design's configuration is managed at the part level,
the Design configuration object only requires a `parts` property that should
hold an array of parts to include in the Design.
```js
const Sorcha = new Design({
parts: [front, back, sleeve],
})
```
:::tip
A Design in FreeSewing is little more than a container for various Parts
:::
Optionally, you can also pass it a `data` attribute
to hold any custom data you'd like to add to your Design.
Any `data` you add to the Design constructor will be added
to [the Store](/reference/api/store).
```js
const Sorcha = new Design({
parts: [front, back, sleeve],
data: {
version: 3,
price: 12,
currency: 'euro',
},
})
```
## Notes
The Design constructor is a _super-constructor_.
It will return a constructor method that will a pattern based on your design.
## Properties
In addition to the returned constructor method, an instantiated Design object
also provides the following properties:
### Design.designConfig
This holds the design configuration as passed to the Design constructor.
### Design.patternConfig
Holds the resolved pattern configuration based on the configuration passed to the Design constructor.
