freesewing/sites/dev/docs/howtos/code/shared-dimensions/readme.mdx

---
title: Share dimensions between pattern parts
---

When you have different pattern parts that look similar -- like the front
and back of a garment -- you may find that there's a lot of dimensions
shared between them.

The example below is from Aaron where dimensions are shared between
the back and front part.

Aaron has a file called `shared.mjs` that looks like this:

```js
export function dimensions(macro, points, sa) {
  macro('hd', {
    from: points.cfHem,
    to: points.hem,
    y: points.hem.y + sa * 2.5 + 15
  })
  // more dimensions here
}
```

In both `front.mjs` and `back.mjs` we use this code to add these shared
dimensions:

```js
import { dimensions } from './shared'

// ...

  if (paperless) {
    dimensions(macro, points, sa)
    // ... dimensions specific to this part
  }
```