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:

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:

import { dimensions } from './shared'

// ...

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