Moving layers with BatchPlay?

Photoshop UXP Plugin API
5

Sure, layer descriptors have a property called itemIndex, that you can get like any other property. You can reference a layer by name (instead of referencing the active layer or a layer by id) via { _ref: 'layer', _name } which u pass to the _target array:

const idx = photoshop.action.batchPlay([
    {
      _obj: 'get',
      _target: [{ _property: 'itemIndex' }, { _ref: 'layer', _name: *name* }],
    },
  ], { synchronousExecution: true })[0]['itemIndex']

Be aware that indices in PS are affected by the document having a background layer or not. To get correct results, you might need to add some logic like here:

image

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