Changing text spacing properties about sketchapi

[robintindale]

if you want to use old API calls on a new API object, you need to use sketchObject e.g.

var sketch = context.api();
var document = sketch.selectedDocument
var page = document.selectedPage
var layer = page.newText({alignment: NSTextAlignmentCenter, systemFontSize: 36, text:"Hello World"})
layer.sketchObject.setLineHeight(50)

http://www.sketchplugins.com is the official forum for plugin dev questions, although I guess this issue is also a request to add something to the new API (but there is a lot missing :p)