sketch plugin layer sort

sortLayerOrderByPosition.js

var sketch = require('sketch/dom');
var document = sketch.getSelectedDocument();
var selection = document.selectedLayers.layers.slice();

selection
    .sort((l1, l2) => {
        var l1x = l1.frame.x,
            l1y = l1.frame.y,
            l2x = l2.frame.x,
            l2y = l2.frame.y;
        if (l1y > l2y) return 1;
        if (l1y < l2y) return -1;
        else {
            if (l1x > l2x) return 1;
            if (l1x < l2x) return -1;
            else return 0;
        }
    })
    .forEach(l => l.moveToBack());