Select filtered layers in Sketch

sketch-select-filtered-layers.js

// run this code in Sketch's script window (Plugins > Run Script...)
// tested in Sketch 57

context.document.currentPage().changeSelectionBySelectingLayers(nil);
let children = context.document.currentPage().children().objectEnumerator(), layer;
while(layer = children.nextObject()) {
    layer.select_byExtendingSelection(context.document.sidebarController().filterViewController().filter().shouldIncludeNode(layer), true);
}