Import a desired SVG in to a Sketch canvas

Import SVG.sketchplugin

// Import Ale's fantastic Sketch Sandbox
// https://github.com/bomberstudios/sketch-sandbox
#import 'sketch-sandbox.js'

// Are we on a page or an artboard?
var page = doc.currentPage();
var canvas = page.currentArtboard() ? page.currentArtboard() : page;

// Define the location of the file you want to import, using file:// protocol
var fileURL = NSURL.URLWithString("file:///Users/johndoe/Downloads/my_cat.svg");

// Set up the SVG Importer
var svgImporter = MSSVGImporter.svgImporter();

// The SVG needs to be imported in to an MSLayerGroup, so let's create one
var containingGroup = canvas.addLayerOfType("group")
    containingGroup.setName("Imported SVG")

// Run the sandbox authorization, and if it succeeds import the desired SVG
new AppSandbox().authorize("/Users/" + NSUserName(), function(){
  MSImportInsert.importFromURL_inGroup_importer_completion(fileURL, containingGroup, svgImporter, nil);
});

Do you know where I can find documentation for MSImportInsert?