Insert a Sketch layer from an absolute path'd file

InsertLayerFromFile.js

// Name of layer to copy
var sourceLayerName = "Card",
	url = NSURL.URLWithString("file:///Users/ryan/Downloads/Test.sketch")

if( true ) {
  var sourceDoc = MSDocument.new()
  if(sourceDoc.readFromURL_ofType_error(url, "com.bohemiancoding.sketch.drawing", nil)) {
    
    var allChildren = sourceDoc.pages().valueForKeyPath("@distinctUnionOfArrays.children")
    
    // Modify the predicate to change search parameters. Here it's by layer name
    var predicate = NSPredicate.predicateWithFormat("name == %@", sourceLayerName);
    
    var layerToCopy = allChildren.filteredArrayUsingPredicate(predicate).firstObject()
    if (layerToCopy) {
      var duplicateLayerToCopy = layerToCopy.duplicate()
      duplicateLayerToCopy.removeFromParent()
      var currentDoc = context.document
      currentDoc.currentPage().currentArtboard().addLayers([duplicateLayerToCopy])
      if(duplicateLayerToCopy.isSymbol()) {
        currentDoc.documentData().layerSymbols().addSymbolWithName_firstInstance(duplicateLayerToCopy.name(), duplicateLayerToCopy)
      }
    }
  }
  sourceDoc.close()
  sourceDoc = nil
}

InsertLayerFromFileUsingTilde.js

// Name of layer to copy
var sourceLayerName = "Card",
    path = @"~/Downloads/Test.sketch",
    path = path.stringByExpandingTildeInPath(),
	url = NSURL.URLWithString(path)


var sourceDoc = MSDocument.new()
if(sourceDoc.readFromURL_ofType_error(url, "com.bohemiancoding.sketch.drawing", nil)) {
  
  var allChildren = sourceDoc.pages().valueForKeyPath("@distinctUnionOfArrays.children")
  
  // Modify the predicate to change search parameters. Here it's by layer name
  var predicate = NSPredicate.predicateWithFormat("name == %@", sourceLayerName);
  
  var layerToCopy = allChildren.filteredArrayUsingPredicate(predicate).firstObject()
  if (layerToCopy) {
    var duplicateLayerToCopy = layerToCopy.duplicate()
    duplicateLayerToCopy.removeFromParent()
    var currentDoc = context.document
    currentDoc.currentPage().currentArtboard().addLayers([duplicateLayerToCopy])
    if(duplicateLayerToCopy.isSymbol()) {
      currentDoc.documentData().layerSymbols().addSymbolWithName_firstInstance(duplicateLayerToCopy.name(), duplicateLayerToCopy)
    }
  }
}
sourceDoc.close()
sourceDoc = nil