setup.js

// Global Variables to use.
var destFolder, sourceFolder, files, fileType, sourceDoc, svgSaveOpts, doc, layers;

// The folder where all of the Illustrator files are.
sourceFolder = Folder.selectDialog( 'Select the folder with Illustrator files you want to convert to SVG', '~' );

// Function that sets up the exporting process
function init(){

	// Check to see if sourceFolder has any files in it
	if(sourceFolder != null){
		
		// Create new array for files to be stored
		files =  new Array();

		// Only use file types that are illustrator files
		fileType = "*.ai";

		// Files get save with all of the files in the sourceFolder
		files = sourceFolder.getFiles(fileType);

		// Check to see if there are any files in the folder
		if(files.length > 0){

			// Ask for a destination folder
			destFolder = Folder.selectDialog('Select the folder you want to export files to', '~');

			// Loop through files
			for(var i = 0; i < files.length; i++){

				// Save the open file and properties to sourceDoc
				sourceDoc = app.open(files[i])

				doc = app.activeDocument;

				hideAllLayers();
				exportLayers();
				sourceDoc.close(SaveOptions.DONOTSAVECHANGES);
			}
		} else {
			alert('There is nothing here')
		}


	} else {
		alert('There are no files here')
	}

}