Cordova: How to create directory?

/*
############
# Method 1 #
############
*/

// output in android: file:///storage/emulated/0/
var base_url = cordova.file.externalRootDirectory;
// or 
// var base_url = "cdvfile://localhost/persistent/";
var new_directory = 'TEST';

// To Create a sub Directory inside a folder
// var new_directory = 'Sounds/Test';  // Here 'Sounds' is the name of existing parent directory. Parent Directoy must exist to work fine

window.resolveLocalFileSystemURL(base_url, function (fileSystem) {
   
   dir.getDirectory(new_directory, { create: true }, function (file) {
          alert("got the file: "+ file.name + ', ' + file.fullPath);
   });
});

/*
############
# Method 2 #
############
*/

var new_directory = 'TEST';
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, function(fileSystem) {
 fileSystem.root.getDirectory(new_directory, { create: true }, function (file) {
 alert("got the file: "+ file.name + ', ' + file.fullPath);
 });
}, function(error) {
 alert("can't even get the file system: " + error.code);
});

For Documentation Visit: https://www.npmjs.com/package/cordova-plugin-file#android-file-system-layout