Recursively convert ES6 to ES5 using babel with grunt - gruntjs

Question

My grunt file is as follows :
module.exports = function(grunt) {
require('load-grunt-tasks')(grunt);
grunt.initConfig({
pkg: grunt.file.readJSON('package.json'),
clean: {
js: ['src/*.min.js']
},
babel: {
files: {
expand: true,
src: ['src/*.js','src/*/*.js','src/*/*/*.js'],
ext: '-modified.js'
},
options: {
sourceMap: false,
presets: ['babel-preset-es2015']
}
},
watch: {
tasks: ['babel']
}
});
grunt.registerTask('default', ['clean','babel']);
};
Is there a better way to configure "src" this so that it would recursively find out the js file within src folder and subfolders and transpile those file:
src: ['src/*.js','src/*/*.js','src/*/*/*.js']

Answer 1

Those three globbing patterns:
src: ['src/*.js','src/*/*.js','src/*/*/*.js']
...can be replaced with one:
src: ['src/**/*.js']
See the text that reads:
All most people need to know is that foo/*.js will match all files ending with .js in the foo/ subdirectory, but foo/**/*.js will match all files ending with .js in the foo/ subdirectory and all of its subdirectories.
... in the Globbing patterns of the grunt documentation.