dir-glob

$ npm install dir-glob

const dirGlob = require('dir-glob');

dirGlob(['index.js', 'test.js', 'fixtures']).then(files => {
	console.log(files);
	//=> ['index.js', 'test.js', 'fixtures/**']
});

dirGlob(['index.js', 'inner_folder'], {
	cwd: 'fixtures'
}).then(files => {
	console.log(files);
	//=> ['index.js', 'inner_folder/**']
});

dirGlob(['lib/**', 'fixtures'], {
	files: ['test', 'unicorn']
	extensions: ['js']
}).then(files => {
	console.log(files);
	//=> ['lib/**', 'fixtures/**/test.js', 'fixtures/**/unicorn.js']
});

dirGlob(['lib/**', 'fixtures'], {
	files: ['test', 'unicorn', '*.jsx'],
	extensions: ['js', 'png']
}).then(files => {
	console.log(files);
	//=> ['lib/**', 'fixtures/**/test.{js,png}', 'fixtures/**/unicorn.{js,png}', 'fixtures/**/*.jsx']
});