dir-glob 
Convert directories to glob compatible strings
Install
$ npm install dir-globUsage
const dirGlob = require('dir-glob');
(async () => {
    console.log(await dirGlob(['index.js', 'test.js', 'fixtures']));
    //=> ['index.js', 'test.js', 'fixtures/**']
    console.log(await dirGlob(['index.js', 'inner_folder'], {cwd: 'fixtures'}));
    //=> ['index.js', 'inner_folder/**']
    console.log(await dirGlob(['lib/**', 'fixtures'], {
        files: ['test', 'unicorn']
        extensions: ['js']
    }));
    //=> ['lib/**', 'fixtures/**/test.js', 'fixtures/**/unicorn.js']
    console.log(await dirGlob(['lib/**', 'fixtures'], {
        files: ['test', 'unicorn', '*.jsx'],
        extensions: ['js', 'png']
    }));
    //=> ['lib/**', 'fixtures/**/test.{js,png}', 'fixtures/**/unicorn.{js,png}', 'fixtures/**/*.jsx']
})();API
dirGlob(input, options?)
Returns a Promise<string[]> with globs.
dirGlob.sync(input, options?)
Returns a string[] with globs.
input
Type: string | string[]
Paths.
options
Type: object
extensions
Type: string[]
Append extensions to the end of your globs.
files
Type: string[]
Only glob for certain files.
cwd
Type: string[]
Test in specific directory.