What is the ** glob character?

I have this path in my react gulpfile:

var path = {
  HTML: 'src/index.html',
  ALL: ['src/js/*.js', 'src/js/**/*.js', 'src/index.html'],
  JS: ['src/js/*.js', 'src/js/**/*.js'],
  MINIFIED_OUT: 'build.min.js',
  DEST_SRC: 'dist/src',
  DEST_BUILD: 'dist/build',
  DEST: 'dist'
};

What is the double glob character?

I know what the single glob is... but what is the double? single glob

It's almost the same as the single asterisk but may consist of multiple directory levels.

In other words, while /x/*/y will match entries like:

/x/a/y
/x/b/y

and so on (with only one directory level in the wildcard section), the double asterisk /x/**/y will also match things like:

/x/any/number/of/levels/y

with the concept of "any number of levels" also including zero (in other words, /x/**/y will match /x/y as one of its choices).

---

As an aside, as much as I hate to credit the mainframe with anything, I believe this has been used since the earlist days of MVS to allow selection of datasets at multiple levels :-)

** matches any character including a forward-slash /
* matches any character except a forward-slash (to match just the file or directory name)

It's usually used to indicate any number of subdirectories. So

src/js/**/*.js

Would match

src/js/files/*.js
src/js/more-files/*.js

etc
etc

> Like Grunt, the double ** is saying, "Look in all the subfolders > within js and for all of the .js files."

You can actually refer here for the same:

https://www.codefellows.org/blog/quick-intro-to-gulp-js