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node.jsgruntjsyeomanyeoman-generator

What does `{,*/}` mean in paths of Gruntfile.js?

In Gruntfile.js, I have got:

watch: {
    styles: {
      files: [
        '<%= yeoman.app %>/styles/{,*/}*.less'
      ],
      tasks: ['copy:styles', 'autoprefixer']
    }
}

For the path, what does {,*/} mean indeed? How does it differ to using double asterisks **/?

Solution

  • This pattern is widely used in yeoman templates: it means to look only one level deep inside folder hierarchy. It is used mostly for performance reasons since watching too many files simultaneously can be slow (or even impossible).