Quick grunt-spritesmith config

gruntfile.js

    //..........
    
    sprite: {
      all: {
        src: 'app/images/FILE_PATH_HERE/*.png',
        destImg: 'app/images/spritesheet.png',
        destCSS: 'app/styles/_sprites.scss',
        'padding': 5,
        'cssFormat': 'css',
        // OPTIONAL: Map variable of each sprite
        'cssVarMap': function(sprite) {
          // `sprite` has `name`, `image` (full path), `x`, `y`
          //   `width`, `height`, `total_width`, `total_height`
          // EXAMPLE: Prefix all sprite names with 'sprite-'
          sprite.name = 'sprite-' + sprite.name;
        },

      }
    }
    
    //..........    
    
      grunt.loadNpmTasks('grunt-spritesmith');