Sass gruntfile

Gruntfile.js

module.exports = function(grunt) {
  // Do grunt-related things in here

  // Time how long tasks take. Can help when optimizing build times
  require('time-grunt')(grunt);

  // Load grunt tasks automatically
  require('load-grunt-tasks')(grunt);

  // Project configuration.
  grunt.initConfig({

    pkg: grunt.file.readJSON('package.json'), 

    // Tasks

    // Compiles Sass to CSS and generates necessary files if requested
    sass: {
      options: {
        sourceMap: true,
      },
      dist: {
        files: [{
          expand: true,
          // cwd: '.styles',
          cwd: 'css/',
          src: ['*.{scss,sass}'],
          dest: '.tmp/css',
          ext: '.css'
        }]
      }
    },

    // Add vendor prefixed styles
    autoprefixer: {
      options: {
        browsers: ['> 1%', 'last 2 versions', 'Firefox ESR', 'Opera 12.1', 'iOS > 7', 'ie 8', 'Safari > 6']
      },
      dist: {
        files: [{
          expand: true,
          cwd: '.tmp/css/',
          src: 'main.css',
          dest: 'css/'
        }]
      }
    },

    cssmin: {
      options: {
          banner: '/* <%= pkg.name %> */'
        },
        dist: {
          files: {
            'css/style.css': ['css/main.css']
          }
        }
      },

    watch: {
      styles: {
        files: ['css/main.scss', 'sass/*.scss'],
        tasks: ['sass', 'autoprefixer', 'cssmin'],
        options: {
          spawn: false,
        },
      },
    }    
 

  });


  // Default task(s).
  grunt.registerTask('default', ['sass', 'autoprefixer', 'cssmin']);

};

package.json

{
  "name": "SassDependencies",
  "version": "0.0.1",
  "devDependencies": {
    "grunt": "^0.4.5",
    "grunt-autoprefixer": "^2.0.0",
    "grunt-contrib-cssmin": "^0.10.0",
    "grunt-contrib-nodeunit": "^0.4.1",
    "grunt-contrib-watch": "^0.6.1",
    "grunt-sass": "^0.17.0",
    "load-grunt-tasks": "^1.0.0",
    "time-grunt": "^1.0.0"
  }
}