Sample Gruntfile

Gruntfile.js

module.exports = function(grunt) {

  // Project configuration.
  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    sass: {                  
      dist: {                  
        options: {              
          sourcemap: true,
          style: 'compressed' 
        },
        files: {
          'css/scss/project.noprefix.css': 'css/scss/project.scss'
        }
      }
    },
    autoprefixer: {
      options: {
        // Task-specific options go here.
      },
      single_file: {
        options: {
          map: true
        },
        src: 'css/scss/project.noprefix.css',
        dest: 'css/project.css'
      }
    },
    jshint: {
      all: ['Gruntfile.js', 'js/base.js']
    },
    uglify: {
      my_target: {
        options: {
          sourceMap: true
        },
        files: {
          'js/base.min.js': ['js/base.js']
        }
      }
    },
    watch: {
      styles: {
        files: ['css/scss/*.scss'],
        tasks: ['sass', 'autoprefixer']
      },
      js: {
        files: ['js/base.js'],
        tasks: ['jshint', 'uglify']
      },
      html: {
        files: ['index.html'],
        tasks: []
      },
      options: {
        livereload: true,
      }
    },
    connect: {
      options: {
        port: 9000,
        // Change this to '0.0.0.0' to access the server from outside.
        hostname: 'localhost',
        livereload: 35729
      },
      livereload: {
        options: {
          open: true,
        }
      }
    },
    
    }
  });

  // Load the plugins.
  grunt.loadNpmTasks('grunt-contrib-sass');
  grunt.loadNpmTasks('grunt-contrib-watch');
  grunt.loadNpmTasks('grunt-autoprefixer');
  grunt.loadNpmTasks('grunt-contrib-connect');
  grunt.loadNpmTasks('grunt-contrib-jshint');
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-execute');

  // Default task(s).
  grunt.registerTask('default', ['sass', 'autoprefixer', 'jshint', 'uglify', 'connect:livereload', 'watch']);
  grunt.registerTask('update', ['execute', 'default']);
};