Example grunt setup

gruntfile.js

'use strict';
module.exports = function(grunt) {

  // load all grunt tasks
  require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);

  grunt.initConfig({

      // watch for changes and trigger compass, jshint, uglify and livereload
      watch: {
        styles: {
          files: ['src/styles/*.less'],
          tasks: ['less']
        },
        js: {
          files: ['src/scripts/*.js'],
          tasks: ['jshint', 'uglify']
        },
        livereload: {
          files: ['dest/assets/**'],
          options: {
            livereload: true
          }
        }
      },

      // javascript linting with jshint
      jshint: {
        options: {
          jshintrc: '.jshintrc',
          "force": true
        },
        all: [
          'Gruntfile.js',
          'src/js/*.js'
        ]
      },

      // less compiling
      less: {
        development: {
          options: {
            compress: true,
            cleancss: true,
            sourceMap: true,
            sourceMapFilename: 'assets/styles/main.css.map',
            sourceMapRootpath: '/sites/all/themes/oswego' //for drupal themes
          },
          files: {
            "assets/styles/main.css": "dev/styles/main.less"
          }
        }
      },

      // uglify to concat, minify, and make source maps
      uglify: {
        options: {
          beautify: false,
          mangle: false
        },
        scripts: {
          files: {
            'dest/assets/scripts/script.min.js': [
              'src/scripts/*.js'
              
            ]
          }
        }
      }

      // image optimization
      // imagemin: {
      //   dist: {
      //     options: {
      //       optimizationLevel: 7,
      //       progressive: true
      //     },
      //     files: [{
      //       expand: true,
      //       cwd: 'assets/images/',
      //       src: '**/*',
      //       dest: 'assets/images/'
      //     }]
      //   }
      // },

      // deploy via rsync
      // deploy: {
      //     staging: {
      //         src: "./",
      //         dest: "~/path/to/theme",
      //         host: "user@host.com",
      //         recursive: true,
      //         syncDest: true,
      //         exclude: ['.git*', 'node_modules', '.sass-cache', 'Gruntfile.js', 'package.json', '.DS_Store', 'README.md', 'config.rb', '.jshintrc']
      //     },
      //     production: {
      //         src: "./",
      //         dest: "~/path/to/theme",
      //         host: "user@host.com",
      //         recursive: true,
      //         syncDest: true,
      //         exclude: '<%= rsync.staging.exclude %>'
      //     }
      // }

  });

  // rename tasks
  grunt.renameTask('rsync', 'deploy');

  // register task
  grunt.registerTask('build', ['jshint', 'uglify', 'less']);
  grunt.registerTask('default', ['build', 'watch']);

};

package.json

{
  "name": "project-name",
  "version": "0.0.0",
  "dependencies": {},
  "devDependencies": {
    "grunt-contrib-copy": "^0.5.0",
    "grunt-contrib-jshint": "^0.10.0",
    "grunt-contrib-less": "^0.11.0",
    "grunt-contrib-uglify": "^0.4.0",
    "grunt-contrib-watch": "^0.6.1",
    "grunt-rsync": "^0.5.0",
    "matchdep": "^0.3.0"
  },
  "engines": {
    "node": ">=0.10.28"
  }
}