How to build sourcemap in grunt from less?

Question

css

How to build sourcemap in grunt from less?
I tried it doesn't work)

module.exports = function(grunt) {
  // Project configuration.
  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    less: {
      development: {
        options: {
          paths: ['theme-framework/theme-style/css/less']
        },
        files: {
          'theme-framework/theme-style/css/style.css': 'theme-framework/theme-style/css/less/style.less',
          'theme-framework/theme-style/css/adaptive.css': 'theme-framework/theme-style/css/less/adaptive.less',
          'tribe-events/cmsmasters-framework/theme-style/css/plugin-style.css': 'tribe-events/cmsmasters-framework/theme-style/css/less/plugin-style.less',
          'tribe-events/cmsmasters-framework/theme-style/css/plugin-adaptive.css': 'tribe-events/cmsmasters-framework/theme-style/css/less/plugin-adaptive.less',
          'woocommerce/cmsmasters-framework/theme-style/css/plugin-style.css': 'woocommerce/cmsmasters-framework/theme-style/css/less/plugin-style.less',
          'woocommerce/cmsmasters-framework/theme-style/css/plugin-adaptive.css': 'woocommerce/cmsmasters-framework/theme-style/css/less/plugin-adaptive.less'
        }
      }
    },
    watch: {
      configFiles: {
        files: ['gruntfile.js'],
        options: {
          reload: true
        }
      },
      less: {
        files: ['**/*.less'],
        tasks: ['less']
      },
      livereload: {
        files: ['**/*.css', '**/*.php'],
        options: {
          livereload: true
        }
      }
    },
    jshint: {
      files: ['js/jquery.script.js'],
      options: {
        "curly": true,
        "eqnull": true,
        "eqeqeq": true,
        "undef": true,
        "globals": {
          "jQuery": true,
          "document": true,
          "window": true,
          "screen": true,
          "history": true,
          "navigator": true,
          "cmsms_script": true
        }
      }
    }
  });

  // Load the plugin that provides the "less" task
  grunt.loadNpmTasks('grunt-contrib-less');

  // Load the plugin that provides the "watch" task
  grunt.loadNpmTasks('grunt-contrib-watch');

  // Load the plugin that provides the "jshint" task
  grunt.loadNpmTasks('grunt-contrib-jshint');

  // Default task(s).
  grunt.registerTask('default', ['watch']);
};

Answer 1

How about looking at the docks and for a start at least enable them? :)