Gruntfile.js

module.exports = function(grunt) {
 
  // Project configuration.
  grunt.initConfig({
    pkg: grunt.file.readJSON('package.json'),
    uglify: {
      options: {
        banner: '/*! <%= pkg.name %> <%= grunt.template.today("yyyy-mm-dd") %> */\n'
      },
      build: {
        src: 'src/<%= pkg.name %>.js',
        dest: 'build/<%= pkg.name %>.min.js'
      }
    },
    less: {
      options: {
        paths: ['css']
      },
      // target name
      src: {
      // no need for files, the config below should work
        expand: true,
        cwd: 'less',
        src: '*.less',
        dest: 'build',
        ext: '.css'
      }
    },
    lint_pattern: {
      options: {
        rules: [
          {
            pattern: /rudeWord/,
            message: 'Profanity is not allowed.'
          },
        ],
      },
      files: [
        'src/**.js',
        'less/**.less'
      ]
    }
  });
 
  // Load the plugins that we need.
  grunt.loadNpmTasks('grunt-contrib-uglify');
  grunt.loadNpmTasks('grunt-contrib-less');
  grunt.loadNpmTasks('grunt-lint-pattern');
 
  // Default task(s).
  grunt.registerTask('default', ['lint_pattern', 'uglify','less']);
};