Sample Gruntfile.js file for Yeoman generator.

Gruntfile.js

/**
 * @file Gruntfile
 * @version <%= projectVersion %>
 * @author {@link https://github.com/<%= yourGitHub %> <%= yourName %>}
 */

 module.exports = function (grunt) {
    // Time all the things
    require('time-grunt')(grunt);
    // Load all NPM tasks
    require('load-grunt-tasks')(grunt, {scope: 'devDependencies', pattern: ['assemble', 'grunt-*']});
    // Go!
    grunt.initConfig({
        pkg: grunt.file.readJSON('package.json'),
        bowerrc: grunt.file.readJSON('.bowerrc'),
        meta: {
            banner: '/* <%= _.slugify(projectName) %> :: Latest build: <%%= grunt.template.today(\'dd/mm/yyyy, h:MM:ss TT\') %> */\n'
        },
        config: {
            // Component settings
            bower: '<%%= bowerrc.directory %>',
            // Source settings
            src: 'app/src',
            srcAssets: 'assets',
            srcStyles: 'styles',
            srcSass: 'sass',
            srcScripts: 'scripts',
            srcImages: 'images',
            srcFonts: 'fonts',
            // Dist settings
            dist: 'app/dist',
            distStyles: 'styles',
            distScripts: 'scripts',
            distImages: 'images',
            distFonts: 'fonts',
            distDocs: 'docs',
            distJsDocs: 'jsdocs',
            distSassDocs: 'sassdocs',
            // File settings
            mainCss: 'main.css',
            gruntfile: 'Gruntfile.js',
            // Misc settings
            helpers: 'helpers'
        },

        // Project tasks
        todo: {
          options: {
            colophon: true,
            file: 'TODO.md',
            marks: [{
                    name: 'todo',
                    pattern: /@(todo)/i,
                    color: 'blue'
                }],
                title: '[<%%= pkg.title%> TODO list:](<%= pkg.homepage %>)',
              usePackage: true
          },
          all: [
            '<%%= config.src %>/**/*.{hbs,html,js,scss,txt}',
            '<%%= config.gruntfile %>',
            // Exclude Bower installed components
            '!<%%= config.bower %>'
          ]
        },
        devUpdate: {
          force: {
            options: {
              updateType: 'force',
              reportUpdated: false,
              semver: false,
              packages: {
                dependencies: true,
                devDependencies: true
              },
              packageJson: './package.json'
            }
          }
        }
    });

    // Run setup task after install
    grunt.registerTask('setup', [
        'devUpdate',
        'todo'
    ]);
    // Defaults to dev task
    grunt.registerTask('default', [
        'dev'
    ]);
    // Dev task
    grunt.registerTask('dev', [
    ]);
    // CI build task
    grunt.registerTask('travis', [
    ]);
};