Basic SCSS compiling / JS linting Gruntfile. `grunt` or `grunt watch` for development. `grunt build` will compress css ouput.

Gruntfile.js

module.exports = function(grunt) {
    
    grunt.initConfig({
      pkg: grunt.file.readJSON('package.json'),
      sass: {
        dist: {
          options: {
            style: 'compressed'
          },
          files: {
            './css/screen.css' : './src/scss/screen.scss'
          }
        },
        dev : {
          options: {
            style: 'nested'
          },
          files: {
            './css/screen.css' : './src/scss/screen.scss'
          }
        }
      },
      jshint: {
        options: {
          browser: true,
          '-W030': true,
          globals: {
            jQuery: true
          },
        },
        all: ['./src/js/**/*.js', 'Gruntfile.js']
      },
      watch : {
        options: {
            livereload: true,
        },
        twig: {
          files: ['views/**/*.twig']
        },
        scss: {
          files: ['**/*.scss'],
          tasks: ['sass:dev']
        },
        scripts: {
          files: ['./js/**/*.js', 'Gruntfile.js'],
          tasks: ['jshint']
        }
      }
    });

    grunt.loadNpmTasks('grunt-contrib-sass');
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.loadNpmTasks('grunt-contrib-jshint');
  
    grunt.registerTask('default', ['watch']);
    grunt.registerTask('build', ['sass:dist']);

  
};