Grunt file to compile SASS on the fly

Gruntfile.js

module.exports = function(grunt) {
    grunt.initConfig({

        // Project configuration
        pkg: grunt.file.readJSON('package.json'),

        // Compile Sass
        sass: {
            options: {
                sourceMap: true,
                sourceComments: false
            },
            dist: {
                files: {
                    'css/file.css': 'sass/file.scss'
                }
            }
        },

        // Watch and build
        watch: {
            sass: {
                files: 'public/css/*.scss',
                tasks: ['sass']
            }
        }

    });

    // Load dependencies
    grunt.loadNpmTasks('grunt-contrib-watch');
    grunt.loadNpmTasks('grunt-sass');

    // Run tasks
    grunt.registerTask('default', ['sass']);
};

@kokx