SCSS compilation on save for VS2015 (for scss files under /Content/)

gruntfile.js

/// <binding ProjectOpened='watch' />
module.exports = function (grunt) {
    grunt.initConfig({
        bower: {
            install: {
                options: {
                    targetDir: "lib",
                    layout: "byComponent",
                    cleanTargetDir: false
                }
            }
        },

        sass: {
            targeted: {
                files: {}
            }
        },

        cssmin: {
            targeted: {
                options: {
                    report: "min",
                    sourceMap: true
                },

                files: {}
            }
        },

        watch: {
            sass: {
                files: ["Content/**/*.scss"],
                tasks: ["sass:targeted", "cssmin:targeted"],
                options: {
                    spawn: false
                }
            }
        }
    });

    grunt.registerTask("default", []);

    grunt.loadNpmTasks("grunt-bower-task");

    grunt.loadNpmTasks("grunt-contrib-sass");

    grunt.loadNpmTasks("grunt-contrib-cssmin");

    grunt.loadNpmTasks("grunt-contrib-watch");

    grunt.event.on("watch", function (action, filepath) {
        var cssminFiles = {};
        cssminFiles[filepath.replace(/\.scss$/, ".min.css")] = filepath.replace(/\.scss$/, ".css");

        var sassFiles = {};
        sassFiles[filepath.replace(/\.scss$/, ".css")] = filepath;

        grunt.config("sass.targeted.files", sassFiles);
        grunt.config("cssmin.targeted.files", cssminFiles);
    });
};

package.json

{
  "name": "package",
  "version": "1.0.0",
  "private": true,
  "devDependencies": {
    "grunt": "0.4.5",
    "grunt-bower-task": "0.4.0",
    "grunt-contrib-cssmin": "0.12.3",
    "grunt-contrib-sass": "0.9.2",
    "grunt-contrib-watch": "0.6.1"
  }
}