Latest working gulpfile config

gulpfile.js

var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    sourcemaps = require('gulp-sourcemaps'),
    prefix = require('gulp-autoprefixer'),
    watch = require('gulp-watch'),
    plumber = require('gulp-plumber'),
    filter = require('gulp-filter'),
    browserSync = require('browser-sync'),
    reload = browserSync.reload;


var path = {
    build: {
        css: 'web/css'
    },
    src: {
        style: 'assets/sass/main.scss'
    },
    watch: {
        style: 'assets/sass/**/*.scss',
        views: 'views/**/*.php'
    }
}

gulp.task('style:build', function() {
    sass(path.src.style, {sourcemap: true})
        .on('error', function(err){
            console.log('Error!', err.message);
        })
        .pipe(prefix("last 2 versions"))
        .pipe(sourcemaps.write('.'))
        .pipe(gulp.dest(path.build.css))
        .pipe(filter('**/*.css'))
        .pipe(reload({stream:true}));
   //gulp.src(path.src.style)
   //    .pipe(sourcemaps.init())
   //    .pipe(sass())
   //    .pipe(prefixer())
   //    .pipe(cssmin())
   //    .pipe(sourcemaps.write())
   //    .pipe(gulp.dest(path.build.css))
});

gulp.task('build', [
    'style:build'
], function(){
    browserSync.init({
        proxy: "http://lk.app:80",
    });
});

gulp.task('watch', function(){
    watch([path.watch.style], function(event, cb) {
        gulp.start('style:build');
    });
    watch([path.watch.views], reload);
});

gulp.task('default', ['build', 'watch']);