gulpfile.js

var gulp = require("gulp");
var htmlmin = require("gulp-htmlmin");
var concat = require("gulp-concat");
var uglify = require("gulp-uglify");
var cleanCSS = require("gulp-clean-css");

gulp.task("minifyhtml", function(){
  return gulp.src("src/views/*.html")
    .pipe(concat("bundle.html"))
    .pipe(htmlmin({collapseWhitespace: true}))
    .pipe(gulp.dest("static"))
});

gulp.task("minifyjs", function(){
  return gulp.src("src/js/*js")
    .pipe(concat("bundle.js"))
    .pipe(uglify())
    .pipe(gulp.dest("static"))
});

gulp.task("minifycss", function(){
  return gulp.src("src/css/*.css")
    .pipe(concat("bundle.css"))
    .pipe(cleanCSS({compatibility: "ie8"}))
    .pipe(gulp.dest("static"))
});

gulp.task("default", ["minifyhtml", "minifyjs", "minifycss"]);