gulpfile.js

var gulp = require("gulp");
var cleanCSS = require ("gulp-clean-css");
var htmlmin = require ("gulp-htmlmin");
var tinyPNG = require ("gulp-tinypng-compress");

gulp.task("default", defaultTask);

function defaultTask(done) {
    done();
  }

  gulp.task("minify-css", function(done) {
    return gulp.src("./src/css/*.css")
    .pipe(cleanCSS ({
      compatibility: 'ie8'
    }))
    .pipe(gulp.dest("dist/css/"))

    done();
  });

  gulp.task("move-js", function(done) {
    return gulp.src("./src/js/*.js")
    .pipe(gulp.dest("dist/js/"))

    done();
  });

  gulp.task("htmlmin", function(done) {
    return gulp.src("./src/*.html")
    .pipe(htmlmin({ 
      collapseWhitespace: true 
    }))
    .pipe(gulp.dest("dist/"))

    done();
  });

  gulp.task("fonts", function(done) {
    return gulp.src("./src/fonts/**/*")
    .pipe(gulp.dest("dist/fonts"))

    done();
  });

  gulp.task('tinypng', function (done) {
    gulp.src('./src/img/**/*.{png,jpg,jpeg}')
        .pipe(tinyPNG({
            key: 'caVY5tcRKASfWhPaOofeCw9JXdXwBDcj',
        }))
        .pipe(gulp.dest('dist/img/'));

         done();
});