Upgrade to gulp 4 and update others gulp plugins (#41)

.travis.yml

@@ -2,19 +2,15 @@
 # in this file, please see the Travis CI documentation:
 # https://docs.travis-ci.com
 
-before_script:
-  - npm install -g gulp-cli
-script: gulp
-
 git:
   depth: 10
 
 language: node_js
 
 node_js:
-  - 6
   - 8
   - 9
+  - 10
 
 dist: trusty
 sudo: false

gulpfile.babel.js

@@ -1,39 +1,50 @@
 import gulp from 'gulp';
-import pkg from './package.json';
-import header from 'gulp-header';
-import cssimport from 'gulp-cssimport';
-import del from 'del';
 import plugins from 'gulp-load-plugins';
+import del from 'del';
+
+import pkg from './package.json';
 
 const license = `/* ${pkg.name} ${pkg.version} | ${pkg.license} License | ${pkg.homepage} */\n`;
 
-const src = './src/';
+const src = './src';
 const dist = './dist/';
-const main = 'main.css';
 let files = [
   `${src}/_base.css`,
   `${src}/_helpers.css`,
   `${src}/_mqs.css`,
   `${src}/_print.css`
 ];
 
-
 gulp.task('concat', () => {
-  gulp.src(src + main)
-    .pipe(cssimport())
-    .pipe(header(license))
+  return gulp.src(`${src}/main.css`)
+    .pipe(plugins().cssimport())
+    .pipe(plugins().header(license))
     .pipe(plugins().autoprefixer({
       cascade: false
     }))
     .pipe(gulp.dest(dist));
 });
+
 gulp.task('copy', () => {
-  gulp.src(files,{})
-    .pipe(header(license))
+  return gulp.src(files, {})
+    .pipe(plugins().header(license))
     .pipe(gulp.dest(dist));
 });
-gulp.task('clean', () => {
-  del([dist]);
+
+gulp.task('clean', (done) => {
+  del([
+    dist
+  ]).then(() => {
+    done();
+  });
 });
 
-gulp.task('default',['copy','concat']);
+gulp.task(
+  'build',
+  gulp.series(
+    'clean',
+    gulp.parallel('copy', 'concat')
+  )
+);
+
+gulp.task('default', gulp.series('build'));

package.json

@@ -4,6 +4,7 @@
   "description": "The main.css file from HTML5 Boilerplate",
   "main": "index.js",
   "scripts": {
+    "build": "gulp build",
     "lint:js": "eslint .",
     "test": "npm run lint:js"
   },
@@ -29,11 +30,11 @@
     "babel-preset-env": "^1.7.0",
     "del": "^4.1.1",
     "eslint": "^6.0.1",
-    "gulp": "^3.9.1",
-    "gulp-autoprefixer": "^6.1.0",
+    "gulp": "^4.0.2",
+    "gulp-autoprefixer": "^7.0.0",
     "gulp-cssimport": "^7.0.0",
-    "gulp-header": "^2.0.7",
-    "gulp-load-plugins": "^1.6.0",
+    "gulp-header": "^2.0.9",
+    "gulp-load-plugins": "^2.0.1",
     "stylelint": "^10.1.0",
     "stylelint-config-recommended": "^2.2.0"
   },