chore(gulp): update to gulp 4

Author: saveman71

gulpfile.js

@@ -12,22 +12,22 @@ var standard = require('gulp-standard')
 
 var karmaConfig = path.join(__dirname, 'karma.conf.js')
 
-gulp.task('clean', function () {
+gulp.task('clean', function clean () {
   var del = require('del')
   return del([
     'build'
   ])
 })
 
-gulp.task('complexity', function (done) {
+gulp.task('complexity', function complexity (done) {
   var callback = function () {
     done()
   }
 
   plato.inspect(paths.lint, 'build/complexity', {title: 'prerender', recurse: true}, callback)
 })
 
-gulp.task('lint', function () {
+gulp.task('lint', function lint () {
   return gulp
     .src(paths.lint)
     .pipe(standard())
@@ -37,8 +37,8 @@ gulp.task('lint', function () {
     }))
 })
 
-gulp.task('tdd', function (done) {
-  gulp.watch(paths.all, ['lint'])
+gulp.task('tdd', function tdd (done) {
+  gulp.watch(paths.all, gulp.parallel('lint'))
 
   var config = testConfig(
     {
@@ -53,7 +53,7 @@ gulp.task('tdd', function (done) {
   server.start()
 })
 
-gulp.task('test', ['lint'], function (done) {
+gulp.task('test', gulp.series('lint', function test (done) {
   var config = testConfig(
     {
       configFile: karmaConfig,
@@ -64,9 +64,9 @@ gulp.task('test', ['lint'], function (done) {
 
   var server = new Server(config, done)
   server.start()
-})
+}))
 
-gulp.task('default', ['complexity', 'test'])
+gulp.task('default', gulp.parallel('complexity', 'test'))
 
 var testConfig = function (options) {
   var travisDefaultOptions = {

package.json

@@ -24,7 +24,7 @@
     "cz-conventional-changelog": "^1.2.0",
     "del": "^5.1.0",
     "eslint": "^3.8.1",
-    "gulp": "^3.9.1",
+    "gulp": "^4.0.0",
     "gulp-standard": "^8.0.4",
     "jasmine-core": "^2.5.2",
     "jquery": "^3.1.1",