chore: update to gulp@4

Author: fengkx

dist/js/social-share.min.js

@@ -67,9 +67,9 @@ var clean = function(path, cb) {
   del([path], {force:true}, cb);
 };
 
-gulp.task('css', function(){
+gulp.task('css', function(cb){
   // app css
-  return plugins.sass(vendorFiles.styles.concat(appFiles.styles), {
+  plugins.sass(vendorFiles.styles.concat(appFiles.styles), {
       outputStyle: sassStyle, sourcemap: sourceMap, precision: 2
     })
     // .pipe(plugins.concat('style.min.css'))
@@ -85,6 +85,7 @@ gulp.task('css', function(){
     .pipe(plugins.notify())
     .pipe(plugins.rename({suffix: '.min'}))
     .pipe(gulp.dest(paths.styles.dest));
+    cb()
 });
 
 gulp.task('jquery.share.js', function () {
@@ -113,7 +114,7 @@ gulp.task('fonts', function(){
 });
 
 
-gulp.task('watch', ['css', 'jquery.share.js', 'share.js', 'fonts'], function () {
+gulp.task('watch', gulp.parallel('css', 'jquery.share.js', 'share.js', 'fonts'), function () {
   gulp.watch(appFiles.styles, ['css']).on('change', function (evt) {
     changeEvent(evt);
   });
@@ -123,4 +124,4 @@ gulp.task('watch', ['css', 'jquery.share.js', 'share.js', 'fonts'], function ()
   });
 });
 
-gulp.task('default', ['css', 'jquery.share.js', 'share.js', 'fonts']);
+gulp.task('default', gulp.parallel( 'css', 'jquery.share.js', 'share.js', 'fonts' ));

gulpfile.js

@@ -3,7 +3,6 @@
   "description": "create social share buttons on your site.",
   "version": "1.1.0",
   "main": "dist/js/social-share.min.js",
-  "dependencies": {},
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "dev": "./node_modules/gulp/bin/gulp.js watch",
@@ -33,17 +32,16 @@
   "devDependencies": {
     "del": "*",
     "event-stream": "*",
-    "gulp": "3.9.1",
+    "gulp": "*",
     "gulp-autoprefixer": "*",
-    "gulp-combine-media-queries": "*",
     "gulp-concat": "*",
     "gulp-cssmin": "*",
     "gulp-imagemin": "*",
     "gulp-livereload": "*",
     "gulp-load-plugins": "*",
     "gulp-notify": "*",
     "gulp-rename": "*",
-    "gulp-sass": "^2.3.2",
+    "gulp-sass": "*",
     "gulp-size": "*",
     "gulp-uglify": "*",
     "gulp-util": "*"