Merge pull request #5311 from gijzelaerr/fix-gulp-issue

Replace gulp minify with gulp clean (fixes #5310)

Author: jmcrawford45

gulp/build.js

@@ -1,7 +1,7 @@
 'use strict';
 
 var gulp = require('gulp'),
-  minifycss = require('gulp-minify-css'),
+  cleanCSS = require('gulp-clean-css'),
   concat = require('gulp-concat'),
   less = require('gulp-less'),
   gulpif = require('gulp-if'),
@@ -127,7 +127,7 @@ gulp.task('dev:styles', function () {
     })))
     .pipe(plumber())
     .pipe(concat('styles.css'))
-    .pipe(minifycss())
+    .pipe(cleanCSS())
     .pipe(autoprefixer('last 1 version'))
     .pipe(gulp.dest('.tmp/styles'))
     .pipe(size());

lemur/static/app/images/.bogus

@@ -60,7 +60,8 @@
     "test": "gulp test"
   },
   "devDependencies": {
-    "gulp": "^4.0.2",
+    "gulp": "^5.0.1",
+    "gulp-clean-css": "^4.3.0",
     "gulp-util": "^3.0.8",
     "jshint": "^2.11.0",
     "karma-chrome-launcher": "^3.1.0"