Fix

gulpfile.ts

@@ -18,10 +18,10 @@ import imagemin = require('gulp-imagemin');
 import * as rename from 'gulp-rename';
 import * as mocha from 'gulp-mocha';
 import * as replace from 'gulp-replace';
-import * as uglifyjs from 'uglify-js';
+const uglifyes = require('uglify-es');
 import version from './src/version';
 
-const uglify = uglifyComposer(uglifyjs, console);
+const uglify = uglifyComposer(uglifyes, console);
 
 const env = process.env.NODE_ENV;
 const isProduction = env === 'production';

package.json

@@ -85,6 +85,7 @@
     "stylus-loader": "3.0.1",
     "swagger-jsdoc": "1.9.4",
     "tslint": "5.3.0",
+    "uglify-es": "3.0.11",
     "uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#harmony",
     "webpack": "2.6.0"
   },