Moved uglify-js from optionalDependencies to peerDependencies

package-lock.json

@@ -1729,7 +1729,8 @@
     "commander": {
       "version": "2.20.3",
       "resolved": "https://registry.npmjs.org/commander/-/commander-2.20.3.tgz",
-      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ=="
+      "integrity": "sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==",
+      "dev": true
     },
     "commondir": {
       "version": "1.0.1",
@@ -10905,7 +10906,7 @@
       "version": "3.8.0",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.8.0.tgz",
       "integrity": "sha512-ugNSTT8ierCsDHso2jkBHXYrU8Y5/fY2ZUprfrJUiD7YpuFvV4jODLFmb3h4btQjqr5Nh4TX4XtgDfCU1WdioQ==",
-      "optional": true,
+      "dev": true,
       "requires": {
         "commander": "~2.20.3",
         "source-map": "~0.6.1"

package.json

@@ -25,7 +25,7 @@
     "source-map": "^0.6.1",
     "yargs": "^15.3.1"
   },
-  "optionalDependencies": {
+  "peerDependencies": {
     "uglify-js": "^3.1.4"
   },
   "devDependencies": {
@@ -69,6 +69,7 @@
     "semver": "^5.0.1",
     "sinon": "^7.5.0",
     "typescript": "^3.4.3",
+    "uglify-js": "^3.1.4",
     "underscore": "^1.5.1",
     "webpack": "^1.12.6",
     "webpack-dev-server": "^1.12.1"