Upgrade Terser to v5 (#15195)

package-lock.json

@@ -5632,9 +5632,10 @@
       }
     },
     "terser": {
-      "version": "4.8.0",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-4.8.0.tgz",
-      "integrity": "sha512-EAPipTNeWsb/3wLPeup1tVPaXfIaU68xMnVdPafIL1TV05OhASArYyIfFvnvJCNrR2NIOvDVNNTFRa+Re2MWyw==",
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-5.0.0.tgz",
+      "integrity": "sha512-olH2DwGINoSuEpSGd+BsPuAQaA3OrHnHnFL/rDB2TVNc3srUbz/rq/j2BlF4zDXI+JqAvGr86bIm1R2cJgZ3FA==",
+      "dev": true,
       "requires": {
         "commander": "^2.20.0",
         "source-map": "~0.6.1",
@@ -5644,7 +5645,8 @@
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
         }
       }
     },

package.json

@@ -19,13 +19,13 @@
     "jszip": "3.5.0",
     "less": "3.12.2",
     "source-map": "0.7.3",
-    "terser": "4.8.0",
     "timeago": "1.6.7",
     "underscore": "1.10.2"
   },
   "devDependencies": {
     "jest": "^26.1.0",
     "jest-date-mock": "^1.0.8",
-    "prettier": "^2.0.5"
+    "prettier": "^2.0.5",
+    "terser": "^5.0.0"
   }
 }