Install serialize-javascript to fix a security issue.

package-lock.json

@@ -11278,9 +11278,9 @@
       }
     },
     "serialize-javascript": {
-      "version": "1.7.0",
-      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-1.7.0.tgz",
-      "integrity": "sha512-ke8UG8ulpFOxO8f8gRYabHQe/ZntKlcig2Mp+8+URDP1D8vJZ0KUt7LYo07q25Z/+JVSgpr/cui9PIp5H6/+nA==",
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-2.1.2.tgz",
+      "integrity": "sha512-rs9OggEUF0V4jUSecXazOYsLfu7OGK2qIn3c7IPBiffz32XniEp/TX9Xmc9LQfK2nQ2QKHvZ2oygKUGU0lG4jQ==",
       "dev": true
     },
     "set-blocking": {
@@ -12425,11 +12425,19 @@
         "find-cache-dir": "2.1.0",
         "is-wsl": "1.1.0",
         "schema-utils": "1.0.0",
-        "serialize-javascript": "1.7.0",
+        "serialize-javascript": "1.9.1",
         "source-map": "0.6.1",
         "uglify-js": "3.6.0",
         "webpack-sources": "1.4.1",
         "worker-farm": "1.7.0"
+      },
+      "dependencies": {
+        "serialize-javascript": {
+          "version": "1.9.1",
+          "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-1.9.1.tgz",
+          "integrity": "sha512-0Vb/54WJ6k5v8sSWN09S0ora+Hnr+cX40r9F170nT+mSkaxltoE/7R3OrIdBSUv1OoiobH1QoWQbCnAO+e8J1A==",
+          "dev": true
+        }
       }
     },
     "unc-path-regex": {

package.json

@@ -40,6 +40,7 @@
     "gulp-uglify": "^3.0.2",
     "jest": "^24.9.0",
     "merge-stream": "^2.0.0",
+    "serialize-javascript": "^2.1.2",
     "uglifyjs-webpack-plugin": "^2.2.0",
     "webpack": "^4.41.2",
     "webpack-stream": "^5.2.1"