diff --git a/example/package-lock.json b/example/package-lock.json
index 97b5607..00a5b27 100644
--- a/example/package-lock.json
+++ b/example/package-lock.json
@@ -292,13 +292,13 @@
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-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
-      "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
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       "requires": {
-        "mime-types": "~2.1.18",
-        "negotiator": "0.6.1"
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
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@@ -341,9 +341,9 @@
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-      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.1.0.tgz",
-      "integrity": "sha512-hTv1qPdi+sVEk3jYsdjox5nQI0C9HTbjKShbCdYLKb1LOfNbb7wsF4d7OEKIZoxIHx02tSp3m94jcPW2EfMjmA==",
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.4.tgz",
+      "integrity": "sha512-hHUXGagefjN2iRrID63xckIvotOXOojhQKWIPUZ4mNUZ9nLZW+7FMNoE1lOkEhNWYsx/7ysGIuJYCiMAA9FnrA==",
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@@ -399,9 +399,9 @@
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-      "integrity": "sha1-Qmu52oQJDBg42BLIFQryCoMx4pY=",
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-2.1.2.tgz",
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-      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
-      "dev": true
+      "version": "2.6.3",
+      "resolved": "http://registry.npmjs.org/async/-/async-2.6.3.tgz",
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+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.14"
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+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.15.tgz",
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+        }
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@@ -568,27 +579,33 @@
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-      "integrity": "sha1-WykhmP/dVTs6DyDe0FkrlWlVyLQ=",
+      "version": "1.19.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
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       "dev": true,
       "requires": {
-        "bytes": "3.0.0",
+        "bytes": "3.1.0",
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         "debug": "2.6.9",
         "depd": "~1.1.2",
-        "http-errors": "~1.6.3",
-        "iconv-lite": "0.4.23",
+        "http-errors": "1.7.2",
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-        "qs": "6.5.2",
-        "raw-body": "2.3.3",
-        "type-is": "~1.6.16"
+        "qs": "6.7.0",
+        "raw-body": "2.4.0",
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+          "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
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+          "dev": true
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-          "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.23.tgz",
-          "integrity": "sha512-neyTUVFtahjf0mB3dZT77u+8O0QB89jFdnBkd5P1JgYPbPaia3gXXOVL2fq8VyU2gMMD7SaN7QukTB/pmXYvDA==",
+          "version": "0.4.24",
+          "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
+          "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
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@@ -818,7 +835,7 @@
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+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
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@@ -1088,25 +1105,25 @@
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-      "integrity": "sha512-4aE67DL33dSW9gw4CI2H/yTxqHLNcxp0yS6jB+4h+wr3e43+1z7vm0HU9qXOH8j+qjKuL8+UtkOxYQSMq60Ylw==",
+      "version": "2.0.17",
+      "resolved": "https://registry.npmjs.org/compressible/-/compressible-2.0.17.tgz",
+      "integrity": "sha512-BGHeLCK1GV7j1bSmQQAi26X+GgWcTjLr/0tzSvMCl3LH1w1IJ4PFSPoV5316b30cneTziC+B1a+3OjoSUcQYmw==",
       "dev": true,
       "requires": {
-        "mime-db": ">= 1.36.0 < 2"
+        "mime-db": ">= 1.40.0 < 2"
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-      "version": "1.7.3",
-      "resolved": "https://registry.npmjs.org/compression/-/compression-1.7.3.tgz",
-      "integrity": "sha512-HSjyBG5N1Nnz7tF2+O7A9XUhyjru71/fwgNb7oIsEVHR0WShfs2tIS/EySLgiTe98aOK18YDlMXpzjCXY/n9mg==",
+      "version": "1.7.4",
+      "resolved": "https://registry.npmjs.org/compression/-/compression-1.7.4.tgz",
+      "integrity": "sha512-jaSIDzP9pZVS4ZfQ+TzvtiWhdpFhE2RDHz8QJkpX9SIpLq88VueF5jJw6t+6CUQcAoA6t+x89MLrWAqpfDE8iQ==",
       "dev": true,
       "requires": {
         "accepts": "~1.3.5",
         "bytes": "3.0.0",
-        "compressible": "~2.0.14",
+        "compressible": "~2.0.16",
         "debug": "2.6.9",
-        "on-headers": "~1.0.1",
+        "on-headers": "~1.0.2",
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@@ -1138,9 +1155,9 @@
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-      "integrity": "sha1-sGhzk0vF40T+9hGhlqb6rgruAVo=",
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/connect-history-api-fallback/-/connect-history-api-fallback-1.6.0.tgz",
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@@ -1159,10 +1176,21 @@
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-      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz",
-      "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ=",
-      "dev": true
+      "version": "0.5.3",
+      "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
+      "integrity": "sha512-ExO0774ikEObIAEV9kDo50o+79VCUdEB6n6lzKgGwupcVeRlhrj3qGAfwq8G6uBJjkqLrhT0qEYFcWng8z1z0g==",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "5.1.2"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
+          "dev": true
+        }
+      }
     },
     "content-type": {
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@@ -1171,9 +1199,9 @@
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-      "version": "0.3.1",
-      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.3.1.tgz",
-      "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s=",
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.0.tgz",
+      "integrity": "sha512-+Hp8fLp57wnUSt0tY0tHEXh4voZRDnoIrZPqlo3DPiI4y9lwg/jqx+1Om94/W6ZaPDOUbnjOt/99w66zk+l1Xg==",
       "dev": true
     },
     "cookie-signature": {
@@ -1346,6 +1374,15 @@
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       }
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+    "decamelize": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-2.0.0.tgz",
+      "integrity": "sha512-Ikpp5scV3MSYxY39ymh45ZLEecsTdv/Xj2CaQfI8RLMuwi7XvjX9H/fhraiSuU+C5w5NTDu4ZU72xNiZnurBPg==",
+      "dev": true,
+      "requires": {
+        "xregexp": "4.0.0"
+      }
+    },
     "decode-uri-component": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/decode-uri-component/-/decode-uri-component-0.2.0.tgz",
@@ -1353,10 +1390,18 @@
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-      "integrity": "sha1-9dJgKStmDghO/0zbyfCK0yR0SLU=",
-      "dev": true
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-1.1.0.tgz",
+      "integrity": "sha512-ZbfWJq/wN1Z273o7mUSjILYqehAktR2NVoSrOukDkU9kg2v/Uv89yU4Cvz8seJeAmtN5oqiefKq8FPuXOboqLw==",
+      "dev": true,
+      "requires": {
+        "is-arguments": "^1.0.4",
+        "is-date-object": "^1.0.1",
+        "is-regex": "^1.0.4",
+        "object-is": "^1.0.1",
+        "object-keys": "^1.1.1",
+        "regexp.prototype.flags": "^1.2.0"
+      }
     },
     "default-gateway": {
       "version": "2.7.2",
@@ -1368,6 +1413,15 @@
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       }
     },
+    "define-properties": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/define-properties/-/define-properties-1.1.3.tgz",
+      "integrity": "sha512-3MqfYKj2lLzdMSf8ZIZE/V+Zuy+BgD6f164e8K2w7dgnpKArBDerGYpM46IYYcjnkdPNMjPk9A6VFB8+3SKlXQ==",
+      "dev": true,
+      "requires": {
+        "object-keys": "^1.0.12"
+      }
+    },
     "define-property": {
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       "resolved": "https://registry.npmjs.org/define-property/-/define-property-1.0.0.tgz",
@@ -1601,9 +1655,9 @@
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-      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-3.1.0.tgz",
-      "integrity": "sha512-ivIvhpq/Y0uSjcHDcOIccjmYjGLcP09MFGE7ysAwkAvkXfpZlC985pH2/ui64DKazbTW/4kN3yqozUxlXzI6cA==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-4.0.0.tgz",
+      "integrity": "sha512-qerSRB0p+UDEssxTtm6EDKcE7W4OaoisfIMl4CngyEhjpYglocpNg6UEqCvemdGhosAsg4sO2dXJOdyBifPGCg==",
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@@ -1613,12 +1667,12 @@
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-      "resolved": "https://registry.npmjs.org/eventsource/-/eventsource-0.1.6.tgz",
-      "integrity": "sha1-Cs7ehJ7X3RzMMsgRuxG5RNTykjI=",
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/eventsource/-/eventsource-1.0.7.tgz",
+      "integrity": "sha512-4Ln17+vVT0k8aWq+t/bF5arcS3EpT9gYtW66EPacdj/mAFevznsnyoHLPy2BA8gbIQeIHoPsvwmfBftfcG//BQ==",
       "dev": true,
       "requires": {
-        "original": ">=0.0.5"
+        "original": "^1.0.0"
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@@ -1730,39 +1784,39 @@
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-      "resolved": "https://registry.npmjs.org/express/-/express-4.16.4.tgz",
-      "integrity": "sha512-j12Uuyb4FMrd/qQAm6uCHAkPtO8FDTRJZBDd5D2KOL2eLaz1yUNdUB/NOIyq0iU4q4cFarsUCrnFDPBcnksuOg==",
+      "version": "4.17.1",
+      "resolved": "https://registry.npmjs.org/express/-/express-4.17.1.tgz",
+      "integrity": "sha512-mHJ9O79RqluphRrcw2X/GTh3k9tVv8YcoyY4Kkh4WDMUYKRZUq0h1o0w2rrrxBqM7VoeUVqgb27xlEMXTnYt4g==",
       "dev": true,
       "requires": {
-        "accepts": "~1.3.5",
+        "accepts": "~1.3.7",
         "array-flatten": "1.1.1",
-        "body-parser": "1.18.3",
-        "content-disposition": "0.5.2",
+        "body-parser": "1.19.0",
+        "content-disposition": "0.5.3",
         "content-type": "~1.0.4",
-        "cookie": "0.3.1",
+        "cookie": "0.4.0",
         "cookie-signature": "1.0.6",
         "debug": "2.6.9",
         "depd": "~1.1.2",
         "encodeurl": "~1.0.2",
         "escape-html": "~1.0.3",
         "etag": "~1.8.1",
-        "finalhandler": "1.1.1",
+        "finalhandler": "~1.1.2",
         "fresh": "0.5.2",
         "merge-descriptors": "1.0.1",
         "methods": "~1.1.2",
         "on-finished": "~2.3.0",
-        "parseurl": "~1.3.2",
+        "parseurl": "~1.3.3",
         "path-to-regexp": "0.1.7",
-        "proxy-addr": "~2.0.4",
-        "qs": "6.5.2",
-        "range-parser": "~1.2.0",
+        "proxy-addr": "~2.0.5",
+        "qs": "6.7.0",
+        "range-parser": "~1.2.1",
         "safe-buffer": "5.1.2",
-        "send": "0.16.2",
-        "serve-static": "1.13.2",
-        "setprototypeof": "1.1.0",
-        "statuses": "~1.4.0",
-        "type-is": "~1.6.16",
+        "send": "0.17.1",
+        "serve-static": "1.14.1",
+        "setprototypeof": "1.1.1",
+        "statuses": "~1.5.0",
+        "type-is": "~1.6.18",
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@@ -1870,17 +1924,17 @@
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+      "version": "1.1.2",
+      "resolved": "http://registry.npmjs.org/finalhandler/-/finalhandler-1.1.2.tgz",
+      "integrity": "sha512-aAWcW57uxVNrQZqFXjITpW3sIUQmHGG3qSb9mUah9MgMC4NeWhNOlNjXEYq3HjRAvL6arUviZGGJsBg6z0zsWA==",
       "dev": true,
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         "escape-html": "~1.0.3",
         "on-finished": "~2.3.0",
-        "parseurl": "~1.3.2",
-        "statuses": "~1.4.0",
+        "parseurl": "~1.3.3",
+        "statuses": "~1.5.0",
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@@ -1915,22 +1969,28 @@
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-      "integrity": "sha512-Bh65EZI/RU8nx0wbYF9shkFZlqLP+6WT/5FnA3cE/djNSuKNHJEinGGZgu/cQEkeeb2GdFOgenAmn8qaqYke2w==",
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.9.0.tgz",
+      "integrity": "sha512-CRcPzsSIbXyVDl0QI01muNDu69S8trU4jArW9LpOt2WtC6LyUJetcIrmfHsRBx7/Jb6GHJUiuqyYxPooFfNt6A==",
       "dev": true,
       "requires": {
-        "debug": "=3.1.0"
+        "debug": "^3.0.0"
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       "dependencies": {
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-          "version": "3.1.0",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
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+          "version": "3.2.6",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
+          "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
           "dev": true,
           "requires": {
-            "ms": "2.0.0"
+            "ms": "^2.1.1"
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+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
         }
       }
     },
@@ -2015,7 +2075,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
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@@ -2036,12 +2097,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
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@@ -5466,6 +5763,12 @@
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@@ -5755,12 +6058,12 @@
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@@ -5786,9 +6089,9 @@
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@@ -5956,29 +6259,19 @@
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-        "spdy": "^3.4.1",
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@@ -5988,40 +6281,17 @@
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-            "ajv": "^6.1.0",
-            "ajv-errors": "^1.0.0",
-            "ajv-keywords": "^3.1.0"
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+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
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@@ -6055,12 +6325,13 @@
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-      "integrity": "sha1-DK+dLXVdk67gSdS90NP+LMoqJOs=",
+      "version": "0.7.3",
+      "resolved": "https://registry.npmjs.org/websocket-driver/-/websocket-driver-0.7.3.tgz",
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       "dev": true,
       "requires": {
-        "http-parser-js": ">=0.4.0",
+        "http-parser-js": ">=0.4.0 <0.4.11",
+        "safe-buffer": ">=5.1.0",
         "websocket-extensions": ">=0.1.1"
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@@ -6192,15 +6463,6 @@
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@@ -6221,9 +6483,9 @@
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+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.1.tgz",
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@@ -6239,9 +6501,9 @@
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diff --git a/example/package.json b/example/package.json
index dff5573..cbbacfd 100644
--- a/example/package.json
+++ b/example/package.json
@@ -32,7 +32,7 @@
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     "typescript": "^3.1.3",
     "webpack": "^4.22.0",
-    "webpack-dev-server": "^3.1.9"
+    "webpack-dev-server": "^3.1.11"
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   "dependencies": {
     "ciena-dagre": "^1.0",