diff --git a/package-lock.json b/npm-shrinkwrap.json
similarity index 99%
rename from package-lock.json
rename to npm-shrinkwrap.json
index bce6d4794..56d173490 100644
--- a/package-lock.json
+++ b/npm-shrinkwrap.json
@@ -2084,8 +2084,7 @@
             },
             "ansi-regex": {
               "version": "2.1.1",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "aproba": {
               "version": "1.2.0",
@@ -2103,13 +2102,11 @@
             },
             "balanced-match": {
               "version": "1.0.0",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "brace-expansion": {
               "version": "1.1.11",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "balanced-match": "^1.0.0",
                 "concat-map": "0.0.1"
@@ -2122,18 +2119,15 @@
             },
             "code-point-at": {
               "version": "1.1.0",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "concat-map": {
               "version": "0.0.1",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "console-control-strings": {
               "version": "1.1.0",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "core-util-is": {
               "version": "1.0.2",
@@ -2236,8 +2230,7 @@
             },
             "inherits": {
               "version": "2.0.3",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "ini": {
               "version": "1.3.5",
@@ -2247,7 +2240,6 @@
             "is-fullwidth-code-point": {
               "version": "1.0.0",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "number-is-nan": "^1.0.0"
               }
@@ -2260,20 +2252,17 @@
             "minimatch": {
               "version": "3.0.4",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "brace-expansion": "^1.1.7"
               }
             },
             "minimist": {
               "version": "0.0.8",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "minipass": {
               "version": "2.2.4",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "safe-buffer": "^5.1.1",
                 "yallist": "^3.0.0"
@@ -2290,7 +2279,6 @@
             "mkdirp": {
               "version": "0.5.1",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "minimist": "0.0.8"
               }
@@ -2363,8 +2351,7 @@
             },
             "number-is-nan": {
               "version": "1.0.1",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "object-assign": {
               "version": "4.1.1",
@@ -2374,7 +2361,6 @@
             "once": {
               "version": "1.4.0",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "wrappy": "1"
               }
@@ -2450,8 +2436,7 @@
             },
             "safe-buffer": {
               "version": "5.1.1",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "safer-buffer": {
               "version": "2.1.2",
@@ -2481,7 +2466,6 @@
             "string-width": {
               "version": "1.0.2",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "code-point-at": "^1.0.0",
                 "is-fullwidth-code-point": "^1.0.0",
@@ -2499,7 +2483,6 @@
             "strip-ansi": {
               "version": "3.0.1",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "ansi-regex": "^2.0.0"
               }
@@ -2538,13 +2521,11 @@
             },
             "wrappy": {
               "version": "1.0.2",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "yallist": {
               "version": "3.0.2",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             }
           }
         }
@@ -4763,6 +4744,12 @@
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
       "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8="
     },
+    "fsevents": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.0.1.tgz",
+      "integrity": "sha512-p+CXqK/iLvDESUWdn3NA3JVO9HxdfI+iXx8xR3DqWgKZvQNiEVpAyUQo0lmwz8rqksb4xaGerG291xuwwhX2kA==",
+      "optional": true
+    },
     "fstream": {
       "version": "1.0.11",
       "resolved": "https://registry.npmjs.org/fstream/-/fstream-1.0.11.tgz",
diff --git a/package.json b/package.json
index 628331702..31d66d3db 100644
--- a/package.json
+++ b/package.json
@@ -99,6 +99,9 @@
     "wrapper-webpack-plugin": "^2.0.0",
     "yo": "^2.0.5"
   },
+  "optionalDependencies": {
+    "fsevents": "^2.0.1"
+  },
   "scripts": {
     "start": "NODE_ENV=development webpack-dev-server --config webpack/dev.config.js --open",
     "build": "NODE_ENV=production webpack --config webpack/prod.config.js",