diff --git a/package-lock.json b/package-lock.json
index d356fde4..795a8c17 100644
--- a/package-lock.json
+++ b/package-lock.json
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-      "integrity": "sha1-ElX4ej/1frCw4fDmEKi0dIBGya4=",
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-      "requires": {
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-        "builtin-modules": "1.1.1",
-        "chalk": "2.4.0",
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-        "minimatch": "3.0.4",
-        "resolve": "1.6.0",
-        "semver": "5.5.0",
-        "tslib": "1.9.0",
-        "tsutils": "2.25.0"
-      },
-      "dependencies": {
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-          "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.25.0.tgz",
-          "integrity": "sha512-SPgUlOAUAe6fCyPi0QR4U0jRuDsHHKvzIR6/hHd0YR0bb8MzeLJgCagkPSmZeJjWImnpJ0xq6XHa9goTvMBBCQ==",
-          "dev": true,
-          "requires": {
-            "tslib": "1.9.0"
-          }
-        }
-      }
-    },
     "tslint-config-semistandard": {
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       "resolved": "https://registry.npmjs.org/tslint-config-semistandard/-/tslint-config-semistandard-7.0.0.tgz",
@@ -14928,6 +14362,12 @@
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       }
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+    "type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.16.tgz",
@@ -14981,12 +14421,6 @@
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-    "ua-parser-js": {
-      "version": "0.7.17",
-      "resolved": "https://registry.npmjs.org/ua-parser-js/-/ua-parser-js-0.7.17.tgz",
-      "integrity": "sha512-uRdSdu1oA1rncCQL7sCj8vSyZkgtL7faaw9Tc9rZ3mGgraQ7+Pdx7w5mnOSF3gw9ZNG6oc+KXfkon3bKuROm0g==",
-      "dev": true
-    },
     "uglify-js": {
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       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.3.13.tgz",
@@ -16564,12 +15998,6 @@
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       "dev": true
     },
-    "whatwg-fetch": {
-      "version": "2.0.3",
-      "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.3.tgz",
-      "integrity": "sha1-nITsLc9oGH/wC8ZOEnS0QhduHIQ=",
-      "dev": true
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       "resolved": "https://registry.npmjs.org/when/-/when-3.7.8.tgz",
@@ -16649,7 +16077,8 @@
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       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
-      "dev": true
+      "dev": true,
+      "optional": true
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     "worker-farm": {
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@@ -16707,15 +16136,6 @@
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-    "write": {
-      "version": "0.2.1",
-      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
-      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
-      "dev": true,
-      "requires": {
-        "mkdirp": "0.5.1"
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     "write-file-atomic": {
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diff --git a/package.json b/package.json
index 35136c19..3574eb1e 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,7 @@
     "babel-plugin-transform-react-remove-prop-types": "^0.4.13",
     "babel-preset-env": "^1.6.1",
     "babel-register": "^6.26.0",
+    "chai": "^4.1.2",
     "clean-webpack-plugin": "^0.1.19",
     "copy-webpack-plugin": "^4.5.1",
     "css-loader": "^0.28.11",