Substantial refactoring of code structure

yarn.lock

@@ -232,6 +232,14 @@ cookie@0.5.0:
   resolved "https://registry.npmjs.org/cookie/-/cookie-0.5.0.tgz"
   integrity sha512-YZ3GUyn/o8gfKJlnlX7g7xq4gyO6OSuhGPKaaGssGB2qgDUS0gPgtTvoyZLTt9Ab6dC4hfc9dV5arkvc/OCmrw==
 
+cors@^2.8.6:
+  version "2.8.6"
+  resolved "https://registry.yarnpkg.com/cors/-/cors-2.8.6.tgz#ff5dd69bd95e547503820d29aba4f8faf8dfec96"
+  integrity sha512-tJtZBBHA6vjIAaF6EnIaq6laBBP9aq/Y3ouVJjEfoHbRBcHBAHYcMh/w8LDrk2PvIMMq8gmopa5D4V8RmbrxGw==
+  dependencies:
+    object-assign "^4"
+    vary "^1"
+
 debug@2.6.9:
   version "2.6.9"
   resolved "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz"
@@ -576,6 +584,11 @@ no-case@^3.0.4:
     lower-case "^2.0.2"
     tslib "^2.0.3"
 
+object-assign@^4:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
+  integrity sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg==
+
 object-inspect@^1.9.0:
   version "1.12.3"
   resolved "https://registry.npmjs.org/object-inspect/-/object-inspect-1.12.3.tgz"
@@ -794,7 +807,7 @@ utils-merge@1.0.1:
   resolved "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz"
   integrity sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==
 
-vary@~1.1.2:
+vary@^1, vary@~1.1.2:
   version "1.1.2"
   resolved "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz"
   integrity sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==