add unstated package

package.json

@@ -215,6 +215,7 @@
     "terser-webpack-plugin": "^1.2.2",
     "throttle-debounce": "^2.0.0",
     "toastr": "^2.1.2",
+    "unstated": "^2.1.1",
     "webpack": "^4.29.3",
     "webpack-assets-manifest": "^3.1.1",
     "webpack-bundle-analyzer": "^3.0.2",

yarn.lock

@@ -2636,6 +2636,11 @@ create-react-context@<=0.2.2:
     fbjs "^0.8.0"
     gud "^1.0.0"
 
+create-react-context@^0.1.5:
+  version "0.1.6"
+  resolved "https://registry.yarnpkg.com/create-react-context/-/create-react-context-0.1.6.tgz#0f425931d907741127acc6e31acb4f9015dd9fdc"
+  integrity sha512-eCnYYEUEc5i32LHwpE/W7NlddOB9oHwsPaWtWzYtflNkkwa3IfindIcoXdVWs12zCbwaMCavKNu84EXogVIWHw==
+
 create-react-context@^0.2.3:
   version "0.2.3"
   resolved "https://registry.yarnpkg.com/create-react-context/-/create-react-context-0.2.3.tgz#9ec140a6914a22ef04b8b09b7771de89567cb6f3"
@@ -10795,6 +10800,13 @@ unset-value@^1.0.0:
     has-value "^0.3.1"
     isobject "^3.0.0"
 
+unstated@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.yarnpkg.com/unstated/-/unstated-2.1.1.tgz#36b124dfb2e7a12d39d0bb9c46dfb6e51276e3a2"
+  integrity sha512-fORlTWMZxq7NuMJDxyIrrYIZKN7wEWYQ9SiaJfIRcSpsowr6Ph/JIfK2tgtXLW614JfPG/t5q9eEIhXRCf55xg==
+  dependencies:
+    create-react-context "^0.1.5"
+
 unzip-response@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/unzip-response/-/unzip-response-2.0.1.tgz#d2f0f737d16b0615e72a6935ed04214572d56f97"