Add eslint rules for cypress

.eslintrc

@@ -10,7 +10,8 @@
     },
     "env": {
         "browser": true,
-        "jest": true
+        "jest": true,
+        "cypress/globals": true
     },
     "rules": {
         "import/prefer-default-export": 0,
@@ -32,13 +33,17 @@
         "new-cap": 0,
         "max-len": 0,
         "eol-last": 0,
-        "spaced-comment": 0
+        "spaced-comment": 0,
+        "no-unused-expressions": 0,
+        "chai-friendly/no-unused-expressions": 2
     },
     "plugins": [
         "import",
         "react",
         "jest",
-        "flowtype"
+        "flowtype",
+        "cypress",
+        "chai-friendly"
     ],
     "settings": {
         "import/resolver": {

package.json

@@ -98,6 +98,8 @@
         "eslint-config-airbnb": "^17.0.0",
         "eslint-import-resolver-babel-module": "^4.0.0",
         "eslint-loader": "^2.1.0",
+        "eslint-plugin-chai-friendly": "^0.4.1",
+        "eslint-plugin-cypress": "^2.2.0",
         "eslint-plugin-flowtype": "^2.50.0",
         "eslint-plugin-import": "^2.14.0",
         "eslint-plugin-jest": "^21.18.0",

yarn.lock

@@ -3701,6 +3701,18 @@ eslint-module-utils@^2.2.0:
     debug "^2.6.8"
     pkg-dir "^1.0.0"
 
+eslint-plugin-chai-friendly@^0.4.1:
+  version "0.4.1"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-chai-friendly/-/eslint-plugin-chai-friendly-0.4.1.tgz#9eeb17f92277ba80bb64f0e946c6936a3ae707b4"
+  integrity sha512-hkpLN7VVoGGsofZjUhcQ+sufC3FgqMJwD0DvAcRfxY1tVRyQyVsqpaKnToPHJQOrRo0FQ0fSEDwW2gr4rsNdGA==
+
+eslint-plugin-cypress@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-cypress/-/eslint-plugin-cypress-2.2.0.tgz#31f23bec82eb4078711b374af66af3daa9fdbd2e"
+  integrity sha512-Xk1DMXPfnSChpNhQPw8E9lfRUse9nSyPccxMbKlOuwCmTm2fhyNQWfulDr9DDgUL1Xetdub5lnYQkKniHjNbYw==
+  dependencies:
+    globals "^11.0.1"
+
 eslint-plugin-flowtype@^2.50.0:
   version "2.50.0"
   resolved "https://registry.yarnpkg.com/eslint-plugin-flowtype/-/eslint-plugin-flowtype-2.50.0.tgz#953e262fa9b5d0fa76e178604892cf60dfb916da"