housekeeping: add extraneous module linting (#4697)

preventative measure!

.eslintrc

@@ -13,11 +13,15 @@
     }
   },
 
-  "extends": ["eslint:recommended", "plugin:react/recommended"],
+  "extends": [
+    "eslint:recommended",
+    "plugin:react/recommended"
+  ],
 
   "plugins": [
     "react",
-    "mocha"
+    "mocha",
+    "import"
   ],
 
   "rules": {
@@ -34,6 +38,7 @@
     "no-console": ["error", { allow: ["warn", "error"] }],
     "react/jsx-no-bind": 1,
     "react/display-name": 0,
-    "mocha/no-exclusive-tests": "error"
+    "mocha/no-exclusive-tests": "error",
+    "import/no-extraneous-dependencies": [2]
   }
 }

package.json

@@ -100,7 +100,7 @@
     "deepmerge": "^2.1.0",
     "enzyme": "^2.7.1",
     "eslint": "^4.1.1",
-    "eslint-plugin-import": "^2.6.0",
+    "eslint-plugin-import": "^2.13.0",
     "eslint-plugin-mocha": "^4.11.0",
     "eslint-plugin-react": "~7.7.0",
     "expect": "^1.20.2",

src/.eslintrc

+{
+  "rules": {
+    "import/no-extraneous-dependencies": [
+      2,
+      {
+        "devDependencies": false
+      }
+    ]
+  }
+}
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