Tighten up global ESLint config

.eslintrc

@@ -1,16 +1,13 @@
 {
-  "extends": ["eslint:recommended", "plugin:import/errors"],
-  "parser": "babel-eslint",
   "env": {
+    "es6": true,
     "node": true
   },
+  "extends": ["eslint:recommended", "plugin:import/errors"],
+  "parser": "babel-eslint",
   "rules": {
     "no-console": 0
   },
-  "globals": {
-    "fetch": true,
-    "Promise": true
-  },
   "settings": {
     "import/resolver": {
       "node": {

modules/utils/cloudflare.js

@@ -1,4 +1,4 @@
-import 'isomorphic-fetch';
+import fetch from 'isomorphic-fetch';
 import invariant from 'invariant';
 import gunzip from 'gunzip-maybe';
 import ndjson from 'ndjson';