Merge pull request #3290 from mozilla/eslint-please

task(monorepo): eslint consolidation

Author: Dave Justice

.circleci/test-content-server.sh

@@ -33,7 +33,7 @@ function test_suite() {
 }
 
 if grep -e "$MODULE" -e 'all' $DIR/../packages/test.list; then
-  node_modules/.bin/grunt eslint
+  npm run lint
 
   cd ../../
   npx pm2 start circleci_servers.json

.eslintrc

@@ -0,0 +1,7 @@
+{
+  "extends": ["plugin:fxa/recommended"],
+  "plugins": ["fxa"],
+  "rules": {
+    "space-unary-ops": "off"
+  }
+}