prettier 2

Summary:
Quick notes:

- This looks worse than it is. It adds mandatory parentheses to single argument lambdas. Lots of outrage on Twitter about it, personally I'm {emoji:1f937_200d_2642} about it.
- Space before function, e.g. `a = function ()` is now enforced. I like this because both were fine before.
- I added `eslint-config-prettier` to the config because otherwise a ton of rules conflict with eslint itself.

Close https://github.com/facebook/flipper/pull/915

Reviewed By: jknoxville

Differential Revision: D20594929

fbshipit-source-id: ca1c65376b90e009550dd6d1f4e0831d32cbff03

desktop/static/transforms/fb-stubs.js

@@ -12,12 +12,12 @@ const path = require('path');
 const replaceFBStubs = fs.existsSync(
   path.join(__dirname, '..', '..', 'app', 'src', 'fb'),
 );
-const isFBFile = filePath => filePath.includes(`${path.sep}fb${path.sep}`);
+const isFBFile = (filePath) => filePath.includes(`${path.sep}fb${path.sep}`);
 
 const requireFromFolder = (folder, path) =>
   new RegExp(folder + '/[A-Za-z0-9.-_]+(.js)?$', 'g').test(path);
 
-module.exports = function(babel) {
+module.exports = function (babel) {
   return {
     name: 'replace-dynamic-requires',
     visitor: {